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authorerikjohnston <erikjohnston@users.noreply.github.com>2022-06-28 12:15:27 +0000
committererikjohnston <erikjohnston@users.noreply.github.com>2022-06-28 12:15:27 +0000
commit2044f365c8845b369ae26b880d4c1e5e862c0ee5 (patch)
treeca2f20406664f778e70824ed485726dc4b1bec3e /v1.62/usage
parentdeploy: 3ceaf1462d90281c31dc64d79fb35b0def30150a (diff)
downloadsynapse-2044f365c8845b369ae26b880d4c1e5e862c0ee5.tar.xz
deploy: 7469824d5838577f5a07aec6ab73b457459d8b4a
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+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>Background Updates - Synapse</title>
+        <!-- Custom HTML head -->
+        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
+        <meta name="description" content="">
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <meta name="theme-color" content="#ffffff" />
+
+        <link rel="icon" href="../../../favicon.svg">
+        <link rel="shortcut icon" href="../../../favicon.png">
+        <link rel="stylesheet" href="../../../css/variables.css">
+        <link rel="stylesheet" href="../../../css/general.css">
+        <link rel="stylesheet" href="../../../css/chrome.css">
+        <link rel="stylesheet" href="../../../css/print.css" media="print">
+        <!-- Fonts -->
+        <link rel="stylesheet" href="../../../FontAwesome/css/font-awesome.css">
+        <link rel="stylesheet" href="../../../fonts/fonts.css">
+        <!-- Highlight.js Stylesheets -->
+        <link rel="stylesheet" href="../../../highlight.css">
+        <link rel="stylesheet" href="../../../tomorrow-night.css">
+        <link rel="stylesheet" href="../../../ayu-highlight.css">
+
+        <!-- Custom theme stylesheets -->
+        <link rel="stylesheet" href="../../../docs/website_files/table-of-contents.css">
+        <link rel="stylesheet" href="../../../docs/website_files/remove-nav-buttons.css">
+        <link rel="stylesheet" href="../../../docs/website_files/indent-section-headers.css">
+    </head>
+    <body>
+        <!-- Provide site root to javascript -->
+        <script type="text/javascript">
+            var path_to_root = "../../../";
+            var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light";
+        </script>
+
+        <!-- Work around some values being stored in localStorage wrapped in quotes -->
+        <script type="text/javascript">
+            try {
+                var theme = localStorage.getItem('mdbook-theme');
+                var sidebar = localStorage.getItem('mdbook-sidebar');
+                if (theme.startsWith('"') && theme.endsWith('"')) {
+                    localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
+                }
+                if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
+                    localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
+                }
+            } catch (e) { }
+        </script>
+
+        <!-- Set the theme before any content is loaded, prevents flash -->
+        <script type="text/javascript">
+            var theme;
+            try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
+            if (theme === null || theme === undefined) { theme = default_theme; }
+            var html = document.querySelector('html');
+            html.classList.remove('no-js')
+            html.classList.remove('light')
+            html.classList.add(theme);
+            html.classList.add('js');
+        </script>
+
+        <!-- Hide / unhide sidebar before it is displayed -->
+        <script type="text/javascript">
+            var html = document.querySelector('html');
+            var sidebar = 'hidden';
+            if (document.body.clientWidth >= 1080) {
+                try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
+                sidebar = sidebar || 'visible';
+            }
+            html.classList.remove('sidebar-visible');
+            html.classList.add("sidebar-" + sidebar);
+        </script>
+
+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div class="sidebar-scrollbox">
+                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="../../../welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="../../../setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="../../../postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="../../../reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="../../../setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="../../../turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="../../../delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a href="../../../upgrade.html">Upgrading between Synapse Versions</a></li><li class="chapter-item expanded affix "><li class="part-title">Usage</li><li class="chapter-item expanded "><a href="../../../federate.html">Federation</a></li><li class="chapter-item expanded "><a href="../../../usage/configuration/index.html">Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../usage/configuration/config_documentation.html">Configuration Manual</a></li><li class="chapter-item expanded "><a href="../../../usage/configuration/homeserver_sample_config.html">Homeserver Sample Config File</a></li><li class="chapter-item expanded "><a href="../../../usage/configuration/logging_sample_config.html">Logging Sample Config File</a></li><li class="chapter-item expanded "><a href="../../../structured_logging.html">Structured Logging</a></li><li class="chapter-item expanded "><a href="../../../templates.html">Templates</a></li><li class="chapter-item expanded "><a href="../../../usage/configuration/user_authentication/index.html">User Authentication</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../usage/configuration/user_authentication/single_sign_on/index.html">Single-Sign On</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../openid.html">OpenID Connect</a></li><li class="chapter-item expanded "><a href="../../../usage/configuration/user_authentication/single_sign_on/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="../../../usage/configuration/user_authentication/single_sign_on/cas.html">CAS</a></li><li class="chapter-item expanded "><a href="../../../sso_mapping_providers.html">SSO Mapping Providers</a></li></ol></li><li class="chapter-item expanded "><a href="../../../password_auth_providers.html">Password Auth Providers</a></li><li class="chapter-item expanded "><a href="../../../jwt.html">JSON Web Tokens</a></li><li class="chapter-item expanded "><a href="../../../usage/configuration/user_authentication/refresh_tokens.html">Refresh Tokens</a></li></ol></li><li class="chapter-item expanded "><a href="../../../CAPTCHA_SETUP.html">Registration Captcha</a></li><li class="chapter-item expanded "><a href="../../../application_services.html">Application Services</a></li><li class="chapter-item expanded "><a href="../../../server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="../../../consent_tracking.html">Consent Tracking</a></li><li class="chapter-item expanded "><a href="../../../development/url_previews.html">URL Previews</a></li><li class="chapter-item expanded "><a href="../../../user_directory.html">User Directory</a></li><li class="chapter-item expanded "><a href="../../../message_retention_policies.html">Message Retention Policies</a></li><li class="chapter-item expanded "><a href="../../../modules/index.html">Pluggable Modules</a></li><li><ol 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href="../../../modules/account_data_callbacks.html">Account data callbacks</a></li><li class="chapter-item expanded "><a href="../../../modules/porting_legacy_module.html">Porting a legacy module to the new interface</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../../../workers.html">Workers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../synctl_workers.html">Using synctl with Workers</a></li><li class="chapter-item expanded "><a href="../../../systemd-with-workers/index.html">Systemd</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../../../usage/administration/index.html">Administration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../usage/administration/admin_api/index.html">Admin API</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../admin_api/account_validity.html">Account Validity</a></li><li class="chapter-item expanded "><a href="../../../usage/administration/admin_api/background_updates.html" class="active">Background Updates</a></li><li class="chapter-item expanded "><a href="../../../admin_api/event_reports.html">Event Reports</a></li><li class="chapter-item expanded "><a href="../../../admin_api/media_admin_api.html">Media</a></li><li class="chapter-item expanded "><a href="../../../admin_api/purge_history_api.html">Purge History</a></li><li class="chapter-item expanded "><a href="../../../admin_api/register_api.html">Register Users</a></li><li class="chapter-item expanded "><a href="../../../usage/administration/admin_api/registration_tokens.html">Registration Tokens</a></li><li class="chapter-item expanded "><a href="../../../admin_api/room_membership.html">Manipulate Room Membership</a></li><li class="chapter-item expanded "><a href="../../../admin_api/rooms.html">Rooms</a></li><li class="chapter-item expanded "><a href="../../../admin_api/server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="../../../admin_api/statistics.html">Statistics</a></li><li class="chapter-item expanded "><a href="../../../admin_api/user_admin_api.html">Users</a></li><li class="chapter-item expanded "><a href="../../../admin_api/version_api.html">Server Version</a></li><li class="chapter-item expanded "><a href="../../../usage/administration/admin_api/federation.html">Federation</a></li></ol></li><li class="chapter-item expanded "><a href="../../../manhole.html">Manhole</a></li><li class="chapter-item expanded "><a href="../../../metrics-howto.html">Monitoring</a></li><li class="chapter-item expanded "><a href="../../../usage/administration/understanding_synapse_through_grafana_graphs.html">Understanding Synapse Through Grafana Graphs</a></li><li class="chapter-item expanded "><a href="../../../usage/administration/useful_sql_for_admins.html">Useful SQL for Admins</a></li><li class="chapter-item expanded "><a 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href="../../../replication.html">Replication</a></li><li class="chapter-item expanded "><a href="../../../tcp_replication.html">TCP Replication</a></li></ol></li><li class="chapter-item expanded "><a href="../../../development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../development/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="../../../development/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><a href="../../../development/room-dag-concepts.html">Room DAG concepts</a></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="../../../media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="../../../room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="../../../deprecation_policy.html">Dependency Deprecation Policy</a></li><li class="chapter-item expanded "><a href="../../../other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol>
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+                        <!-- Page table of contents -->
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+                        </div>
+
+                        <h1 id="background-updates-api"><a class="header" href="#background-updates-api">Background Updates API</a></h1>
+<p>This API allows a server administrator to manage the background updates being
+run against the database.</p>
+<h2 id="status"><a class="header" href="#status">Status</a></h2>
+<p>This API gets the current status of the background updates.</p>
+<p>The API is:</p>
+<pre><code>GET /_synapse/admin/v1/background_updates/status
+</code></pre>
+<p>Returning:</p>
+<pre><code class="language-json">{
+    &quot;enabled&quot;: true,
+    &quot;current_updates&quot;: {
+        &quot;&lt;db_name&gt;&quot;: {
+            &quot;name&quot;: &quot;&lt;background_update_name&gt;&quot;,
+            &quot;total_item_count&quot;: 50,
+            &quot;total_duration_ms&quot;: 10000.0,
+            &quot;average_items_per_ms&quot;: 2.2,
+        },
+    }
+}
+</code></pre>
+<p><code>enabled</code> whether the background updates are enabled or disabled.</p>
+<p><code>db_name</code> the database name (usually Synapse is configured with a single database named 'master').</p>
+<p>For each update:</p>
+<p><code>name</code> the name of the update.
+<code>total_item_count</code> total number of &quot;items&quot; processed (the meaning of 'items' depends on the update in question).
+<code>total_duration_ms</code> how long the background process has been running, not including time spent sleeping.
+<code>average_items_per_ms</code> how many items are processed per millisecond based on an exponential average.</p>
+<h2 id="enabled"><a class="header" href="#enabled">Enabled</a></h2>
+<p>This API allow pausing background updates.</p>
+<p>Background updates should <em>not</em> be paused for significant periods of time, as
+this can affect the performance of Synapse.</p>
+<p><em>Note</em>: This won't persist over restarts.</p>
+<p><em>Note</em>: This won't cancel any update query that is currently running. This is
+usually fine since most queries are short lived, except for <code>CREATE INDEX</code>
+background updates which won't be cancelled once started.</p>
+<p>The API is:</p>
+<pre><code>POST /_synapse/admin/v1/background_updates/enabled
+</code></pre>
+<p>with the following body:</p>
+<pre><code class="language-json">{
+    &quot;enabled&quot;: false
+}
+</code></pre>
+<p><code>enabled</code> sets whether the background updates are enabled or disabled.</p>
+<p>The API returns the <code>enabled</code> param.</p>
+<pre><code class="language-json">{
+    &quot;enabled&quot;: false
+}
+</code></pre>
+<p>There is also a <code>GET</code> version which returns the <code>enabled</code> state.</p>
+<h2 id="run"><a class="header" href="#run">Run</a></h2>
+<p>This API schedules a specific background update to run. The job starts immediately after calling the API.</p>
+<p>The API is:</p>
+<pre><code>POST /_synapse/admin/v1/background_updates/start_job
+</code></pre>
+<p>with the following body:</p>
+<pre><code class="language-json">{
+    &quot;job_name&quot;: &quot;populate_stats_process_rooms&quot;
+}
+</code></pre>
+<p>The following JSON body parameters are available:</p>
+<ul>
+<li><code>job_name</code> - A string which job to run. Valid values are:
+<ul>
+<li><code>populate_stats_process_rooms</code> - Recalculate the stats for all rooms.</li>
+<li><code>regenerate_directory</code> - Recalculate the <a href="../../../user_directory.html">user directory</a> if it is stale or out of sync.</li>
+</ul>
+</li>
+</ul>
+
+                    </main>
+
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+                        <!-- Mobile navigation buttons -->
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+
+                        <h1 id="federation-api"><a class="header" href="#federation-api">Federation API</a></h1>
+<p>This API allows a server administrator to manage Synapse's federation with other homeservers.</p>
+<p>Note: This API is new, experimental and &quot;subject to change&quot;.</p>
+<h2 id="list-of-destinations"><a class="header" href="#list-of-destinations">List of destinations</a></h2>
+<p>This API gets the current destination retry timing info for all remote servers.</p>
+<p>The list contains all the servers with which the server federates,
+regardless of whether an error occurred or not.
+If an error occurs, it may take up to 20 minutes for the error to be displayed here,
+as a complete retry must have failed.</p>
+<p>The API is:</p>
+<p>A standard request with no filtering:</p>
+<pre><code>GET /_synapse/admin/v1/federation/destinations
+</code></pre>
+<p>A response body like the following is returned:</p>
+<pre><code class="language-json">{
+   &quot;destinations&quot;:[
+      {
+         &quot;destination&quot;: &quot;matrix.org&quot;,
+         &quot;retry_last_ts&quot;: 1557332397936,
+         &quot;retry_interval&quot;: 3000000,
+         &quot;failure_ts&quot;: 1557329397936,
+         &quot;last_successful_stream_ordering&quot;: null
+      }
+   ],
+   &quot;total&quot;: 1
+}
+</code></pre>
+<p>To paginate, check for <code>next_token</code> and if present, call the endpoint again
+with <code>from</code> set to the value of <code>next_token</code>. This will return a new page.</p>
+<p>If the endpoint does not return a <code>next_token</code> then there are no more destinations
+to paginate through.</p>
+<p><strong>Parameters</strong></p>
+<p>The following query parameters are available:</p>
+<ul>
+<li><code>from</code> - Offset in the returned list. Defaults to <code>0</code>.</li>
+<li><code>limit</code> - Maximum amount of destinations to return. Defaults to <code>100</code>.</li>
+<li><code>order_by</code> - The method in which to sort the returned list of destinations.
+Valid values are:
+<ul>
+<li><code>destination</code> - Destinations are ordered alphabetically by remote server name.
+This is the default.</li>
+<li><code>retry_last_ts</code> - Destinations are ordered by time of last retry attempt in ms.</li>
+<li><code>retry_interval</code> - Destinations are ordered by how long until next retry in ms.</li>
+<li><code>failure_ts</code> - Destinations are ordered by when the server started failing in ms.</li>
+<li><code>last_successful_stream_ordering</code> - Destinations are ordered by the stream ordering
+of the most recent successfully-sent PDU.</li>
+</ul>
+</li>
+<li><code>dir</code> - Direction of room order. Either <code>f</code> for forwards or <code>b</code> for backwards. Setting
+this value to <code>b</code> will reverse the above sort order. Defaults to <code>f</code>.</li>
+</ul>
+<p><em>Caution:</em> The database only has an index on the column <code>destination</code>.
+This means that if a different sort order is used,
+this can cause a large load on the database, especially for large environments.</p>
+<p><strong>Response</strong></p>
+<p>The following fields are returned in the JSON response body:</p>
+<ul>
+<li><code>destinations</code> - An array of objects, each containing information about a destination.
+Destination objects contain the following fields:
+<ul>
+<li><code>destination</code> - string - Name of the remote server to federate.</li>
+<li><code>retry_last_ts</code> - integer - The last time Synapse tried and failed to reach the
+remote server, in ms. This is <code>0</code> if the last attempt to communicate with the
+remote server was successful.</li>
+<li><code>retry_interval</code> - integer - How long since the last time Synapse tried to reach
+the remote server before trying again, in ms. This is <code>0</code> if no further retrying occuring.</li>
+<li><code>failure_ts</code> - nullable integer - The first time Synapse tried and failed to reach the
+remote server, in ms. This is <code>null</code> if communication with the remote server has never failed.</li>
+<li><code>last_successful_stream_ordering</code> - nullable integer - The stream ordering of the most
+recent successfully-sent <a href="understanding_synapse_through_grafana_graphs.html#federation">PDU</a>
+to this destination, or <code>null</code> if this information has not been tracked yet.</li>
+</ul>
+</li>
+<li><code>next_token</code>: string representing a positive integer - Indication for pagination. See above.</li>
+<li><code>total</code> - integer - Total number of destinations.</li>
+</ul>
+<h2 id="destination-details-api"><a class="header" href="#destination-details-api">Destination Details API</a></h2>
+<p>This API gets the retry timing info for a specific remote server.</p>
+<p>The API is:</p>
+<pre><code>GET /_synapse/admin/v1/federation/destinations/&lt;destination&gt;
+</code></pre>
+<p>A response body like the following is returned:</p>
+<pre><code class="language-json">{
+   &quot;destination&quot;: &quot;matrix.org&quot;,
+   &quot;retry_last_ts&quot;: 1557332397936,
+   &quot;retry_interval&quot;: 3000000,
+   &quot;failure_ts&quot;: 1557329397936,
+   &quot;last_successful_stream_ordering&quot;: null
+}
+</code></pre>
+<p><strong>Parameters</strong></p>
+<p>The following parameters should be set in the URL:</p>
+<ul>
+<li><code>destination</code> - Name of the remote server.</li>
+</ul>
+<p><strong>Response</strong></p>
+<p>The response fields are the same like in the <code>destinations</code> array in
+<a href="#list-of-destinations">List of destinations</a> response.</p>
+<h2 id="destination-rooms"><a class="header" href="#destination-rooms">Destination rooms</a></h2>
+<p>This API gets the rooms that federate with a specific remote server.</p>
+<p>The API is:</p>
+<pre><code>GET /_synapse/admin/v1/federation/destinations/&lt;destination&gt;/rooms
+</code></pre>
+<p>A response body like the following is returned:</p>
+<pre><code class="language-json">{
+   &quot;rooms&quot;:[
+      {
+         &quot;room_id&quot;: &quot;!OGEhHVWSdvArJzumhm:matrix.org&quot;,
+         &quot;stream_ordering&quot;: 8326
+      },
+      {
+         &quot;room_id&quot;: &quot;!xYvNcQPhnkrdUmYczI:matrix.org&quot;,
+         &quot;stream_ordering&quot;: 93534
+      }
+   ],
+   &quot;total&quot;: 2
+}
+</code></pre>
+<p>To paginate, check for <code>next_token</code> and if present, call the endpoint again
+with <code>from</code> set to the value of <code>next_token</code>. This will return a new page.</p>
+<p>If the endpoint does not return a <code>next_token</code> then there are no more destinations
+to paginate through.</p>
+<p><strong>Parameters</strong></p>
+<p>The following parameters should be set in the URL:</p>
+<ul>
+<li><code>destination</code> - Name of the remote server.</li>
+</ul>
+<p>The following query parameters are available:</p>
+<ul>
+<li><code>from</code> - Offset in the returned list. Defaults to <code>0</code>.</li>
+<li><code>limit</code> - Maximum amount of destinations to return. Defaults to <code>100</code>.</li>
+<li><code>dir</code> - Direction of room order by <code>room_id</code>. Either <code>f</code> for forwards or <code>b</code> for
+backwards. Defaults to <code>f</code>.</li>
+</ul>
+<p><strong>Response</strong></p>
+<p>The following fields are returned in the JSON response body:</p>
+<ul>
+<li><code>rooms</code> - An array of objects, each containing information about a room.
+Room objects contain the following fields:
+<ul>
+<li><code>room_id</code> - string - The ID of the room.</li>
+<li><code>stream_ordering</code> - integer -  The stream ordering of the most recent
+successfully-sent <a href="understanding_synapse_through_grafana_graphs.html#federation">PDU</a>
+to this destination in this room.</li>
+</ul>
+</li>
+<li><code>next_token</code>: string representing a positive integer - Indication for pagination. See above.</li>
+<li><code>total</code> - integer - Total number of destinations.</li>
+</ul>
+<h2 id="reset-connection-timeout"><a class="header" href="#reset-connection-timeout">Reset connection timeout</a></h2>
+<p>Synapse makes federation requests to other homeservers. If a federation request fails,
+Synapse will mark the destination homeserver as offline, preventing any future requests
+to that server for a &quot;cooldown&quot; period. This period grows over time if the server
+continues to fail its responses
+(<a href="https://en.wikipedia.org/wiki/Exponential_backoff">exponential backoff</a>).</p>
+<p>Admins can cancel the cooldown period with this API.</p>
+<p>This API resets the retry timing for a specific remote server and tries to connect to
+the remote server again. It does not wait for the next <code>retry_interval</code>.
+The connection must have previously run into an error and <code>retry_last_ts</code>
+(<a href="#destination-details-api">Destination Details API</a>) must not be equal to <code>0</code>.</p>
+<p>The connection attempt is carried out in the background and can take a while
+even if the API already returns the http status 200.</p>
+<p>The API is:</p>
+<pre><code>POST /_synapse/admin/v1/federation/destinations/&lt;destination&gt;/reset_connection
+
+{}
+</code></pre>
+<p><strong>Parameters</strong></p>
+<p>The following parameters should be set in the URL:</p>
+<ul>
+<li><code>destination</code> - Name of the remote server.</li>
+</ul>
+
+                    </main>
+
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diff --git a/v1.62/usage/administration/admin_api/index.html b/v1.62/usage/administration/admin_api/index.html
new file mode 100644
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--- /dev/null
+++ b/v1.62/usage/administration/admin_api/index.html
@@ -0,0 +1,207 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
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Notices</a></li><li class="chapter-item expanded "><a href="../../../admin_api/statistics.html">Statistics</a></li><li class="chapter-item expanded "><a href="../../../admin_api/user_admin_api.html">Users</a></li><li class="chapter-item expanded "><a href="../../../admin_api/version_api.html">Server Version</a></li><li class="chapter-item expanded "><a href="../../../usage/administration/admin_api/federation.html">Federation</a></li></ol></li><li class="chapter-item expanded "><a href="../../../manhole.html">Manhole</a></li><li class="chapter-item expanded "><a href="../../../metrics-howto.html">Monitoring</a></li><li class="chapter-item expanded "><a href="../../../usage/administration/understanding_synapse_through_grafana_graphs.html">Understanding Synapse Through Grafana Graphs</a></li><li class="chapter-item expanded "><a href="../../../usage/administration/useful_sql_for_admins.html">Useful SQL for Admins</a></li><li class="chapter-item expanded "><a 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+                        <h1 id="the-admin-api"><a class="header" href="#the-admin-api">The Admin API</a></h1>
+<h2 id="authenticate-as-a-server-admin"><a class="header" href="#authenticate-as-a-server-admin">Authenticate as a server admin</a></h2>
+<p>Many of the API calls in the admin api will require an <code>access_token</code> for a
+server admin. (Note that a server admin is distinct from a room admin.)</p>
+<p>A user can be marked as a server admin by updating the database directly, e.g.:</p>
+<pre><code class="language-sql">UPDATE users SET admin = 1 WHERE name = '@foo:bar.com';
+</code></pre>
+<p>A new server admin user can also be created using the <code>register_new_matrix_user</code>
+command. This is a script that is distributed as part of synapse. It is possibly
+already on your <code>$PATH</code> depending on how Synapse was installed.</p>
+<p>Finding your user's <code>access_token</code> is client-dependent, but will usually be shown in the client's settings.</p>
+<h2 id="making-an-admin-api-request"><a class="header" href="#making-an-admin-api-request">Making an Admin API request</a></h2>
+<p>Once you have your <code>access_token</code>, you will need to authenticate each request to an Admin API endpoint by
+providing the token as either a query parameter or a request header. To add it as a request header in cURL:</p>
+<pre><code class="language-sh">curl --header &quot;Authorization: Bearer &lt;access_token&gt;&quot; &lt;the_rest_of_your_API_request&gt;
+</code></pre>
+<p>For more details on access tokens in Matrix, please refer to the complete
+<a href="https://matrix.org/docs/spec/client_server/r0.6.1#using-access-tokens">matrix spec documentation</a>.</p>
+
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+
+                        <h1 id="registration-tokens"><a class="header" href="#registration-tokens">Registration Tokens</a></h1>
+<p>This API allows you to manage tokens which can be used to authenticate
+registration requests, as proposed in
+<a href="https://github.com/matrix-org/matrix-doc/blob/main/proposals/3231-token-authenticated-registration.md">MSC3231</a>.
+To use it, you will need to enable the <code>registration_requires_token</code> config
+option, and authenticate by providing an <code>access_token</code> for a server admin:
+see <a href="../../usage/administration/admin_api">Admin API</a>.
+Note that this API is still experimental; not all clients may support it yet.</p>
+<h2 id="registration-token-objects"><a class="header" href="#registration-token-objects">Registration token objects</a></h2>
+<p>Most endpoints make use of JSON objects that contain details about tokens.
+These objects have the following fields:</p>
+<ul>
+<li><code>token</code>: The token which can be used to authenticate registration.</li>
+<li><code>uses_allowed</code>: The number of times the token can be used to complete a
+registration before it becomes invalid.</li>
+<li><code>pending</code>: The number of pending uses the token has. When someone uses
+the token to authenticate themselves, the pending counter is incremented
+so that the token is not used more than the permitted number of times.
+When the person completes registration the pending counter is decremented,
+and the completed counter is incremented.</li>
+<li><code>completed</code>: The number of times the token has been used to successfully
+complete a registration.</li>
+<li><code>expiry_time</code>: The latest time the token is valid. Given as the number of
+milliseconds since 1970-01-01 00:00:00 UTC (the start of the Unix epoch).
+To convert this into a human-readable form you can remove the milliseconds
+and use the <code>date</code> command. For example, <code>date -d '@1625394937'</code>.</li>
+</ul>
+<h2 id="list-all-tokens"><a class="header" href="#list-all-tokens">List all tokens</a></h2>
+<p>Lists all tokens and details about them. If the request is successful, the top
+level JSON object will have a <code>registration_tokens</code> key which is an array of
+registration token objects.</p>
+<pre><code>GET /_synapse/admin/v1/registration_tokens
+</code></pre>
+<p>Optional query parameters:</p>
+<ul>
+<li><code>valid</code>: <code>true</code> or <code>false</code>. If <code>true</code>, only valid tokens are returned.
+If <code>false</code>, only tokens that have expired or have had all uses exhausted are
+returned. If omitted, all tokens are returned regardless of validity.</li>
+</ul>
+<p>Example:</p>
+<pre><code>GET /_synapse/admin/v1/registration_tokens
+</code></pre>
+<pre><code>200 OK
+
+{
+    &quot;registration_tokens&quot;: [
+        {
+            &quot;token&quot;: &quot;abcd&quot;,
+            &quot;uses_allowed&quot;: 3,
+            &quot;pending&quot;: 0,
+            &quot;completed&quot;: 1,
+            &quot;expiry_time&quot;: null
+        },
+        {
+            &quot;token&quot;: &quot;pqrs&quot;,
+            &quot;uses_allowed&quot;: 2,
+            &quot;pending&quot;: 1,
+            &quot;completed&quot;: 1,
+            &quot;expiry_time&quot;: null
+        },
+        {
+            &quot;token&quot;: &quot;wxyz&quot;,
+            &quot;uses_allowed&quot;: null,
+            &quot;pending&quot;: 0,
+            &quot;completed&quot;: 9,
+            &quot;expiry_time&quot;: 1625394937000    // 2021-07-04 10:35:37 UTC
+        }
+    ]
+}
+</code></pre>
+<p>Example using the <code>valid</code> query parameter:</p>
+<pre><code>GET /_synapse/admin/v1/registration_tokens?valid=false
+</code></pre>
+<pre><code>200 OK
+
+{
+    &quot;registration_tokens&quot;: [
+        {
+            &quot;token&quot;: &quot;pqrs&quot;,
+            &quot;uses_allowed&quot;: 2,
+            &quot;pending&quot;: 1,
+            &quot;completed&quot;: 1,
+            &quot;expiry_time&quot;: null
+        },
+        {
+            &quot;token&quot;: &quot;wxyz&quot;,
+            &quot;uses_allowed&quot;: null,
+            &quot;pending&quot;: 0,
+            &quot;completed&quot;: 9,
+            &quot;expiry_time&quot;: 1625394937000    // 2021-07-04 10:35:37 UTC
+        }
+    ]
+}
+</code></pre>
+<h2 id="get-one-token"><a class="header" href="#get-one-token">Get one token</a></h2>
+<p>Get details about a single token. If the request is successful, the response
+body will be a registration token object.</p>
+<pre><code>GET /_synapse/admin/v1/registration_tokens/&lt;token&gt;
+</code></pre>
+<p>Path parameters:</p>
+<ul>
+<li><code>token</code>: The registration token to return details of.</li>
+</ul>
+<p>Example:</p>
+<pre><code>GET /_synapse/admin/v1/registration_tokens/abcd
+</code></pre>
+<pre><code>200 OK
+
+{
+    &quot;token&quot;: &quot;abcd&quot;,
+    &quot;uses_allowed&quot;: 3,
+    &quot;pending&quot;: 0,
+    &quot;completed&quot;: 1,
+    &quot;expiry_time&quot;: null
+}
+</code></pre>
+<h2 id="create-token"><a class="header" href="#create-token">Create token</a></h2>
+<p>Create a new registration token. If the request is successful, the newly created
+token will be returned as a registration token object in the response body.</p>
+<pre><code>POST /_synapse/admin/v1/registration_tokens/new
+</code></pre>
+<p>The request body must be a JSON object and can contain the following fields:</p>
+<ul>
+<li><code>token</code>: The registration token. A string of no more than 64 characters that
+consists only of characters matched by the regex <code>[A-Za-z0-9._~-]</code>.
+Default: randomly generated.</li>
+<li><code>uses_allowed</code>: The integer number of times the token can be used to complete
+a registration before it becomes invalid.
+Default: <code>null</code> (unlimited uses).</li>
+<li><code>expiry_time</code>: The latest time the token is valid. Given as the number of
+milliseconds since 1970-01-01 00:00:00 UTC (the start of the Unix epoch).
+You could use, for example, <code>date '+%s000' -d 'tomorrow'</code>.
+Default: <code>null</code> (token does not expire).</li>
+<li><code>length</code>: The length of the token randomly generated if <code>token</code> is not
+specified. Must be between 1 and 64 inclusive. Default: <code>16</code>.</li>
+</ul>
+<p>If a field is omitted the default is used.</p>
+<p>Example using defaults:</p>
+<pre><code>POST /_synapse/admin/v1/registration_tokens/new
+
+{}
+</code></pre>
+<pre><code>200 OK
+
+{
+    &quot;token&quot;: &quot;0M-9jbkf2t_Tgiw1&quot;,
+    &quot;uses_allowed&quot;: null,
+    &quot;pending&quot;: 0,
+    &quot;completed&quot;: 0,
+    &quot;expiry_time&quot;: null
+}
+</code></pre>
+<p>Example specifying some fields:</p>
+<pre><code>POST /_synapse/admin/v1/registration_tokens/new
+
+{
+    &quot;token&quot;: &quot;defg&quot;,
+    &quot;uses_allowed&quot;: 1
+}
+</code></pre>
+<pre><code>200 OK
+
+{
+    &quot;token&quot;: &quot;defg&quot;,
+    &quot;uses_allowed&quot;: 1,
+    &quot;pending&quot;: 0,
+    &quot;completed&quot;: 0,
+    &quot;expiry_time&quot;: null
+}
+</code></pre>
+<h2 id="update-token"><a class="header" href="#update-token">Update token</a></h2>
+<p>Update the number of allowed uses or expiry time of a token. If the request is
+successful, the updated token will be returned as a registration token object
+in the response body.</p>
+<pre><code>PUT /_synapse/admin/v1/registration_tokens/&lt;token&gt;
+</code></pre>
+<p>Path parameters:</p>
+<ul>
+<li><code>token</code>: The registration token to update.</li>
+</ul>
+<p>The request body must be a JSON object and can contain the following fields:</p>
+<ul>
+<li><code>uses_allowed</code>: The integer number of times the token can be used to complete
+a registration before it becomes invalid. By setting <code>uses_allowed</code> to <code>0</code>
+the token can be easily made invalid without deleting it.
+If <code>null</code> the token will have an unlimited number of uses.</li>
+<li><code>expiry_time</code>: The latest time the token is valid. Given as the number of
+milliseconds since 1970-01-01 00:00:00 UTC (the start of the Unix epoch).
+If <code>null</code> the token will not expire.</li>
+</ul>
+<p>If a field is omitted its value is not modified.</p>
+<p>Example:</p>
+<pre><code>PUT /_synapse/admin/v1/registration_tokens/defg
+
+{
+    &quot;expiry_time&quot;: 4781243146000    // 2121-07-06 11:05:46 UTC
+}
+</code></pre>
+<pre><code>200 OK
+
+{
+    &quot;token&quot;: &quot;defg&quot;,
+    &quot;uses_allowed&quot;: 1,
+    &quot;pending&quot;: 0,
+    &quot;completed&quot;: 0,
+    &quot;expiry_time&quot;: 4781243146000
+}
+</code></pre>
+<h2 id="delete-token"><a class="header" href="#delete-token">Delete token</a></h2>
+<p>Delete a registration token. If the request is successful, the response body
+will be an empty JSON object.</p>
+<pre><code>DELETE /_synapse/admin/v1/registration_tokens/&lt;token&gt;
+</code></pre>
+<p>Path parameters:</p>
+<ul>
+<li><code>token</code>: The registration token to delete.</li>
+</ul>
+<p>Example:</p>
+<pre><code>DELETE /_synapse/admin/v1/registration_tokens/wxyz
+</code></pre>
+<pre><code>200 OK
+
+{}
+</code></pre>
+<h2 id="errors"><a class="header" href="#errors">Errors</a></h2>
+<p>If a request fails a &quot;standard error response&quot; will be returned as defined in
+the <a href="https://matrix.org/docs/spec/client_server/r0.6.1#api-standards">Matrix Client-Server API specification</a>.</p>
+<p>For example, if the token specified in a path parameter does not exist a
+<code>404 Not Found</code> error will be returned.</p>
+<pre><code>GET /_synapse/admin/v1/registration_tokens/1234
+</code></pre>
+<pre><code>404 Not Found
+
+{
+    &quot;errcode&quot;: &quot;M_NOT_FOUND&quot;,
+    &quot;error&quot;: &quot;No such registration token: 1234&quot;
+}
+</code></pre>
+
+                    </main>
+
+                    <nav class="nav-wrapper" aria-label="Page navigation">
+                        <!-- Mobile navigation buttons -->
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diff --git a/v1.62/usage/administration/admin_faq.html b/v1.62/usage/administration/admin_faq.html
new file mode 100644
index 0000000000..3d5242afb2
--- /dev/null
+++ b/v1.62/usage/administration/admin_faq.html
@@ -0,0 +1,251 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
+    <head>
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+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div class="sidebar-scrollbox">
+                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="../../welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="../../setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="../../postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="../../reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="../../setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="../../turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="../../delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item 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+                    Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
+                        link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
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+
+                        <h2 id="admin-faq"><a class="header" href="#admin-faq">Admin FAQ</a></h2>
+<h2 id="how-do-i-become-a-server-admin"><a class="header" href="#how-do-i-become-a-server-admin">How do I become a server admin?</a></h2>
+<p>If your server already has an admin account you should use the user admin API to promote other accounts to become admins. See <a href="../../admin_api/user_admin_api.html#Change-whether-a-user-is-a-server-administrator-or-not">User Admin API</a></p>
+<p>If you don't have any admin accounts yet you won't be able to use the admin API so you'll have to edit the database manually. Manually editing the database is generally not recommended so once you have an admin account, use the admin APIs to make further changes.</p>
+<pre><code class="language-sql">UPDATE users SET admin = 1 WHERE name = '@foo:bar.com';
+</code></pre>
+<h2 id="what-servers-are-my-server-talking-to"><a class="header" href="#what-servers-are-my-server-talking-to">What servers are my server talking to?</a></h2>
+<p>Run this sql query on your db:</p>
+<pre><code class="language-sql">SELECT * FROM destinations;
+</code></pre>
+<h2 id="what-servers-are-currently-participating-in-this-room"><a class="header" href="#what-servers-are-currently-participating-in-this-room">What servers are currently participating in this room?</a></h2>
+<p>Run this sql query on your db:</p>
+<pre><code class="language-sql">SELECT DISTINCT split_part(state_key, ':', 2)
+    FROM current_state_events AS c
+    INNER JOIN room_memberships AS m USING (room_id, event_id)
+    WHERE room_id = '!cURbafjkfsMDVwdRDQ:matrix.org' AND membership = 'join';
+</code></pre>
+<h2 id="what-users-are-registered-on-my-server"><a class="header" href="#what-users-are-registered-on-my-server">What users are registered on my server?</a></h2>
+<pre><code class="language-sql">SELECT NAME from users;
+</code></pre>
+<h2 id="manually-resetting-passwords"><a class="header" href="#manually-resetting-passwords">Manually resetting passwords:</a></h2>
+<p>See https://github.com/matrix-org/synapse/blob/master/README.rst#password-reset</p>
+<h2 id="i-have-a-problem-with-my-server-can-i-just-delete-my-database-and-start-again"><a class="header" href="#i-have-a-problem-with-my-server-can-i-just-delete-my-database-and-start-again">I have a problem with my server. Can I just delete my database and start again?</a></h2>
+<p>Deleting your database is unlikely to make anything better. </p>
+<p>It's easy to make the mistake of thinking that you can start again from a clean slate by dropping your database, but things don't work like that in a federated network: lots of other servers have information about your server.</p>
+<p>For example: other servers might think that you are in a room, your server will think that you are not, and you'll probably be unable to interact with that room in a sensible way ever again.</p>
+<p>In general, there are better solutions to any problem than dropping the database. Come and seek help in https://matrix.to/#/#synapse:matrix.org.</p>
+<p>There are two exceptions when it might be sensible to delete your database and start again:</p>
+<ul>
+<li>You have <em>never</em> joined any rooms which are federated with other servers. For instance, a local deployment which the outside world can't talk to. </li>
+<li>You are changing the <code>server_name</code> in the homeserver configuration. In effect this makes your server a completely new one from the point of view of the network, so in this case it makes sense to start with a clean database.
+(In both cases you probably also want to clear out the media_store.)</li>
+</ul>
+<h2 id="ive-stuffed-up-access-to-my-room-how-can-i-delete-it-to-free-up-the-alias"><a class="header" href="#ive-stuffed-up-access-to-my-room-how-can-i-delete-it-to-free-up-the-alias">I've stuffed up access to my room, how can I delete it to free up the alias?</a></h2>
+<p>Using the following curl command:</p>
+<pre><code>curl -H 'Authorization: Bearer &lt;access-token&gt;' -X DELETE https://matrix.org/_matrix/client/r0/directory/room/&lt;room-alias&gt;
+</code></pre>
+<p><code>&lt;access-token&gt;</code> - can be obtained in riot by looking in the riot settings, down the bottom is:
+Access Token:&lt;click to reveal&gt; </p>
+<p><code>&lt;room-alias&gt;</code> - the room alias, eg. #my_room:matrix.org this possibly needs to be URL encoded also, for example  %23my_room%3Amatrix.org</p>
+<h2 id="how-can-i-find-the-lines-corresponding-to-a-given-http-request-in-my-homeserver-log"><a class="header" href="#how-can-i-find-the-lines-corresponding-to-a-given-http-request-in-my-homeserver-log">How can I find the lines corresponding to a given HTTP request in my homeserver log?</a></h2>
+<p>Synapse tags each log line according to the HTTP request it is processing. When it finishes processing each request, it logs a line containing the words <code>Processed request: </code>. For example:</p>
+<pre><code>2019-02-14 22:35:08,196 - synapse.access.http.8008 - 302 - INFO - GET-37 - ::1 - 8008 - {@richvdh:localhost} Processed request: 0.173sec/0.001sec (0.002sec, 0.000sec) (0.027sec/0.026sec/2) 687B 200 &quot;GET /_matrix/client/r0/sync HTTP/1.1&quot; &quot;Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36&quot; [0 dbevts]&quot;
+</code></pre>
+<p>Here we can see that the request has been tagged with <code>GET-37</code>. (The tag depends on the method of the HTTP request, so might start with <code>GET-</code>, <code>PUT-</code>, <code>POST-</code>, <code>OPTIONS-</code> or <code>DELETE-</code>.) So to find all lines corresponding to this request, we can do:</p>
+<pre><code>grep 'GET-37' homeserver.log
+</code></pre>
+<p>If you want to paste that output into a github issue or matrix room, please remember to surround it with triple-backticks (```) to make it legible (see https://help.github.com/en/articles/basic-writing-and-formatting-syntax#quoting-code).</p>
+<h2 id="what-do-all-those-fields-in-the-processed-line-mean"><a class="header" href="#what-do-all-those-fields-in-the-processed-line-mean">What do all those fields in the 'Processed' line mean?</a></h2>
+<p>See <a href="request_log.html">Request log format</a>.</p>
+<h2 id="what-are-the-biggest-rooms-on-my-server"><a class="header" href="#what-are-the-biggest-rooms-on-my-server">What are the biggest rooms on my server?</a></h2>
+<pre><code class="language-sql">SELECT s.canonical_alias, g.room_id, count(*) AS num_rows 
+FROM 
+  state_groups_state AS g, 
+  room_stats_state AS s 
+WHERE g.room_id = s.room_id 
+GROUP BY s.canonical_alias, g.room_id
+ORDER BY num_rows desc 
+LIMIT 10;
+</code></pre>
+<p>You can also use the <a href="../../admin_api/rooms.html#list-room-api">List Room API</a>
+and <code>order_by</code> <code>state_events</code>.</p>
+
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new file mode 100644
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+
+                        <p>This blog post by Victor Berger explains how to use many of the tools listed on this page: https://levans.fr/shrink-synapse-database.html</p>
+<h1 id="list-of-useful-tools-and-scripts-for-maintenance-synapse-database"><a class="header" href="#list-of-useful-tools-and-scripts-for-maintenance-synapse-database">List of useful tools and scripts for maintenance Synapse database:</a></h1>
+<h2 id="purge-remote-media-api"><a class="header" href="#purge-remote-media-api"><a href="../../admin_api/media_admin_api.html#purge-remote-media-api">Purge Remote Media API</a></a></h2>
+<p>The purge remote media API allows server admins to purge old cached remote media.</p>
+<h2 id="purge-local-media-api"><a class="header" href="#purge-local-media-api"><a href="../../admin_api/media_admin_api.html#delete-local-media">Purge Local Media API</a></a></h2>
+<p>This API deletes the <em>local</em> media from the disk of your own server.</p>
+<h2 id="purge-history-api"><a class="header" href="#purge-history-api"><a href="../../admin_api/purge_history_api.html">Purge History API</a></a></h2>
+<p>The purge history API allows server admins to purge historic events from their database, reclaiming disk space.</p>
+<h2 id="synapse-compress-state"><a class="header" href="#synapse-compress-state"><a href="https://github.com/matrix-org/rust-synapse-compress-state">synapse-compress-state</a></a></h2>
+<p>Tool for compressing (deduplicating) <code>state_groups_state</code> table.</p>
+<h2 id="sql-for-analyzing-synapse-postgresql-database-stats"><a class="header" href="#sql-for-analyzing-synapse-postgresql-database-stats"><a href="useful_sql_for_admins.html">SQL for analyzing Synapse PostgreSQL database stats</a></a></h2>
+<p>Some easy SQL that reports useful stats about your Synapse database.</p>
+
+                    </main>
+
+                    <nav class="nav-wrapper" aria-label="Page navigation">
+                        <!-- Mobile navigation buttons -->
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diff --git a/v1.62/usage/administration/index.html b/v1.62/usage/administration/index.html
new file mode 100644
index 0000000000..f354cf456e
--- /dev/null
+++ b/v1.62/usage/administration/index.html
@@ -0,0 +1,196 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
+    <head>
+        <!-- Book generated using mdBook -->
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+        <title>Administration - Synapse</title>
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+            html.classList.remove('no-js')
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+
+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div class="sidebar-scrollbox">
+                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="../../welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="../../setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="../../postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="../../reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="../../setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="../../turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="../../delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a href="../../upgrade.html">Upgrading between Synapse Versions</a></li><li class="chapter-item expanded affix "><li class="part-title">Usage</li><li class="chapter-item expanded "><a href="../../federate.html">Federation</a></li><li class="chapter-item expanded "><a href="../../usage/configuration/index.html">Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../usage/configuration/config_documentation.html">Configuration Manual</a></li><li class="chapter-item expanded "><a href="../../usage/configuration/homeserver_sample_config.html">Homeserver Sample Config File</a></li><li class="chapter-item expanded "><a href="../../usage/configuration/logging_sample_config.html">Logging Sample Config File</a></li><li class="chapter-item expanded "><a href="../../structured_logging.html">Structured Logging</a></li><li class="chapter-item expanded "><a href="../../templates.html">Templates</a></li><li class="chapter-item expanded "><a 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href="../../usage/configuration/user_authentication/refresh_tokens.html">Refresh Tokens</a></li></ol></li><li class="chapter-item expanded "><a href="../../CAPTCHA_SETUP.html">Registration Captcha</a></li><li class="chapter-item expanded "><a href="../../application_services.html">Application Services</a></li><li class="chapter-item expanded "><a href="../../server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="../../consent_tracking.html">Consent Tracking</a></li><li class="chapter-item expanded "><a href="../../development/url_previews.html">URL Previews</a></li><li class="chapter-item expanded "><a href="../../user_directory.html">User Directory</a></li><li class="chapter-item expanded "><a href="../../message_retention_policies.html">Message Retention Policies</a></li><li class="chapter-item expanded "><a href="../../modules/index.html">Pluggable Modules</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../modules/writing_a_module.html">Writing a module</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../modules/spam_checker_callbacks.html">Spam checker callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/third_party_rules_callbacks.html">Third-party rules callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/presence_router_callbacks.html">Presence router callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/account_validity_callbacks.html">Account validity callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/password_auth_provider_callbacks.html">Password auth provider callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/background_update_controller_callbacks.html">Background update controller callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/account_data_callbacks.html">Account data callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/porting_legacy_module.html">Porting a legacy module to the new interface</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../../workers.html">Workers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../synctl_workers.html">Using synctl with Workers</a></li><li class="chapter-item expanded "><a href="../../systemd-with-workers/index.html">Systemd</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../../usage/administration/index.html" class="active">Administration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../usage/administration/admin_api/index.html">Admin API</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../admin_api/account_validity.html">Account Validity</a></li><li class="chapter-item expanded "><a href="../../usage/administration/admin_api/background_updates.html">Background Updates</a></li><li class="chapter-item expanded "><a href="../../admin_api/event_reports.html">Event Reports</a></li><li class="chapter-item expanded "><a href="../../admin_api/media_admin_api.html">Media</a></li><li class="chapter-item expanded "><a href="../../admin_api/purge_history_api.html">Purge History</a></li><li class="chapter-item expanded "><a href="../../admin_api/register_api.html">Register Users</a></li><li class="chapter-item expanded "><a href="../../usage/administration/admin_api/registration_tokens.html">Registration Tokens</a></li><li class="chapter-item expanded "><a href="../../admin_api/room_membership.html">Manipulate Room Membership</a></li><li class="chapter-item expanded "><a href="../../admin_api/rooms.html">Rooms</a></li><li class="chapter-item expanded "><a href="../../admin_api/server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="../../admin_api/statistics.html">Statistics</a></li><li class="chapter-item expanded "><a href="../../admin_api/user_admin_api.html">Users</a></li><li class="chapter-item expanded "><a href="../../admin_api/version_api.html">Server Version</a></li><li class="chapter-item expanded "><a href="../../usage/administration/admin_api/federation.html">Federation</a></li></ol></li><li class="chapter-item expanded "><a href="../../manhole.html">Manhole</a></li><li class="chapter-item expanded "><a href="../../metrics-howto.html">Monitoring</a></li><li class="chapter-item expanded "><a href="../../usage/administration/understanding_synapse_through_grafana_graphs.html">Understanding Synapse Through Grafana Graphs</a></li><li class="chapter-item expanded "><a href="../../usage/administration/useful_sql_for_admins.html">Useful SQL for Admins</a></li><li class="chapter-item expanded "><a href="../../usage/administration/database_maintenance_tools.html">Database Maintenance Tools</a></li><li class="chapter-item expanded "><a href="../../usage/administration/state_groups.html">State Groups</a></li><li class="chapter-item expanded "><a href="../../usage/administration/request_log.html">Request log format</a></li><li class="chapter-item expanded "><a href="../../usage/administration/admin_faq.html">Admin FAQ</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a href="../../development/contributing_guide.html">Contributing Guide</a></li><li class="chapter-item expanded "><a href="../../code_style.html">Code Style</a></li><li class="chapter-item expanded "><a href="../../development/releases.html">Release Cycle</a></li><li class="chapter-item expanded "><a href="../../development/git.html">Git Usage</a></li><li class="chapter-item expanded "><div>Testing</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../development/demo.html">Demo scripts</a></li></ol></li><li class="chapter-item expanded "><a href="../../opentracing.html">OpenTracing</a></li><li class="chapter-item expanded "><a href="../../development/database_schema.html">Database Schemas</a></li><li class="chapter-item expanded "><a href="../../development/experimental_features.html">Experimental features</a></li><li class="chapter-item expanded "><a href="../../development/dependencies.html">Dependency management</a></li><li class="chapter-item expanded "><div>Synapse Architecture</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../development/synapse_architecture/cancellation.html">Cancellation</a></li><li class="chapter-item expanded "><a href="../../log_contexts.html">Log Contexts</a></li><li class="chapter-item expanded "><a href="../../replication.html">Replication</a></li><li class="chapter-item expanded "><a href="../../tcp_replication.html">TCP Replication</a></li></ol></li><li class="chapter-item expanded "><a href="../../development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../development/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="../../development/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><a href="../../development/room-dag-concepts.html">Room DAG concepts</a></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="../../media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="../../room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="../../deprecation_policy.html">Dependency Deprecation Policy</a></li><li class="chapter-item expanded "><a href="../../other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol>
+            </div>
+            <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
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+
+                    <h1 class="menu-title">Synapse</h1>
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+                    <form id="searchbar-outer" class="searchbar-outer">
+                        <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
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+                    <div id="searchresults-outer" class="searchresults-outer hidden">
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+                        <ul id="searchresults">
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+                    </div>
+                </div>
+                <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
+                <script type="text/javascript">
+                    document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
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+                    Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
+                        link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
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+                <div id="content" class="content">
+                    <main>
+                        <!-- Page table of contents -->
+                        <div class="sidetoc">
+                            <nav class="pagetoc"></nav>
+                        </div>
+
+                        <h1 id="administration"><a class="header" href="#administration">Administration</a></h1>
+<p>This section contains information on managing your Synapse homeserver. This includes:</p>
+<ul>
+<li>Managing users, rooms and media via the Admin API.</li>
+<li>Setting up metrics and monitoring to give you insight into your homeserver's health.</li>
+<li>Configuring structured logging.</li>
+</ul>
+
+                    </main>
+
+                    <nav class="nav-wrapper" aria-label="Page navigation">
+                        <!-- Mobile navigation buttons -->
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+</html>
\ No newline at end of file
diff --git a/v1.62/usage/administration/request_log.html b/v1.62/usage/administration/request_log.html
new file mode 100644
index 0000000000..df75dbed00
--- /dev/null
+++ b/v1.62/usage/administration/request_log.html
@@ -0,0 +1,224 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>Request log format - Synapse</title>
+        <!-- Custom HTML head -->
+        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
+        <meta name="description" content="">
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <meta name="theme-color" content="#ffffff" />
+
+        <link rel="icon" href="../../favicon.svg">
+        <link rel="shortcut icon" href="../../favicon.png">
+        <link rel="stylesheet" href="../../css/variables.css">
+        <link rel="stylesheet" href="../../css/general.css">
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+                        link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
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+                </script>
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+                    <main>
+                        <!-- Page table of contents -->
+                        <div class="sidetoc">
+                            <nav class="pagetoc"></nav>
+                        </div>
+
+                        <h1 id="request-log-format"><a class="header" href="#request-log-format">Request log format</a></h1>
+<p>HTTP request logs are written by synapse (see <a href="../synapse/http/site.py"><code>site.py</code></a> for details).</p>
+<p>See the following for how to decode the dense data available from the default logging configuration.</p>
+<pre><code>2020-10-01 12:00:00,000 - synapse.access.http.8008 - 311 - INFO - PUT-1000- 192.168.0.1 - 8008 - {another-matrix-server.com} Processed request: 0.100sec/-0.000sec (0.000sec, 0.000sec) (0.001sec/0.090sec/3) 11B !200 &quot;PUT /_matrix/federation/v1/send/1600000000000 HTTP/1.1&quot; &quot;Synapse/1.20.1&quot; [0 dbevts]
+-AAAAAAAAAAAAAAAAAAAAA-   -BBBBBBBBBBBBBBBBBBBBBB-   -C-   -DD-   -EEEEEE-  -FFFFFFFFF-   -GG-    -HHHHHHHHHHHHHHHHHHHHHHH-                     -IIIIII- -JJJJJJJ-  -KKKKKK-, -LLLLLL-  -MMMMMMM- -NNNNNN- O  -P- -QQ-  -RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR-   -SSSSSSSSSSSS-   -TTTTTT-
+</code></pre>
+<table><thead><tr><th>Part</th><th>Explanation</th></tr></thead><tbody>
+<tr><td>AAAA</td><td>Timestamp request was logged (not recieved)</td></tr>
+<tr><td>BBBB</td><td>Logger name (<code>synapse.access.(http\|https).&lt;tag&gt;</code>, where 'tag' is defined in the <code>listeners</code> config section, normally the port)</td></tr>
+<tr><td>CCCC</td><td>Line number in code</td></tr>
+<tr><td>DDDD</td><td>Log Level</td></tr>
+<tr><td>EEEE</td><td>Request Identifier (This identifier is shared by related log lines)</td></tr>
+<tr><td>FFFF</td><td>Source IP (Or X-Forwarded-For if enabled)</td></tr>
+<tr><td>GGGG</td><td>Server Port</td></tr>
+<tr><td>HHHH</td><td>Federated Server or Local User making request (blank if unauthenticated or not supplied)</td></tr>
+<tr><td>IIII</td><td>Total Time to process the request</td></tr>
+<tr><td>JJJJ</td><td>Time to send response over network once generated (this may be negative if the socket is closed before the response is generated)</td></tr>
+<tr><td>KKKK</td><td>Userland CPU time</td></tr>
+<tr><td>LLLL</td><td>System CPU time</td></tr>
+<tr><td>MMMM</td><td>Total time waiting for a free DB connection from the pool across all parallel DB work from this request</td></tr>
+<tr><td>NNNN</td><td>Total time waiting for response to DB queries across all parallel DB work from this request</td></tr>
+<tr><td>OOOO</td><td>Count of DB transactions performed</td></tr>
+<tr><td>PPPP</td><td>Response body size</td></tr>
+<tr><td>QQQQ</td><td>Response status code<br/>Suffixed with <code>!</code> if the socket was closed before the response was generated.<br/>A <code>499!</code> status code indicates that Synapse also cancelled request processing after the socket was closed.<br/></td></tr>
+<tr><td>RRRR</td><td>Request</td></tr>
+<tr><td>SSSS</td><td>User-agent</td></tr>
+<tr><td>TTTT</td><td>Events fetched from DB to service this request (note that this does not include events fetched from the cache)</td></tr>
+</tbody></table>
+<p>MMMM / NNNN can be greater than IIII if there are multiple slow database queries
+running in parallel.</p>
+<p>Some actions can result in multiple identical http requests, which will return
+the same data, but only the first request will report time/transactions in
+<code>KKKK</code>/<code>LLLL</code>/<code>MMMM</code>/<code>NNNN</code>/<code>OOOO</code> - the others will be awaiting the first query to return a
+response and will simultaneously return with the first request, but with very
+small processing times.</p>
+
+                    </main>
+
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diff --git a/v1.62/usage/administration/state_groups.html b/v1.62/usage/administration/state_groups.html
new file mode 100644
index 0000000000..c16aaf2eb1
--- /dev/null
+++ b/v1.62/usage/administration/state_groups.html
@@ -0,0 +1,202 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>State Groups - Synapse</title>
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+            var html = document.querySelector('html');
+            html.classList.remove('no-js')
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+                        <h1 id="how-do-state-groups-work"><a class="header" href="#how-do-state-groups-work">How do State Groups work?</a></h1>
+<p>As a general rule, I encourage people who want to understand the deepest darkest secrets of the database schema to drop by #synapse-dev:matrix.org and ask questions.</p>
+<p>However, one question that comes up frequently is that of how &quot;state groups&quot; work, and why the <code>state_groups_state</code> table gets so big, so here's an attempt to answer that question.</p>
+<p>We need to be able to relatively quickly calculate the state of a room at any point in that room's history. In other words, we need to know the state of the room at each event in that room. This is done as follows:</p>
+<p>A sequence of events where the state is the same are grouped together into a <code>state_group</code>; the mapping is recorded in <code>event_to_state_groups</code>. (Technically speaking, since a state event usually changes the state in the room, we are recording the state of the room <em>after</em> the given event id: which is to say, to a handwavey simplification, the first event in a state group is normally a state event, and others in the same state group are normally non-state-events.)</p>
+<p><code>state_groups</code> records, for each state group, the id of the room that we're looking at, and also the id of the first event in that group. (I'm not sure if that event id is used much in practice.) </p>
+<p>Now, if we stored all the room state for each <code>state_group</code>, that would be a huge amount of data. Instead, for each state group, we normally store the difference between the state in that group and some other state group, and only occasionally (every 100 state changes or so) record the full state.</p>
+<p>So, most state groups have an entry in <code>state_group_edges</code> (don't ask me why it's not a column in <code>state_groups</code>) which records the previous state group in the room, and <code>state_groups_state</code> records the differences in state since that previous state group.</p>
+<p>A full state group just records the event id for each piece of state in the room at that point.</p>
+<h2 id="known-bugs-with-state-groups"><a class="header" href="#known-bugs-with-state-groups">Known bugs with state groups</a></h2>
+<p>There are various reasons that we can end up creating many more state groups than we need: see https://github.com/matrix-org/synapse/issues/3364 for more details.</p>
+<h2 id="compression-tool"><a class="header" href="#compression-tool">Compression tool</a></h2>
+<p>There is a tool at https://github.com/matrix-org/rust-synapse-compress-state which can compress the <code>state_groups_state</code> on a room by-room basis (essentially, it reduces the number of &quot;full&quot; state groups). This can result in dramatic reductions of the storage used.</p>
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+                        <h2 id="understanding-synapse-through-grafana-graphs"><a class="header" href="#understanding-synapse-through-grafana-graphs">Understanding Synapse through Grafana graphs</a></h2>
+<p>It is possible to monitor much of the internal state of Synapse using <a href="https://prometheus.io">Prometheus</a> 
+metrics and <a href="https://grafana.com/">Grafana</a>. 
+A guide for configuring Synapse to provide metrics is available <a href="../../metrics-howto.html">here</a> 
+and information on setting up Grafana is <a href="https://github.com/matrix-org/synapse/tree/master/contrib/grafana">here</a>.
+In this setup, Prometheus will periodically scrape the information Synapse provides and
+store a record of it over time. Grafana is then used as an interface to query and
+present this information through a series of pretty graphs.</p>
+<p>Once you have grafana set up, and assuming you're using <a href="https://github.com/matrix-org/synapse/blob/master/contrib/grafana/synapse.json">our grafana dashboard template</a>, look for the following graphs when debugging a slow/overloaded Synapse:</p>
+<h2 id="message-event-send-time"><a class="header" href="#message-event-send-time">Message Event Send Time</a></h2>
+<p><img src="https://user-images.githubusercontent.com/1342360/82239409-a1c8e900-9930-11ea-8081-e4614e0c63f4.png" alt="image" /></p>
+<p>This, along with the CPU and Memory graphs, is a good way to check the general health of your Synapse instance. It represents how long it takes for a user on your homeserver to send a message.</p>
+<h2 id="transaction-count-and-transaction-duration"><a class="header" href="#transaction-count-and-transaction-duration">Transaction Count and Transaction Duration</a></h2>
+<p><img src="https://user-images.githubusercontent.com/1342360/82239985-8d392080-9931-11ea-80d0-843ab2f22e1e.png" alt="image" /></p>
+<p><img src="https://user-images.githubusercontent.com/1342360/82240050-ab068580-9931-11ea-98f1-f94671cbac9a.png" alt="image" /></p>
+<p>These graphs show the database transactions that are occurring the most frequently, as well as those are that are taking the most amount of time to execute.</p>
+<p><img src="https://user-images.githubusercontent.com/1342360/82240192-e86b1300-9931-11ea-9aac-3e2c9bfa6fdc.png" alt="image" /></p>
+<p>In the first graph, we can see obvious spikes corresponding to lots of <code>get_user_by_id</code> transactions. This would be useful information to figure out which part of the Synapse codebase is potentially creating a heavy load on the system. However, be sure to cross-reference this with Transaction Duration, which states that <code>get_users_by_id</code> is actually a very quick database transaction and isn't causing as much load as others, like <code>persist_events</code>:</p>
+<p><img src="https://user-images.githubusercontent.com/1342360/82240467-62030100-9932-11ea-8db9-917f2d977fe1.png" alt="image" /></p>
+<p>Still, it's probably worth investigating why we're getting users from the database that often, and whether it's possible to reduce the amount of queries we make by adjusting our cache factor(s).</p>
+<p>The <code>persist_events</code> transaction is responsible for saving new room events to the Synapse database, so can often show a high transaction duration.</p>
+<h2 id="federation"><a class="header" href="#federation">Federation</a></h2>
+<p>The charts in the &quot;Federation&quot; section show information about incoming and outgoing federation requests. Federation data can be divided into two basic types:</p>
+<ul>
+<li>PDU (Persistent Data Unit) - room events: messages, state events (join/leave), etc. These are permanently stored in the database.</li>
+<li>EDU (Ephemeral Data Unit) - other data, which need not be stored permanently, such as read receipts, typing notifications.</li>
+</ul>
+<p>The &quot;Outgoing EDUs by type&quot; chart shows the EDUs within outgoing federation requests by type: <code>m.device_list_update</code>, <code>m.direct_to_device</code>, <code>m.presence</code>, <code>m.receipt</code>, <code>m.typing</code>.</p>
+<p>If you see a large number of <code>m.presence</code> EDUs and are having trouble with too much CPU load, you can disable <code>presence</code> in the Synapse config. See also <a href="https://github.com/matrix-org/synapse/issues/3971">#3971</a>.</p>
+<h2 id="caches"><a class="header" href="#caches">Caches</a></h2>
+<p><img src="https://user-images.githubusercontent.com/1342360/82240572-8b239180-9932-11ea-96ff-6b5f0e57ebe5.png" alt="image" /></p>
+<p><img src="https://user-images.githubusercontent.com/1342360/82240666-b8703f80-9932-11ea-86af-9f663988d8da.png" alt="image" /></p>
+<p>This is quite a useful graph. It shows how many times Synapse attempts to retrieve a piece of data from a cache which the cache did not contain, thus resulting in a call to the database. We can see here that the <code>_get_joined_profile_from_event_id</code> cache is being requested a lot, and often the data we're after is not cached.</p>
+<p>Cross-referencing this with the Eviction Rate graph, which shows that entries are being evicted from <code>_get_joined_profile_from_event_id</code> quite often:</p>
+<p><img src="https://user-images.githubusercontent.com/1342360/82240766-de95df80-9932-11ea-8c15-5acfc57c48da.png" alt="image" /></p>
+<p>we should probably consider raising the size of that cache by raising its cache factor (a multiplier value for the size of an individual cache). Information on doing so is available <a href="https://github.com/matrix-org/synapse/blob/ee421e524478c1ad8d43741c27379499c2f6135c/docs/sample_config.yaml#L608-L642">here</a> (note that the configuration of individual cache factors through the configuration file is available in Synapse v1.14.0+, whereas doing so through environment variables has been supported for a very long time). Note that this will increase Synapse's overall memory usage.</p>
+<h2 id="forward-extremities"><a class="header" href="#forward-extremities">Forward Extremities</a></h2>
+<p><img src="https://user-images.githubusercontent.com/1342360/82241440-13566680-9934-11ea-8b88-ba468db937ed.png" alt="image" /></p>
+<p>Forward extremities are the leaf events at the end of a DAG in a room, aka events that have no children. The more that exist in a room, the more <a href="https://spec.matrix.org/v1.1/server-server-api/#room-state-resolution">state resolution</a> that Synapse needs to perform (hint: it's an expensive operation). While Synapse has code to prevent too many of these existing at one time in a room, bugs can sometimes make them crop up again.</p>
+<p>If a room has &gt;10 forward extremities, it's worth checking which room is the culprit and potentially removing them using the SQL queries mentioned in <a href="https://github.com/matrix-org/synapse/issues/1760">#1760</a>.</p>
+<h2 id="garbage-collection"><a class="header" href="#garbage-collection">Garbage Collection</a></h2>
+<p><img src="https://user-images.githubusercontent.com/1342360/82241911-da6ac180-9934-11ea-9a0d-a311fe22acd0.png" alt="image" /></p>
+<p>Large spikes in garbage collection times (bigger than shown here, I'm talking in the 
+multiple seconds range), can cause lots of problems in Synapse performance. It's more an 
+indicator of problems, and a symptom of other problems though, so check other graphs for what might be causing it.</p>
+<h2 id="final-thoughts"><a class="header" href="#final-thoughts">Final Thoughts</a></h2>
+<p>If you're still having performance problems with your Synapse instance and you've 
+tried everything you can, it may just be a lack of system resources. Consider adding
+more CPU and RAM, and make use of <a href="../../workers.html">worker mode</a> 
+to make use of multiple CPU cores / multiple machines for your homeserver.</p>
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+
+                        <h2 id="some-useful-sql-queries-for-synapse-admins"><a class="header" href="#some-useful-sql-queries-for-synapse-admins">Some useful SQL queries for Synapse Admins</a></h2>
+<h2 id="size-of-full-matrix-db"><a class="header" href="#size-of-full-matrix-db">Size of full matrix db</a></h2>
+<pre><code class="language-sql">SELECT pg_size_pretty( pg_database_size( 'matrix' ) );
+</code></pre>
+<h3 id="result-example"><a class="header" href="#result-example">Result example:</a></h3>
+<pre><code>pg_size_pretty 
+----------------
+ 6420 MB
+(1 row)
+</code></pre>
+<h2 id="show-top-20-larger-tables-by-row-count"><a class="header" href="#show-top-20-larger-tables-by-row-count">Show top 20 larger tables by row count</a></h2>
+<pre><code class="language-sql">SELECT relname, n_live_tup AS &quot;rows&quot;
+  FROM pg_stat_user_tables
+  ORDER BY n_live_tup DESC
+  LIMIT 20;
+</code></pre>
+<p>This query is quick, but may be very approximate, for exact number of rows use:</p>
+<pre><code class="language-sql">SELECT COUNT(*) FROM &lt;table_name&gt;;
+</code></pre>
+<h3 id="result-example-1"><a class="header" href="#result-example-1">Result example:</a></h3>
+<pre><code>state_groups_state - 161687170
+event_auth - 8584785
+event_edges - 6995633
+event_json - 6585916
+event_reference_hashes - 6580990
+events - 6578879
+received_transactions - 5713989
+event_to_state_groups - 4873377
+stream_ordering_to_exterm - 4136285
+current_state_delta_stream - 3770972
+event_search - 3670521
+state_events - 2845082
+room_memberships - 2785854
+cache_invalidation_stream - 2448218
+state_groups - 1255467
+state_group_edges - 1229849
+current_state_events - 1222905
+users_in_public_rooms - 364059
+device_lists_stream - 326903
+user_directory_search - 316433
+</code></pre>
+<h2 id="show-top-20-larger-tables-by-storage-size"><a class="header" href="#show-top-20-larger-tables-by-storage-size">Show top 20 larger tables by storage size</a></h2>
+<pre><code class="language-sql">SELECT nspname || '.' || relname AS &quot;relation&quot;,
+    pg_size_pretty(pg_total_relation_size(c.oid)) AS &quot;total_size&quot;
+  FROM pg_class c
+  LEFT JOIN pg_namespace n ON (n.oid = c.relnamespace)
+  WHERE nspname NOT IN ('pg_catalog', 'information_schema')
+    AND c.relkind &lt;&gt; 'i'
+    AND nspname !~ '^pg_toast'
+  ORDER BY pg_total_relation_size(c.oid) DESC
+  LIMIT 20;
+</code></pre>
+<h3 id="result-example-2"><a class="header" href="#result-example-2">Result example:</a></h3>
+<pre><code>public.state_groups_state - 27 GB
+public.event_json - 9855 MB
+public.events - 3675 MB
+public.event_edges - 3404 MB
+public.received_transactions - 2745 MB
+public.event_reference_hashes - 1864 MB
+public.event_auth - 1775 MB
+public.stream_ordering_to_exterm - 1663 MB
+public.event_search - 1370 MB
+public.room_memberships - 1050 MB
+public.event_to_state_groups - 948 MB
+public.current_state_delta_stream - 711 MB
+public.state_events - 611 MB
+public.presence_stream - 530 MB
+public.current_state_events - 525 MB
+public.cache_invalidation_stream - 466 MB
+public.receipts_linearized - 279 MB
+public.state_groups - 160 MB
+public.device_lists_remote_cache - 124 MB
+public.state_group_edges - 122 MB
+</code></pre>
+<h2 id="show-top-20-larger-rooms-by-state-events-count"><a class="header" href="#show-top-20-larger-rooms-by-state-events-count">Show top 20 larger rooms by state events count</a></h2>
+<p>You get the same information when you use the
+<a href="../../admin_api/rooms.html#list-room-api">admin API</a>
+and set parameter <code>order_by=state_events</code>.</p>
+<pre><code class="language-sql">SELECT r.name, s.room_id, s.current_state_events
+  FROM room_stats_current s
+  LEFT JOIN room_stats_state r USING (room_id)
+  ORDER BY current_state_events DESC
+  LIMIT 20;
+</code></pre>
+<p>and by state_group_events count:</p>
+<pre><code class="language-sql">SELECT rss.name, s.room_id, COUNT(s.room_id)
+  FROM state_groups_state s
+  LEFT JOIN room_stats_state rss USING (room_id)
+  GROUP BY s.room_id, rss.name
+  ORDER BY COUNT(s.room_id) DESC
+  LIMIT 20;
+</code></pre>
+<p>plus same, but with join removed for performance reasons:</p>
+<pre><code class="language-sql">SELECT s.room_id, COUNT(s.room_id)
+  FROM state_groups_state s
+  GROUP BY s.room_id 
+  ORDER BY COUNT(s.room_id) DESC
+  LIMIT 20;
+</code></pre>
+<h2 id="show-top-20-rooms-by-new-events-count-in-last-1-day"><a class="header" href="#show-top-20-rooms-by-new-events-count-in-last-1-day">Show top 20 rooms by new events count in last 1 day:</a></h2>
+<pre><code class="language-sql">SELECT e.room_id, r.name, COUNT(e.event_id) cnt
+  FROM events e
+  LEFT JOIN room_stats_state r USING (room_id)
+  WHERE e.origin_server_ts &gt;= DATE_PART('epoch', NOW() - INTERVAL '1 day') * 1000
+  GROUP BY e.room_id, r.name 
+  ORDER BY cnt DESC
+  LIMIT 20;
+</code></pre>
+<h2 id="show-top-20-users-on-homeserver-by-sent-events-messages-at-last-month"><a class="header" href="#show-top-20-users-on-homeserver-by-sent-events-messages-at-last-month">Show top 20 users on homeserver by sent events (messages) at last month:</a></h2>
+<p>Caution. This query does not use any indexes, can be slow and create load on the database.</p>
+<pre><code class="language-sql">SELECT COUNT(*), sender
+  FROM events
+  WHERE (type = 'm.room.encrypted' OR type = 'm.room.message')
+    AND origin_server_ts &gt;= DATE_PART('epoch', NOW() - INTERVAL '1 month') * 1000
+  GROUP BY sender
+  ORDER BY COUNT(*) DESC
+  LIMIT 20;
+</code></pre>
+<h2 id="show-last-100-messages-from-needed-user-with-room-names"><a class="header" href="#show-last-100-messages-from-needed-user-with-room-names">Show last 100 messages from needed user, with room names:</a></h2>
+<pre><code class="language-sql">SELECT e.room_id, r.name, e.event_id, e.type, e.content, j.json
+  FROM events e
+  LEFT JOIN event_json j USING (room_id)
+  LEFT JOIN room_stats_state r USING (room_id)
+  WHERE sender = '@LOGIN:example.com'
+    AND e.type = 'm.room.message'
+  ORDER BY stream_ordering DESC
+  LIMIT 100;
+</code></pre>
+<h2 id="show-rooms-with-names-sorted-by-events-in-this-rooms"><a class="header" href="#show-rooms-with-names-sorted-by-events-in-this-rooms">Show rooms with names, sorted by events in this rooms</a></h2>
+<p><strong>Sort and order with bash</strong></p>
+<pre><code class="language-bash">echo &quot;SELECT event_json.room_id, room_stats_state.name FROM event_json, room_stats_state \
+WHERE room_stats_state.room_id = event_json.room_id&quot; | psql -d synapse -h localhost -U synapse_user -t \
+| sort | uniq -c | sort -n
+</code></pre>
+<p>Documentation for <code>psql</code> command line parameters: https://www.postgresql.org/docs/current/app-psql.html</p>
+<p><strong>Sort and order with SQL</strong></p>
+<pre><code class="language-sql">SELECT COUNT(*), event_json.room_id, room_stats_state.name
+  FROM event_json, room_stats_state
+  WHERE room_stats_state.room_id = event_json.room_id
+  GROUP BY event_json.room_id, room_stats_state.name
+  ORDER BY COUNT(*) DESC
+  LIMIT 50;
+</code></pre>
+<h3 id="result-example-3"><a class="header" href="#result-example-3">Result example:</a></h3>
+<pre><code>   9459  !FPUfgzXYWTKgIrwKxW:matrix.org              | This Week in Matrix
+   9459  !FPUfgzXYWTKgIrwKxW:matrix.org              | This Week in Matrix (TWIM)
+  17799  !iDIOImbmXxwNngznsa:matrix.org              | Linux in Russian
+  18739  !GnEEPYXUhoaHbkFBNX:matrix.org              | Riot Android
+  23373  !QtykxKocfZaZOUrTwp:matrix.org              | Matrix HQ
+  39504  !gTQfWzbYncrtNrvEkB:matrix.org              | ru.[matrix]
+  43601  !iNmaIQExDMeqdITdHH:matrix.org              | Riot
+  43601  !iNmaIQExDMeqdITdHH:matrix.org              | Riot Web/Desktop
+</code></pre>
+<h2 id="lookup-room-state-info-by-list-of-room_id"><a class="header" href="#lookup-room-state-info-by-list-of-room_id">Lookup room state info by list of room_id</a></h2>
+<p>You get the same information when you use the
+<a href="../../admin_api/rooms.html#room-details-api">admin API</a>.</p>
+<pre><code class="language-sql">SELECT rss.room_id, rss.name, rss.canonical_alias, rss.topic, rss.encryption,
+    rsc.joined_members, rsc.local_users_in_room, rss.join_rules
+  FROM room_stats_state rss
+  LEFT JOIN room_stats_current rsc USING (room_id)
+  WHERE room_id IN ( WHERE room_id IN (
+    '!OGEhHVWSdvArJzumhm:matrix.org',
+    '!YTvKGNlinIzlkMTVRl:matrix.org' 
+  );
+</code></pre>
+<h2 id="show-users-and-devices-that-have-not-been-online-for-a-while"><a class="header" href="#show-users-and-devices-that-have-not-been-online-for-a-while">Show users and devices that have not been online for a while</a></h2>
+<pre><code class="language-sql">SELECT user_id, device_id, user_agent, TO_TIMESTAMP(last_seen / 1000) AS &quot;last_seen&quot;
+  FROM devices
+  WHERE last_seen &lt; DATE_PART('epoch', NOW() - INTERVAL '3 month') * 1000;
+</code></pre>
+
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+                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="../../welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="../../setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="../../postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="../../reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="../../setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="../../turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="../../delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item 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class="chapter-item expanded "><a href="../../modules/porting_legacy_module.html">Porting a legacy module to the new interface</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../../workers.html">Workers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../synctl_workers.html">Using synctl with Workers</a></li><li class="chapter-item expanded "><a href="../../systemd-with-workers/index.html">Systemd</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../../usage/administration/index.html">Administration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../usage/administration/admin_api/index.html">Admin API</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../admin_api/account_validity.html">Account Validity</a></li><li class="chapter-item expanded "><a href="../../usage/administration/admin_api/background_updates.html">Background Updates</a></li><li 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Groups</a></li><li class="chapter-item expanded "><a href="../../usage/administration/request_log.html">Request log format</a></li><li class="chapter-item expanded "><a href="../../usage/administration/admin_faq.html">Admin FAQ</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a href="../../development/contributing_guide.html">Contributing Guide</a></li><li class="chapter-item expanded "><a href="../../code_style.html">Code Style</a></li><li class="chapter-item expanded "><a href="../../development/releases.html">Release Cycle</a></li><li class="chapter-item expanded "><a href="../../development/git.html">Git Usage</a></li><li class="chapter-item expanded "><div>Testing</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../development/demo.html">Demo scripts</a></li></ol></li><li class="chapter-item expanded "><a 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+
+                        <h1 id="configuring-synapse"><a class="header" href="#configuring-synapse">Configuring Synapse</a></h1>
+<p>This is intended as a guide to the Synapse configuration. The behavior of a Synapse instance can be modified 
+through the many configuration settings documented here — each config option is explained, 
+including what the default is, how to change the default and what sort of behaviour the setting governs.
+Also included is an example configuration for each setting. If you don't want to spend a lot of time 
+thinking about options, the config as generated sets sensible defaults for all values. Do note however that the
+database defaults to SQLite, which is not recommended for production usage. You can read more on this subject 
+<a href="../../setup/installation.html#using-postgresql">here</a>.</p>
+<h2 id="config-conventions"><a class="header" href="#config-conventions">Config Conventions</a></h2>
+<p>Configuration options that take a time period can be set using a number
+followed by a letter. Letters have the following meanings:</p>
+<ul>
+<li><code>s</code> = second</li>
+<li><code>m</code> = minute</li>
+<li><code>h</code> = hour</li>
+<li><code>d</code> = day</li>
+<li><code>w</code> = week</li>
+<li><code>y</code> = year</li>
+</ul>
+<p>For example, setting <code>redaction_retention_period: 5m</code> would remove redacted
+messages from the database after 5 minutes, rather than 5 months.</p>
+<p>In addition, configuration options referring to size use the following suffixes:</p>
+<ul>
+<li><code>M</code> = MiB, or 1,048,576 bytes</li>
+<li><code>K</code> = KiB, or 1024 bytes </li>
+</ul>
+<p>For example, setting <code>max_avatar_size: 10M</code> means that Synapse will not accept files larger than 10,485,760 bytes
+for a user avatar. </p>
+<h3 id="yaml"><a class="header" href="#yaml">YAML</a></h3>
+<p>The configuration file is a <a href="https://yaml.org/">YAML</a> file, which means that certain syntax rules
+apply if you want your config file to be read properly. A few helpful things to know:</p>
+<ul>
+<li>
+<p><code>#</code> before any option in the config will comment out that setting and either a default (if available) will 
+be applied or Synapse will ignore the setting. Thus, in example #1 below, the setting will be read and
+applied, but in example #2 the setting will not be read and a default will be applied.</p>
+<p>Example #1:</p>
+<pre><code class="language-yaml">pid_file: DATADIR/homeserver.pid
+</code></pre>
+<p>Example #2:</p>
+<pre><code class="language-yaml">#pid_file: DATADIR/homeserver.pid
+</code></pre>
+</li>
+<li>
+<p>Indentation matters! The indentation before a setting
+will determine whether a given setting is read as part of another
+setting, or considered on its own. Thus, in example #1, the <code>enabled</code> setting
+is read as a sub-option of the <code>presence</code> setting, and will be properly applied.</p>
+<p>However, the lack of indentation before the <code>enabled</code> setting in example #2 means
+that when reading the config, Synapse will consider both <code>presence</code> and <code>enabled</code> as
+different settings. In this case, <code>presence</code> has no value, and thus a default applied, and <code>enabled</code>
+is an option that Synapse doesn't recognize and thus ignores.</p>
+<p>Example #1: </p>
+<pre><code class="language-yaml">presence:
+  enabled: false
+</code></pre>
+<p>Example #2:</p>
+<pre><code class="language-yaml">presence:
+enabled: false
+</code></pre>
+<p>In this manual, all top-level settings (ones with no indentation) are identified 
+at the beginning of their section (i.e. &quot;### <code>example_setting</code>&quot;) and 
+the sub-options, if any, are identified and listed in the body of the section. 
+In addition, each setting has an example of its usage, with the proper indentation
+shown. </p>
+</li>
+</ul>
+<h2 id="contents"><a class="header" href="#contents">Contents</a></h2>
+<p><a href="#modules">Modules</a></p>
+<p><a href="#server">Server</a></p>
+<p><a href="#homeserver-blocking">Homeserver Blocking</a></p>
+<p><a href="#tls">TLS</a></p>
+<p><a href="#federation">Federation</a></p>
+<p><a href="#caching">Caching</a></p>
+<p><a href="#database">Database</a></p>
+<p><a href="#logging">Logging</a></p>
+<p><a href="#ratelimiting">Ratelimiting</a></p>
+<p><a href="#media-store">Media Store</a></p>
+<p><a href="#captcha">Captcha</a></p>
+<p><a href="#turn">TURN</a></p>
+<p><a href="#registration">Registration</a></p>
+<p><a href="#api-configuration">API Configuration</a></p>
+<p><a href="#signing-keys">Signing Keys</a></p>
+<p><a href="#single-sign-on-integration">Single Sign On Integration</a></p>
+<p><a href="#push">Push</a></p>
+<p><a href="#rooms">Rooms</a></p>
+<p><a href="#opentracing">Opentracing</a></p>
+<p><a href="#workers">Workers</a></p>
+<p><a href="#background-updates">Background Updates</a></p>
+<h2 id="modules"><a class="header" href="#modules">Modules</a></h2>
+<p>Server admins can expand Synapse's functionality with external modules.</p>
+<p>See <a href="../../modules/index.html">here</a> for more
+documentation on how to configure or create custom modules for Synapse.</p>
+<hr />
+<h3 id="modules-1"><a class="header" href="#modules-1"><code>modules</code></a></h3>
+<p>Use the <code>module</code> sub-option to add modules under this option to extend functionality. 
+The <code>module</code> setting then has a sub-option, <code>config</code>, which can be used to define some configuration
+for the <code>module</code>.</p>
+<p>Defaults to none.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">modules:
+  - module: my_super_module.MySuperClass
+    config:
+      do_thing: true
+  - module: my_other_super_module.SomeClass
+    config: {}
+</code></pre>
+<hr />
+<h2 id="server"><a class="header" href="#server">Server</a></h2>
+<p>Define your homeserver name and other base options.</p>
+<hr />
+<h3 id="server_name"><a class="header" href="#server_name"><code>server_name</code></a></h3>
+<p>This sets the public-facing domain of the server.</p>
+<p>The <code>server_name</code> name will appear at the end of usernames and room addresses
+created on your server. For example if the <code>server_name</code> was example.com,
+usernames on your server would be in the format <code>@user:example.com</code></p>
+<p>In most cases you should avoid using a matrix specific subdomain such as
+matrix.example.com or synapse.example.com as the <code>server_name</code> for the same
+reasons you wouldn't use user@email.example.com as your email address.
+See <a href="../../delegate.html">here</a>
+for information on how to host Synapse on a subdomain while preserving
+a clean <code>server_name</code>.</p>
+<p>The <code>server_name</code> cannot be changed later so it is important to
+configure this correctly before you start Synapse. It should be all
+lowercase and may contain an explicit port.</p>
+<p>There is no default for this option. </p>
+<p>Example configuration #1:</p>
+<pre><code class="language-yaml">server_name: matrix.org 
+</code></pre>
+<p>Example configuration #2:</p>
+<pre><code class="language-yaml">server_name: localhost:8080
+</code></pre>
+<hr />
+<h3 id="pid_file"><a class="header" href="#pid_file"><code>pid_file</code></a></h3>
+<p>When running Synapse as a daemon, the file to store the pid in. Defaults to none.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">pid_file: DATADIR/homeserver.pid
+</code></pre>
+<hr />
+<h3 id="web_client_location"><a class="header" href="#web_client_location"><code>web_client_location</code></a></h3>
+<p>The absolute URL to the web client which <code>/</code> will redirect to. Defaults to none. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">web_client_location: https://riot.example.com/
+</code></pre>
+<hr />
+<h3 id="public_baseurl"><a class="header" href="#public_baseurl"><code>public_baseurl</code></a></h3>
+<p>The public-facing base URL that clients use to access this Homeserver (not
+including _matrix/...). This is the same URL a user might enter into the
+'Custom Homeserver URL' field on their client. If you use Synapse with a
+reverse proxy, this should be the URL to reach Synapse via the proxy.
+Otherwise, it should be the URL to reach Synapse's client HTTP listener (see
+'listeners' below).</p>
+<p>Defaults to <code>https://&lt;server_name&gt;/</code>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">public_baseurl: https://example.com/
+</code></pre>
+<hr />
+<h3 id="serve_server_wellknown"><a class="header" href="#serve_server_wellknown"><code>serve_server_wellknown</code></a></h3>
+<p>By default, other servers will try to reach our server on port 8448, which can
+be inconvenient in some environments.</p>
+<p>Provided <code>https://&lt;server_name&gt;/</code> on port 443 is routed to Synapse, this
+option configures Synapse to serve a file at <code>https://&lt;server_name&gt;/.well-known/matrix/server</code>. 
+This will tell other servers to send traffic to port 443 instead.</p>
+<p>This option currently defaults to false.</p>
+<p>See https://matrix-org.github.io/synapse/latest/delegate.html for more
+information.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">serve_server_wellknown: true
+</code></pre>
+<hr />
+<h3 id="extra_well_known_client_content"><a class="header" href="#extra_well_known_client_content"><code>extra_well_known_client_content </code></a></h3>
+<p>This option allows server runners to add arbitrary key-value pairs to the <a href="https://spec.matrix.org/latest/client-server-api/#well-known-uri">client-facing <code>.well-known</code> response</a>.
+Note that the <code>public_baseurl</code> config option must be provided for Synapse to serve a response to <code>/.well-known/matrix/client</code> at all.</p>
+<p>If this option is provided, it parses the given yaml to json and 
+serves it on <code>/.well-known/matrix/client</code> endpoint
+alongside the standard properties.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">extra_well_known_client_content : 
+  option1: value1
+  option2: value2
+</code></pre>
+<hr />
+<h3 id="soft_file_limit"><a class="header" href="#soft_file_limit"><code>soft_file_limit</code></a></h3>
+<p>Set the soft limit on the number of file descriptors synapse can use.
+Zero is used to indicate synapse should set the soft limit to the hard limit.
+Defaults to 0. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">soft_file_limit: 3
+</code></pre>
+<hr />
+<h3 id="presence"><a class="header" href="#presence"><code>presence</code></a></h3>
+<p>Presence tracking allows users to see the state (e.g online/offline)
+of other local and remote users. Set the <code>enabled</code> sub-option to false to<br />
+disable presence tracking on this homeserver. Defaults to true. 
+This option replaces the previous top-level 'use_presence' option.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">presence:
+  enabled: false
+</code></pre>
+<hr />
+<h3 id="require_auth_for_profile_requests"><a class="header" href="#require_auth_for_profile_requests"><code>require_auth_for_profile_requests</code></a></h3>
+<p>Whether to require authentication to retrieve profile data (avatars, display names) of other 
+users through the client API. Defaults to false. Note that profile data is also available 
+via the federation API, unless <code>allow_profile_lookup_over_federation</code> is set to false.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">require_auth_for_profile_requests: true
+</code></pre>
+<hr />
+<h3 id="limit_profile_requests_to_users_who_share_rooms"><a class="header" href="#limit_profile_requests_to_users_who_share_rooms"><code>limit_profile_requests_to_users_who_share_rooms</code></a></h3>
+<p>Use this option to require a user to share a room with another user in order
+to retrieve their profile information. Only checked on Client-Server 
+requests. Profile requests from other servers should be checked by the
+requesting server. Defaults to false.</p>
+<p>Example configuration: </p>
+<pre><code class="language-yaml">limit_profile_requests_to_users_who_share_rooms: true
+</code></pre>
+<hr />
+<h3 id="include_profile_data_on_invite"><a class="header" href="#include_profile_data_on_invite"><code>include_profile_data_on_invite</code></a></h3>
+<p>Use this option to prevent a user's profile data from being retrieved and
+displayed in a room until they have joined it. By default, a user's
+profile data is included in an invite event, regardless of the values
+of the above two settings, and whether or not the users share a server.
+Defaults to true.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">include_profile_data_on_invite: false
+</code></pre>
+<hr />
+<h3 id="allow_public_rooms_without_auth"><a class="header" href="#allow_public_rooms_without_auth"><code>allow_public_rooms_without_auth</code></a></h3>
+<p>If set to true, removes the need for authentication to access the server's
+public rooms directory through the client API, meaning that anyone can
+query the room directory. Defaults to false.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">allow_public_rooms_without_auth: true
+</code></pre>
+<hr />
+<h3 id="allow_public_rooms_without_auth-1"><a class="header" href="#allow_public_rooms_without_auth-1"><code>allow_public_rooms_without_auth</code></a></h3>
+<p>If set to true, allows any other homeserver to fetch the server's public
+rooms directory via federation. Defaults to false.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">allow_public_rooms_over_federation: true
+</code></pre>
+<hr />
+<h3 id="default_room_version"><a class="header" href="#default_room_version"><code>default_room_version</code></a></h3>
+<p>The default room version for newly created rooms on this server.</p>
+<p>Known room versions are listed <a href="https://spec.matrix.org/latest/rooms/#complete-list-of-room-versions">here</a></p>
+<p>For example, for room version 1, <code>default_room_version</code> should be set
+to &quot;1&quot;. </p>
+<p>Currently defaults to &quot;9&quot;.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">default_room_version: &quot;8&quot;
+</code></pre>
+<hr />
+<h3 id="gc_thresholds"><a class="header" href="#gc_thresholds"><code>gc_thresholds</code></a></h3>
+<p>The garbage collection threshold parameters to pass to <code>gc.set_threshold</code>, if defined.
+Defaults to none. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">gc_thresholds: [700, 10, 10]
+</code></pre>
+<hr />
+<h3 id="gc_min_interval"><a class="header" href="#gc_min_interval"><code>gc_min_interval</code></a></h3>
+<p>The minimum time in seconds between each GC for a generation, regardless of
+the GC thresholds. This ensures that we don't do GC too frequently. A value of <code>[1s, 10s, 30s]</code> 
+indicates that a second must pass between consecutive generation 0 GCs, etc.</p>
+<p>Defaults to <code>[1s, 10s, 30s]</code>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">gc_min_interval: [0.5s, 30s, 1m]
+</code></pre>
+<hr />
+<h3 id="filter_timeline_limit"><a class="header" href="#filter_timeline_limit"><code>filter_timeline_limit</code></a></h3>
+<p>Set the limit on the returned events in the timeline in the get
+and sync operations. Defaults to 100. A value of -1 means no upper limit.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">filter_timeline_limit: 5000
+</code></pre>
+<hr />
+<h3 id="block_non_admin_invites"><a class="header" href="#block_non_admin_invites"><code>block_non_admin_invites</code></a></h3>
+<p>Whether room invites to users on this server should be blocked
+(except those sent by local server admins). Defaults to false.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">block_non_admin_invites: true
+</code></pre>
+<hr />
+<h3 id="enable_search"><a class="header" href="#enable_search"><code>enable_search</code></a></h3>
+<p>If set to false, new messages will not be indexed for searching and users
+will receive errors when searching for messages. Defaults to true.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">enable_search: false
+</code></pre>
+<hr />
+<h3 id="ip_range_blacklist"><a class="header" href="#ip_range_blacklist"><code>ip_range_blacklist</code></a></h3>
+<p>This option prevents outgoing requests from being sent to the specified blacklisted IP address
+CIDR ranges. If this option is not specified then it defaults to private IP
+address ranges (see the example below).</p>
+<p>The blacklist applies to the outbound requests for federation, identity servers,
+push servers, and for checking key validity for third-party invite events.</p>
+<p>(0.0.0.0 and :: are always blacklisted, whether or not they are explicitly
+listed here, since they correspond to unroutable addresses.)</p>
+<p>This option replaces <code>federation_ip_range_blacklist</code> in Synapse v1.25.0.</p>
+<p>Note: The value is ignored when an HTTP proxy is in use.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">ip_range_blacklist:
+  - '127.0.0.0/8'
+  - '10.0.0.0/8'
+  - '172.16.0.0/12'
+  - '192.168.0.0/16'
+  - '100.64.0.0/10'
+  - '192.0.0.0/24'
+  - '169.254.0.0/16'
+  - '192.88.99.0/24'
+  - '198.18.0.0/15'
+  - '192.0.2.0/24'
+  - '198.51.100.0/24'
+  - '203.0.113.0/24'
+  - '224.0.0.0/4'
+  - '::1/128'
+  - 'fe80::/10'
+  - 'fc00::/7'
+  - '2001:db8::/32'
+  - 'ff00::/8'
+  - 'fec0::/10'
+</code></pre>
+<hr />
+<h3 id="ip_range_whitelist"><a class="header" href="#ip_range_whitelist"><code>ip_range_whitelist</code></a></h3>
+<p>List of IP address CIDR ranges that should be allowed for federation,
+identity servers, push servers, and for checking key validity for
+third-party invite events. This is useful for specifying exceptions to
+wide-ranging blacklisted target IP ranges - e.g. for communication with
+a push server only visible in your network.</p>
+<p>This whitelist overrides <code>ip_range_blacklist</code> and defaults to an empty
+list.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">ip_range_whitelist:
+   - '192.168.1.1'
+</code></pre>
+<hr />
+<h3 id="listeners"><a class="header" href="#listeners"><code>listeners</code></a></h3>
+<p>List of ports that Synapse should listen on, their purpose and their
+configuration.</p>
+<p>Sub-options for each listener include:</p>
+<ul>
+<li>
+<p><code>port</code>: the TCP port to bind to. </p>
+</li>
+<li>
+<p><code>bind_addresses</code>: a list of local addresses to listen on. The default is
+'all local interfaces'.</p>
+</li>
+<li>
+<p><code>type</code>: the type of listener. Normally <code>http</code>, but other valid options are:</p>
+<ul>
+<li>
+<p><code>manhole</code>: (see the docs <a href="../../manhole.html">here</a>),</p>
+</li>
+<li>
+<p><code>metrics</code>: (see the docs <a href="../../metrics-howto.html">here</a>),</p>
+</li>
+<li>
+<p><code>replication</code>: (see the docs <a href="../../workers.html">here</a>).</p>
+</li>
+</ul>
+</li>
+<li>
+<p><code>tls</code>: set to true to enable TLS for this listener. Will use the TLS key/cert specified in tls_private_key_path / tls_certificate_path.</p>
+</li>
+<li>
+<p><code>x_forwarded</code>: Only valid for an 'http' listener. Set to true to use the X-Forwarded-For header as the client IP. Useful when Synapse is
+behind a reverse-proxy.</p>
+</li>
+<li>
+<p><code>resources</code>: Only valid for an 'http' listener. A list of resources to host
+on this port. Sub-options for each resource are:</p>
+<ul>
+<li>
+<p><code>names</code>: a list of names of HTTP resources. See below for a list of valid resource names.</p>
+</li>
+<li>
+<p><code>compress</code>: set to true to enable HTTP compression for this resource.</p>
+</li>
+</ul>
+</li>
+<li>
+<p><code>additional_resources</code>: Only valid for an 'http' listener. A map of
+additional endpoints which should be loaded via dynamic modules.</p>
+</li>
+</ul>
+<p>Valid resource names are:</p>
+<ul>
+<li>
+<p><code>client</code>: the client-server API (/_matrix/client), and the synapse admin API (/_synapse/admin). Also implies <code>media</code> and <code>static</code>.</p>
+</li>
+<li>
+<p><code>consent</code>: user consent forms (/_matrix/consent). See <a href="../../consent_tracking.html">here</a> for more.</p>
+</li>
+<li>
+<p><code>federation</code>: the server-server API (/_matrix/federation). Also implies <code>media</code>, <code>keys</code>, <code>openid</code></p>
+</li>
+<li>
+<p><code>keys</code>: the key discovery API (/_matrix/key).</p>
+</li>
+<li>
+<p><code>media</code>: the media API (/_matrix/media).</p>
+</li>
+<li>
+<p><code>metrics</code>: the metrics interface. See <a href="../../metrics-howto.html">here</a>.</p>
+</li>
+<li>
+<p><code>openid</code>: OpenID authentication. See <a href="../../openid.html">here</a>.</p>
+</li>
+<li>
+<p><code>replication</code>: the HTTP replication API (/_synapse/replication). See <a href="../../workers.html">here</a>.</p>
+</li>
+<li>
+<p><code>static</code>: static resources under synapse/static (/_matrix/static). (Mostly useful for 'fallback authentication'.)</p>
+</li>
+</ul>
+<p>Example configuration #1:</p>
+<pre><code class="language-yaml">listeners:
+  # TLS-enabled listener: for when matrix traffic is sent directly to synapse.
+  #
+  # (Note that you will also need to give Synapse a TLS key and certificate: see the TLS section
+  # below.)
+  #
+  - port: 8448
+    type: http
+    tls: true
+    resources:
+      - names: [client, federation]
+</code></pre>
+<p>Example configuration #2:</p>
+<pre><code class="language-yaml">listeners:
+  # Unsecure HTTP listener: for when matrix traffic passes through a reverse proxy
+  # that unwraps TLS.
+  #
+  # If you plan to use a reverse proxy, please see
+  # https://matrix-org.github.io/synapse/latest/reverse_proxy.html.
+  #
+  - port: 8008
+    tls: false
+    type: http
+    x_forwarded: true
+    bind_addresses: ['::1', '127.0.0.1']
+
+    resources:
+      - names: [client, federation]
+        compress: false
+
+    # example additional_resources:
+    additional_resources:
+      &quot;/_matrix/my/custom/endpoint&quot;:
+        module: my_module.CustomRequestHandler
+        config: {}
+
+  # Turn on the twisted ssh manhole service on localhost on the given
+  # port.
+  - port: 9000
+    bind_addresses: ['::1', '127.0.0.1']
+    type: manhole
+</code></pre>
+<hr />
+<h3 id="manhole_settings"><a class="header" href="#manhole_settings"><code>manhole_settings</code></a></h3>
+<p>Connection settings for the manhole. You can find more information
+on the manhole <a href="../../manhole.html">here</a>. Manhole sub-options include:</p>
+<ul>
+<li><code>username</code> : the username for the manhole. This defaults to 'matrix'.</li>
+<li><code>password</code>: The password for the manhole. This defaults to 'rabbithole'.</li>
+<li><code>ssh_priv_key_path</code> and <code>ssh_pub_key_path</code>: The private and public SSH key pair used to encrypt the manhole traffic.
+If these are left unset, then hardcoded and non-secret keys are used,
+which could allow traffic to be intercepted if sent over a public network.</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">manhole_settings:
+  username: manhole
+  password: mypassword
+  ssh_priv_key_path: CONFDIR/id_rsa
+  ssh_pub_key_path: CONFDIR/id_rsa.pub
+</code></pre>
+<hr />
+<h3 id="dummy_events_threshold"><a class="header" href="#dummy_events_threshold"><code>dummy_events_threshold</code></a></h3>
+<p>Forward extremities can build up in a room due to networking delays between
+homeservers. Once this happens in a large room, calculation of the state of
+that room can become quite expensive. To mitigate this, once the number of
+forward extremities reaches a given threshold, Synapse will send an
+<code>org.matrix.dummy_event</code> event, which will reduce the forward extremities
+in the room.</p>
+<p>This setting defines the threshold (i.e. number of forward extremities in the room) at which dummy events are sent. 
+The default value is 10.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">dummy_events_threshold: 5
+</code></pre>
+<hr />
+<p>Config option <code>delete_stale_devices_after</code></p>
+<p>An optional duration. If set, Synapse will run a daily background task to log out and
+delete any device that hasn't been accessed for more than the specified amount of time.</p>
+<p>Defaults to no duration, which means devices are never pruned.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">delete_stale_devices_after: 1y
+</code></pre>
+<h2 id="homeserver-blocking"><a class="header" href="#homeserver-blocking">Homeserver blocking</a></h2>
+<p>Useful options for Synapse admins.</p>
+<hr />
+<h3 id="admin_contact"><a class="header" href="#admin_contact"><code>admin_contact</code></a></h3>
+<p>How to reach the server admin, used in <code>ResourceLimitError</code>. Defaults to none. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">admin_contact: 'mailto:admin@server.com'
+</code></pre>
+<hr />
+<h3 id="hs_disabled-and-hs_disabled_message"><a class="header" href="#hs_disabled-and-hs_disabled_message"><code>hs_disabled</code> and <code>hs_disabled_message</code></a></h3>
+<p>Blocks users from connecting to the homeserver and provides a human-readable reason
+why the connection was blocked. Defaults to false. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">hs_disabled: true
+hs_disabled_message: 'Reason for why the HS is blocked'
+</code></pre>
+<hr />
+<h3 id="limit_usage_by_mau"><a class="header" href="#limit_usage_by_mau"><code>limit_usage_by_mau</code></a></h3>
+<p>This option disables/enables monthly active user blocking. Used in cases where the admin or 
+server owner wants to limit to the number of monthly active users. When enabled and a limit is 
+reached the server returns a <code>ResourceLimitError</code> with error type <code>Codes.RESOURCE_LIMIT_EXCEEDED</code>.
+Defaults to false. If this is enabled, a value for <code>max_mau_value</code> must also be set.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">limit_usage_by_mau: true 
+</code></pre>
+<hr />
+<h3 id="max_mau_value"><a class="header" href="#max_mau_value"><code>max_mau_value</code></a></h3>
+<p>This option sets the hard limit of monthly active users above which the server will start 
+blocking user actions if <code>limit_usage_by_mau</code> is enabled. Defaults to 0.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">max_mau_value: 50
+</code></pre>
+<hr />
+<h3 id="mau_trial_days"><a class="header" href="#mau_trial_days"><code>mau_trial_days</code></a></h3>
+<p>The option <code>mau_trial_days</code> is a means to add a grace period for active users. It
+means that users must be active for the specified number of days before they
+can be considered active and guards against the case where lots of users
+sign up in a short space of time never to return after their initial
+session. Defaults to 0. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">mau_trial_days: 5
+</code></pre>
+<hr />
+<h3 id="mau_appservice_trial_days"><a class="header" href="#mau_appservice_trial_days"><code>mau_appservice_trial_days</code></a></h3>
+<p>The option <code>mau_appservice_trial_days</code> is similar to <code>mau_trial_days</code>, but applies a different
+trial number if the user was registered by an appservice. A value
+of 0 means no trial days are applied. Appservices not listed in this dictionary
+use the value of <code>mau_trial_days</code> instead.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">mau_appservice_trial_days: 
+  my_appservice_id: 3
+  another_appservice_id: 6
+</code></pre>
+<hr />
+<h3 id="mau_limit_alerting"><a class="header" href="#mau_limit_alerting"><code>mau_limit_alerting</code></a></h3>
+<p>The option <code>mau_limit_alerting</code> is a means of limiting client-side alerting
+should the mau limit be reached. This is useful for small instances
+where the admin has 5 mau seats (say) for 5 specific people and no
+interest increasing the mau limit further. Defaults to true, which
+means that alerting is enabled.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">mau_limit_alerting: false
+</code></pre>
+<hr />
+<h3 id="mau_stats_only"><a class="header" href="#mau_stats_only"><code>mau_stats_only</code></a></h3>
+<p>If enabled, the metrics for the number of monthly active users will
+be populated, however no one will be limited based on these numbers. If <code>limit_usage_by_mau</code>
+is true, this is implied to be true. Defaults to false. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">mau_stats_only: true
+</code></pre>
+<hr />
+<h3 id="mau_limit_reserved_threepids"><a class="header" href="#mau_limit_reserved_threepids"><code>mau_limit_reserved_threepids</code></a></h3>
+<p>Sometimes the server admin will want to ensure certain accounts are
+never blocked by mau checking. These accounts are specified by this option.
+Defaults to none. Add accounts by specifying the <code>medium</code> and <code>address</code> of the
+reserved threepid (3rd party identifier).</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">mau_limit_reserved_threepids:
+  - medium: 'email'
+    address: 'reserved_user@example.com'
+</code></pre>
+<hr />
+<h3 id="server_context"><a class="header" href="#server_context"><code>server_context</code></a></h3>
+<p>This option is used by phonehome stats to group together related servers.
+Defaults to none. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">server_context: context
+</code></pre>
+<hr />
+<h3 id="limit_remote_rooms"><a class="header" href="#limit_remote_rooms"><code>limit_remote_rooms</code></a></h3>
+<p>When this option is enabled, the room &quot;complexity&quot; will be checked before a user
+joins a new remote room. If it is above the complexity limit, the server will
+disallow joining, or will instantly leave. This is useful for homeservers that are
+resource-constrained. Options for this setting include:</p>
+<ul>
+<li><code>enabled</code>: whether this check is enabled. Defaults to false.</li>
+<li><code>complexity</code>: the limit above which rooms cannot be joined. The default is 1.0.</li>
+<li><code>complexity_error</code>: override the error which is returned when the room is too complex with a
+custom message. </li>
+<li><code>admins_can_join</code>: allow server admins to join complex rooms. Default is false.</li>
+</ul>
+<p>Room complexity is an arbitrary measure based on factors such as the number of
+users in the room. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">limit_remote_rooms:
+  enabled: true
+  complexity: 0.5
+  complexity_error: &quot;I can't let you do that, Dave.&quot;
+  admins_can_join: true
+</code></pre>
+<hr />
+<h3 id="require_membership_for_aliases"><a class="header" href="#require_membership_for_aliases"><code>require_membership_for_aliases</code></a></h3>
+<p>Whether to require a user to be in the room to add an alias to it.
+Defaults to true.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">require_membership_for_aliases: false
+</code></pre>
+<hr />
+<h3 id="allow_per_room_profiles"><a class="header" href="#allow_per_room_profiles"><code>allow_per_room_profiles</code></a></h3>
+<p>Whether to allow per-room membership profiles through the sending of membership
+events with profile information that differs from the target's global profile.
+Defaults to true.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">allow_per_room_profiles: false
+</code></pre>
+<hr />
+<h3 id="max_avatar_size"><a class="header" href="#max_avatar_size"><code>max_avatar_size</code></a></h3>
+<p>The largest permissible file size in bytes for a user avatar. Defaults to no restriction.
+Use M for MB and K for KB. </p>
+<p>Note that user avatar changes will not work if this is set without using Synapse's media repository.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">max_avatar_size: 10M
+</code></pre>
+<hr />
+<h3 id="allowed_avatar_mimetypes"><a class="header" href="#allowed_avatar_mimetypes"><code>allowed_avatar_mimetypes</code></a></h3>
+<p>The MIME types allowed for user avatars. Defaults to no restriction.</p>
+<p>Note that user avatar changes will not work if this is set without
+using Synapse's media repository.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">allowed_avatar_mimetypes: [&quot;image/png&quot;, &quot;image/jpeg&quot;, &quot;image/gif&quot;]
+</code></pre>
+<hr />
+<h3 id="redaction_retention_period"><a class="header" href="#redaction_retention_period"><code>redaction_retention_period</code></a></h3>
+<p>How long to keep redacted events in unredacted form in the database. After
+this period redacted events get replaced with their redacted form in the DB.</p>
+<p>Defaults to <code>7d</code>. Set to <code>null</code> to disable.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">redaction_retention_period: 28d
+</code></pre>
+<hr />
+<h3 id="user_ips_max_age"><a class="header" href="#user_ips_max_age"><code>user_ips_max_age</code></a></h3>
+<p>How long to track users' last seen time and IPs in the database.</p>
+<p>Defaults to <code>28d</code>. Set to <code>null</code> to disable clearing out of old rows.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">user_ips_max_age: 14d
+</code></pre>
+<hr />
+<h3 id="request_token_inhibit_3pid_errors"><a class="header" href="#request_token_inhibit_3pid_errors"><code>request_token_inhibit_3pid_errors</code></a></h3>
+<p>Inhibits the <code>/requestToken</code> endpoints from returning an error that might leak
+information about whether an e-mail address is in use or not on this
+homeserver. Defaults to false. 
+Note that for some endpoints the error situation is the e-mail already being
+used, and for others the error is entering the e-mail being unused.
+If this option is enabled, instead of returning an error, these endpoints will
+act as if no error happened and return a fake session ID ('sid') to clients.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">request_token_inhibit_3pid_errors: true
+</code></pre>
+<hr />
+<h3 id="next_link_domain_whitelist"><a class="header" href="#next_link_domain_whitelist"><code>next_link_domain_whitelist</code></a></h3>
+<p>A list of domains that the domain portion of <code>next_link</code> parameters
+must match.</p>
+<p>This parameter is optionally provided by clients while requesting
+validation of an email or phone number, and maps to a link that
+users will be automatically redirected to after validation
+succeeds. Clients can make use this parameter to aid the validation
+process.</p>
+<p>The whitelist is applied whether the homeserver or an identity server is handling validation.</p>
+<p>The default value is no whitelist functionality; all domains are
+allowed. Setting this value to an empty list will instead disallow
+all domains.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">next_link_domain_whitelist: [&quot;matrix.org&quot;]
+</code></pre>
+<hr />
+<h3 id="templates-and-custom_template_directory"><a class="header" href="#templates-and-custom_template_directory"><code>templates</code> and <code>custom_template_directory</code></a></h3>
+<p>These options define templates to use when generating email or HTML page contents.
+The <code>custom_template_directory</code> determines which directory Synapse will try to 
+find template files in to use to generate email or HTML page contents.
+If not set, or a file is not found within the template directory, a default 
+template from within the Synapse package will be used.</p>
+<p>See <a href="../../templates.html">here</a> for more
+information about using custom templates.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">templates:
+  custom_template_directory: /path/to/custom/templates/
+</code></pre>
+<hr />
+<h3 id="retention"><a class="header" href="#retention"><code>retention</code></a></h3>
+<p>This option and the associated options determine message retention policy at the
+server level.</p>
+<p>Room admins and mods can define a retention period for their rooms using the
+<code>m.room.retention</code> state event, and server admins can cap this period by setting
+the <code>allowed_lifetime_min</code> and <code>allowed_lifetime_max</code> config options.</p>
+<p>If this feature is enabled, Synapse will regularly look for and purge events
+which are older than the room's maximum retention period. Synapse will also
+filter events received over federation so that events that should have been 
+purged are ignored and not stored again. </p>
+<p>The message retention policies feature is disabled by default.</p>
+<p>This setting has the following sub-options:</p>
+<ul>
+<li>
+<p><code>default_policy</code>: Default retention policy. If set, Synapse will apply it to rooms that lack the
+'m.room.retention' state event. This option is further specified by the 
+<code>min_lifetime</code> and <code>max_lifetime</code> sub-options associated with it. Note that the 
+value of <code>min_lifetime</code> doesn't matter much because Synapse doesn't take it into account yet. </p>
+</li>
+<li>
+<p><code>allowed_lifetime_min</code> and <code>allowed_lifetime_max</code>: Retention policy limits. If 
+set, and the state of a room contains a <code>m.room.retention</code> event in its state 
+which contains a <code>min_lifetime</code> or a <code>max_lifetime</code> that's out of these bounds,
+Synapse will cap the room's policy to these limits when running purge jobs.</p>
+</li>
+<li>
+<p><code>purge_jobs</code> and the associated <code>shortest_max_lifetime</code> and <code>longest_max_lifetime</code> sub-options:
+Server admins can define the settings of the background jobs purging the
+events whose lifetime has expired under the <code>purge_jobs</code> section.</p>
+<p>If no configuration is provided for this option, a single job will be set up to delete
+expired events in every room daily.</p>
+<p>Each job's configuration defines which range of message lifetimes the job
+takes care of. For example, if <code>shortest_max_lifetime</code> is '2d' and
+<code>longest_max_lifetime</code> is '3d', the job will handle purging expired events in
+rooms whose state defines a <code>max_lifetime</code> that's both higher than 2 days, and
+lower than or equal to 3 days. Both the minimum and the maximum value of a
+range are optional, e.g. a job with no <code>shortest_max_lifetime</code> and a
+<code>longest_max_lifetime</code> of '3d' will handle every room with a retention policy
+whose <code>max_lifetime</code> is lower than or equal to three days.</p>
+<p>The rationale for this per-job configuration is that some rooms might have a
+retention policy with a low <code>max_lifetime</code>, where history needs to be purged
+of outdated messages on a more frequent basis than for the rest of the rooms
+(e.g. every 12h), but not want that purge to be performed by a job that's
+iterating over every room it knows, which could be heavy on the server.</p>
+<p>If any purge job is configured, it is strongly recommended to have at least
+a single job with neither <code>shortest_max_lifetime</code> nor <code>longest_max_lifetime</code>
+set, or one job without <code>shortest_max_lifetime</code> and one job without
+<code>longest_max_lifetime</code> set. Otherwise some rooms might be ignored, even if
+<code>allowed_lifetime_min</code> and <code>allowed_lifetime_max</code> are set, because capping a
+room's policy to these values is done after the policies are retrieved from
+Synapse's database (which is done using the range specified in a purge job's
+configuration).</p>
+</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">retention:
+  enabled: true
+  default_policy:
+    min_lifetime: 1d
+    max_lifetime: 1y
+  allowed_lifetime_min: 1d
+  allowed_lifetime_max: 1y
+  purge_jobs:
+    - longest_max_lifetime: 3d
+      interval: 12h
+    - shortest_max_lifetime: 3d
+      interval: 1d  
+</code></pre>
+<hr />
+<h2 id="tls"><a class="header" href="#tls">TLS</a></h2>
+<p>Options related to TLS.</p>
+<hr />
+<h3 id="tls_certificate_path"><a class="header" href="#tls_certificate_path"><code>tls_certificate_path</code></a></h3>
+<p>This option specifies a PEM-encoded X509 certificate for TLS.
+This certificate, as of Synapse 1.0, will need to be a valid and verifiable
+certificate, signed by a recognised Certificate Authority. Defaults to none. </p>
+<p>Be sure to use a <code>.pem</code> file that includes the full certificate chain including
+any intermediate certificates (for instance, if using certbot, use
+<code>fullchain.pem</code> as your certificate, not <code>cert.pem</code>). </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">tls_certificate_path: &quot;CONFDIR/SERVERNAME.tls.crt&quot;
+</code></pre>
+<hr />
+<h3 id="tls_private_key_path"><a class="header" href="#tls_private_key_path"><code>tls_private_key_path</code></a></h3>
+<p>PEM-encoded private key for TLS. Defaults to none. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">tls_private_key_path: &quot;CONFDIR/SERVERNAME.tls.key&quot;
+</code></pre>
+<hr />
+<h3 id="federation_verify_certificates"><a class="header" href="#federation_verify_certificates"><code>federation_verify_certificates</code></a></h3>
+<p>Whether to verify TLS server certificates for outbound federation requests.</p>
+<p>Defaults to true. To disable certificate verification, set the option to false.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">federation_verify_certificates: false
+</code></pre>
+<hr />
+<h3 id="federation_client_minimum_tls_version"><a class="header" href="#federation_client_minimum_tls_version"><code>federation_client_minimum_tls_version</code></a></h3>
+<p>The minimum TLS version that will be used for outbound federation requests.</p>
+<p>Defaults to <code>1</code>. Configurable to <code>1</code>, <code>1.1</code>, <code>1.2</code>, or <code>1.3</code>. Note
+that setting this value higher than <code>1.2</code> will prevent federation to most
+of the public Matrix network: only configure it to <code>1.3</code> if you have an
+entirely private federation setup and you can ensure TLS 1.3 support.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">federation_client_minimum_tls_version: 1.2
+</code></pre>
+<hr />
+<h3 id="federation_certificate_verification_whitelist"><a class="header" href="#federation_certificate_verification_whitelist"><code>federation_certificate_verification_whitelist</code></a></h3>
+<p>Skip federation certificate verification on a given whitelist
+of domains.</p>
+<p>This setting should only be used in very specific cases, such as
+federation over Tor hidden services and similar. For private networks
+of homeservers, you likely want to use a private CA instead.</p>
+<p>Only effective if <code>federation_verify_certicates</code> is <code>true</code>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">federation_certificate_verification_whitelist:
+  - lon.example.com
+  - &quot;*.domain.com&quot;
+  - &quot;*.onion&quot;
+</code></pre>
+<hr />
+<h3 id="federation_custom_ca_list"><a class="header" href="#federation_custom_ca_list"><code>federation_custom_ca_list</code></a></h3>
+<p>List of custom certificate authorities for federation traffic.</p>
+<p>This setting should only normally be used within a private network of
+homeservers.</p>
+<p>Note that this list will replace those that are provided by your
+operating environment. Certificates must be in PEM format.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">federation_custom_ca_list:
+  - myCA1.pem
+  - myCA2.pem
+  - myCA3.pem
+</code></pre>
+<hr />
+<h2 id="federation"><a class="header" href="#federation">Federation</a></h2>
+<p>Options related to federation.</p>
+<hr />
+<h3 id="federation_domain_whitelist"><a class="header" href="#federation_domain_whitelist"><code>federation_domain_whitelist</code></a></h3>
+<p>Restrict federation to the given whitelist of domains.
+N.B. we recommend also firewalling your federation listener to limit
+inbound federation traffic as early as possible, rather than relying
+purely on this application-layer restriction.  If not specified, the
+default is to whitelist everything.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">federation_domain_whitelist:
+  - lon.example.com
+  - nyc.example.com
+  - syd.example.com
+</code></pre>
+<hr />
+<h3 id="federation_metrics_domains"><a class="header" href="#federation_metrics_domains"><code>federation_metrics_domains</code></a></h3>
+<p>Report prometheus metrics on the age of PDUs being sent to and received from
+the given domains. This can be used to give an idea of &quot;delay&quot; on inbound
+and outbound federation, though be aware that any delay can be due to problems
+at either end or with the intermediate network.</p>
+<p>By default, no domains are monitored in this way.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">federation_metrics_domains:
+  - matrix.org
+  - example.com
+</code></pre>
+<hr />
+<h3 id="allow_profile_lookup_over_federation"><a class="header" href="#allow_profile_lookup_over_federation"><code>allow_profile_lookup_over_federation</code></a></h3>
+<p>Set to false to disable profile lookup over federation. By default, the
+Federation API allows other homeservers to obtain profile data of any user
+on this homeserver.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">allow_profile_lookup_over_federation: false
+</code></pre>
+<hr />
+<h3 id="allow_device_name_lookup_over_federation"><a class="header" href="#allow_device_name_lookup_over_federation"><code>allow_device_name_lookup_over_federation</code></a></h3>
+<p>Set this option to true to allow device display name lookup over federation. By default, the
+Federation API prevents other homeservers from obtaining the display names of any user devices
+on this homeserver.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">allow_device_name_lookup_over_federation: true
+</code></pre>
+<hr />
+<h2 id="caching"><a class="header" href="#caching">Caching</a></h2>
+<p>Options related to caching</p>
+<hr />
+<h3 id="event_cache_size"><a class="header" href="#event_cache_size"><code>event_cache_size</code></a></h3>
+<p>The number of events to cache in memory. Not affected by
+<code>caches.global_factor</code>. Defaults to 10K.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">event_cache_size: 15K
+</code></pre>
+<hr />
+<h3 id="cache-and-associated-values"><a class="header" href="#cache-and-associated-values"><code>cache</code> and associated values</a></h3>
+<p>A cache 'factor' is a multiplier that can be applied to each of
+Synapse's caches in order to increase or decrease the maximum
+number of entries that can be stored.</p>
+<p>Caching can be configured through the following sub-options:</p>
+<ul>
+<li>
+<p><code>global_factor</code>: Controls the global cache factor, which is the default cache factor
+for all caches if a specific factor for that cache is not otherwise
+set.</p>
+<p>This can also be set by the <code>SYNAPSE_CACHE_FACTOR</code> environment
+variable. Setting by environment variable takes priority over
+setting through the config file.</p>
+<p>Defaults to 0.5, which will halve the size of all caches.</p>
+</li>
+<li>
+<p><code>per_cache_factors</code>: A dictionary of cache name to cache factor for that individual
+cache. Overrides the global cache factor for a given cache.</p>
+<p>These can also be set through environment variables comprised
+of <code>SYNAPSE_CACHE_FACTOR_</code> + the name of the cache in capital
+letters and underscores. Setting by environment variable
+takes priority over setting through the config file.
+Ex. <code>SYNAPSE_CACHE_FACTOR_GET_USERS_WHO_SHARE_ROOM_WITH_USER=2.0</code></p>
+<p>Some caches have '*' and other characters that are not
+alphanumeric or underscores. These caches can be named with or
+without the special characters stripped. For example, to specify
+the cache factor for <code>*stateGroupCache*</code> via an environment
+variable would be <code>SYNAPSE_CACHE_FACTOR_STATEGROUPCACHE=2.0</code>.</p>
+</li>
+<li>
+<p><code>expire_caches</code>: Controls whether cache entries are evicted after a specified time
+period. Defaults to true. Set to false to disable this feature. Note that never expiring
+caches may result in excessive memory usage. </p>
+</li>
+<li>
+<p><code>cache_entry_ttl</code>: If <code>expire_caches</code> is enabled, this flag controls how long an entry can
+be in a cache without having been accessed before being evicted.
+Defaults to 30m. </p>
+</li>
+<li>
+<p><code>sync_response_cache_duration</code>: Controls how long the results of a /sync request are
+cached for after a successful response is returned. A higher duration can help clients
+with intermittent connections, at the cost of higher memory usage.
+A value of zero means that sync responses are not cached.
+Defaults to 2m.</p>
+</li>
+<li>
+<p><code>cache_autotuning</code> and its sub-options <code>max_cache_memory_usage</code>, <code>target_cache_memory_usage</code>, and
+<code>min_cache_ttl</code> work in conjunction with each other to maintain a balance between cache memory 
+usage and cache entry availability. You must be using <a href="https://github.com/matrix-org/synapse#help-synapse-is-slow-and-eats-all-my-ramcpu">jemalloc</a> 
+to utilize this option, and all three of the options must be specified for this feature to work. This option
+defaults to off, enable it by providing values for the sub-options listed below. Please note that the feature will not work
+and may cause unstable behavior (such as excessive emptying of caches or exceptions) if all of the values are not provided.
+Please see the <a href="#config-conventions">Config Conventions</a> for information on how to specify memory size and cache expiry
+durations.</p>
+<ul>
+<li><code>max_cache_memory_usage</code> sets a ceiling on how much memory the cache can use before caches begin to be continuously evicted.
+They will continue to be evicted until the memory usage drops below the <code>target_memory_usage</code>, set in
+the setting below, or until the <code>min_cache_ttl</code> is hit. There is no default value for this option.</li>
+<li><code>target_memory_usage</code> sets a rough target for the desired memory usage of the caches. There is no default value
+for this option.</li>
+<li><code>min_cache_ttl</code> sets a limit under which newer cache entries are not evicted and is only applied when
+caches are actively being evicted/<code>max_cache_memory_usage</code> has been exceeded. This is to protect hot caches
+from being emptied while Synapse is evicting due to memory. There is no default value for this option. </li>
+</ul>
+</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">caches:
+  global_factor: 1.0
+  per_cache_factors:
+    get_users_who_share_room_with_user: 2.0
+  sync_response_cache_duration: 2m
+  cache_autotuning:
+    max_cache_memory_usage: 1024M
+    target_cache_memory_usage: 758M
+    min_cache_ttl: 5m
+</code></pre>
+<h3 id="reloading-cache-factors"><a class="header" href="#reloading-cache-factors">Reloading cache factors</a></h3>
+<p>The cache factors (i.e. <code>caches.global_factor</code> and <code>caches.per_cache_factors</code>)  may be reloaded at any time by sending a
+<a href="https://en.wikipedia.org/wiki/SIGHUP"><code>SIGHUP</code></a> signal to Synapse using e.g.</p>
+<pre><code class="language-commandline">kill -HUP [PID_OF_SYNAPSE_PROCESS]
+</code></pre>
+<p>If you are running multiple workers, you must individually update the worker 
+config file and send this signal to each worker process.</p>
+<p>If you're using the <a href="https://github.com/matrix-org/synapse/blob/develop/contrib/systemd/matrix-synapse.service">example systemd service</a>
+file in Synapse's <code>contrib</code> directory, you can send a <code>SIGHUP</code> signal by using
+<code>systemctl reload matrix-synapse</code>.</p>
+<hr />
+<h2 id="database"><a class="header" href="#database">Database</a></h2>
+<p>Config options related to database settings.</p>
+<hr />
+<h3 id="database-1"><a class="header" href="#database-1"><code>database</code></a></h3>
+<p>The <code>database</code> setting defines the database that synapse uses to store all of
+its data.</p>
+<p>Associated sub-options:</p>
+<ul>
+<li>
+<p><code>name</code>: this option specifies the database engine to use: either <code>sqlite3</code> (for SQLite)
+or <code>psycopg2</code> (for PostgreSQL). If no name is specified Synapse will default to SQLite. </p>
+</li>
+<li>
+<p><code>txn_limit</code> gives the maximum number of transactions to run per connection
+before reconnecting. Defaults to 0, which means no limit.</p>
+</li>
+<li>
+<p><code>allow_unsafe_locale</code> is an option specific to Postgres. Under the default behavior, Synapse will refuse to
+start if the postgres db is set to a non-C locale. You can override this behavior (which is <em>not</em> recommended)
+by setting <code>allow_unsafe_locale</code> to true. Note that doing so may corrupt your database. You can find more information
+<a href="../../postgres.html#fixing-incorrect-collate-or-ctype">here</a> and <a href="https://wiki.postgresql.org/wiki/Locale_data_changes">here</a>.</p>
+</li>
+<li>
+<p><code>args</code> gives options which are passed through to the database engine,
+except for options starting with <code>cp_</code>, which are used to configure the Twisted
+connection pool. For a reference to valid arguments, see:</p>
+<ul>
+<li>for <a href="https://docs.python.org/3/library/sqlite3.html#sqlite3.connect">sqlite</a></li>
+<li>for <a href="https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-PARAMKEYWORDS">postgres</a></li>
+<li>for <a href="https://twistedmatrix.com/documents/current/api/twisted.enterprise.adbapi.ConnectionPool.html#__init__">the connection pool</a></li>
+</ul>
+</li>
+</ul>
+<p>For more information on using Synapse with Postgres,
+see <a href="../../postgres.html">here</a>.</p>
+<p>Example SQLite configuration:</p>
+<pre><code class="language-yaml">database:
+  name: sqlite3
+  args:
+    database: /path/to/homeserver.db
+</code></pre>
+<p>Example Postgres configuration:</p>
+<pre><code class="language-yaml">database:
+  name: psycopg2
+  txn_limit: 10000
+  args:
+    user: synapse_user
+    password: secretpassword
+    database: synapse
+    host: localhost
+    port: 5432
+    cp_min: 5
+    cp_max: 10
+</code></pre>
+<hr />
+<h2 id="logging"><a class="header" href="#logging">Logging</a></h2>
+<p>Config options related to logging. </p>
+<hr />
+<h3 id="log_config"><a class="header" href="#log_config"><code>log_config</code></a></h3>
+<p>This option specifies a yaml python logging config file as described <a href="https://docs.python.org/3.7/library/logging.config.html#configuration-dictionary-schema">here</a>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">log_config: &quot;CONFDIR/SERVERNAME.log.config&quot;
+</code></pre>
+<hr />
+<h2 id="ratelimiting"><a class="header" href="#ratelimiting">Ratelimiting</a></h2>
+<p>Options related to ratelimiting in Synapse. </p>
+<p>Each ratelimiting configuration is made of two parameters:</p>
+<ul>
+<li><code>per_second</code>: number of requests a client can send per second.</li>
+<li><code>burst_count</code>: number of requests a client can send before being throttled.</li>
+</ul>
+<hr />
+<h3 id="rc_message"><a class="header" href="#rc_message"><code>rc_message</code></a></h3>
+<p>Ratelimiting settings for client messaging.</p>
+<p>This is a ratelimiting option for messages that ratelimits sending based on the account the client
+is using. It defaults to: <code>per_second: 0.2</code>, <code>burst_count: 10</code>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">rc_message:
+  per_second: 0.5
+  burst_count: 15
+</code></pre>
+<hr />
+<h3 id="rc_registration"><a class="header" href="#rc_registration"><code>rc_registration</code></a></h3>
+<p>This option ratelimits registration requests based on the client's IP address.
+It defaults to <code>per_second: 0.17</code>, <code>burst_count: 3</code>. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">rc_registration:
+  per_second: 0.15
+  burst_count: 2
+</code></pre>
+<hr />
+<h3 id="rc_registration_token_validity"><a class="header" href="#rc_registration_token_validity"><code>rc_registration_token_validity</code></a></h3>
+<p>This option checks the validity of registration tokens that ratelimits requests based on 
+the client's IP address.
+Defaults to <code>per_second: 0.1</code>, <code>burst_count: 5</code>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">rc_registration_token_validity:
+  per_second: 0.3
+  burst_count: 6
+</code></pre>
+<hr />
+<h3 id="rc_login"><a class="header" href="#rc_login"><code>rc_login</code></a></h3>
+<p>This option specifies several limits for login:</p>
+<ul>
+<li>
+<p><code>address</code> ratelimits login requests based on the client's IP
+address. Defaults to <code>per_second: 0.17</code>, <code>burst_count: 3</code>.</p>
+</li>
+<li>
+<p><code>account</code> ratelimits login requests based on the account the
+client is attempting to log into. Defaults to <code>per_second: 0.17</code>,
+<code>burst_count: 3</code>.</p>
+</li>
+<li>
+<p><code>failted_attempts</code> ratelimits login requests based on the account the
+client is attempting to log into, based on the amount of failed login
+attempts for this account. Defaults to <code>per_second: 0.17</code>, <code>burst_count: 3</code>.</p>
+</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">rc_login:
+  address:
+    per_second: 0.15
+    burst_count: 5
+  account:
+    per_second: 0.18
+    burst_count: 4
+  failed_attempts:
+    per_second: 0.19
+    burst_count: 7
+</code></pre>
+<hr />
+<h3 id="rc_admin_redaction"><a class="header" href="#rc_admin_redaction"><code>rc_admin_redaction</code></a></h3>
+<p>This option sets ratelimiting redactions by room admins. If this is not explicitly 
+set then it uses the same ratelimiting as per <code>rc_message</code>. This is useful
+to allow room admins to deal with abuse quickly. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">rc_admin_redaction:
+  per_second: 1
+  burst_count: 50
+</code></pre>
+<hr />
+<h3 id="rc_joins"><a class="header" href="#rc_joins"><code>rc_joins</code></a></h3>
+<p>This option allows for ratelimiting number of rooms a user can join. This setting has the following sub-options:</p>
+<ul>
+<li>
+<p><code>local</code>: ratelimits when users are joining rooms the server is already in. 
+Defaults to <code>per_second: 0.1</code>, <code>burst_count: 10</code>.</p>
+</li>
+<li>
+<p><code>remote</code>: ratelimits when users are trying to join rooms not on the server (which
+can be more computationally expensive than restricting locally). Defaults to
+<code>per_second: 0.01</code>, <code>burst_count: 10</code> </p>
+</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">rc_joins:
+  local:
+    per_second: 0.2
+    burst_count: 15
+  remote:
+    per_second: 0.03
+    burst_count: 12
+</code></pre>
+<hr />
+<h3 id="rc_3pid_validation"><a class="header" href="#rc_3pid_validation"><code>rc_3pid_validation</code></a></h3>
+<p>This option ratelimits how often a user or IP can attempt to validate a 3PID.
+Defaults to <code>per_second: 0.003</code>, <code>burst_count: 5</code>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">rc_3pid_validation:
+  per_second: 0.003
+  burst_count: 5
+</code></pre>
+<hr />
+<h3 id="rc_invites"><a class="header" href="#rc_invites"><code>rc_invites</code></a></h3>
+<p>This option sets ratelimiting how often invites can be sent in a room or to a 
+specific user. <code>per_room</code> defaults to <code>per_second: 0.3</code>, <code>burst_count: 10</code> and
+<code>per_user</code> defaults to <code>per_second: 0.003</code>, <code>burst_count: 5</code>. </p>
+<p>Client requests that invite user(s) when <a href="https://spec.matrix.org/v1.2/client-server-api/#post_matrixclientv3createroom">creating a
+room</a>
+will count against the <code>rc_invites.per_room</code> limit, whereas
+client requests to <a href="https://spec.matrix.org/v1.2/client-server-api/#post_matrixclientv3roomsroomidinvite">invite a single user to a
+room</a>
+will count against both the <code>rc_invites.per_user</code> and <code>rc_invites.per_room</code> limits.</p>
+<p>Federation requests to invite a user will count against the <code>rc_invites.per_user</code>
+limit only, as Synapse presumes ratelimiting by room will be done by the sending server.</p>
+<p>The <code>rc_invites.per_user</code> limit applies to the <em>receiver</em> of the invite, rather than the
+sender, meaning that a <code>rc_invite.per_user.burst_count</code> of 5 mandates that a single user
+cannot <em>receive</em> more than a burst of 5 invites at a time.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">rc_invites:
+  per_room:
+    per_second: 0.5
+    burst_count: 5
+  per_user:
+    per_second: 0.004
+    burst_count: 3
+</code></pre>
+<hr />
+<h3 id="rc_third_party_invite"><a class="header" href="#rc_third_party_invite"><code>rc_third_party_invite</code></a></h3>
+<p>This option ratelimits 3PID invites (i.e. invites sent to a third-party ID
+such as an email address or a phone number) based on the account that's
+sending the invite. Defaults to <code>per_second: 0.2</code>, <code>burst_count: 10</code>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">rc_third_party_invite:
+  per_second: 0.2
+  burst_count: 10
+</code></pre>
+<hr />
+<h3 id="rc_federation"><a class="header" href="#rc_federation"><code>rc_federation</code></a></h3>
+<p>Defines limits on federation requests. </p>
+<p>The <code>rc_federation</code> configuration has the following sub-options:</p>
+<ul>
+<li><code>window_size</code>: window size in milliseconds. Defaults to 1000.</li>
+<li><code>sleep_limit</code>: number of federation requests from a single server in
+a window before the server will delay processing the request. Defaults to 10.</li>
+<li><code>sleep_delay</code>: duration in milliseconds to delay processing events
+from remote servers by if they go over the sleep limit. Defaults to 500.</li>
+<li><code>reject_limit</code>: maximum number of concurrent federation requests
+allowed from a single server. Defaults to 50.</li>
+<li><code>concurrent</code>: number of federation requests to concurrently process
+from a single server. Defaults to 3.</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">rc_federation:
+  window_size: 750
+  sleep_limit: 15
+  sleep_delay: 400
+  reject_limit: 40
+  concurrent: 5
+</code></pre>
+<hr />
+<h3 id="federation_rr_transactions_per_room_per_second"><a class="header" href="#federation_rr_transactions_per_room_per_second"><code>federation_rr_transactions_per_room_per_second</code></a></h3>
+<p>Sets outgoing federation transaction frequency for sending read-receipts,
+per-room.</p>
+<p>If we end up trying to send out more read-receipts, they will get buffered up
+into fewer transactions. Defaults to 50. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">federation_rr_transactions_per_room_per_second: 40
+</code></pre>
+<hr />
+<h2 id="media-store"><a class="header" href="#media-store">Media Store</a></h2>
+<p>Config options related to Synapse's media store.</p>
+<hr />
+<h3 id="enable_media_repo"><a class="header" href="#enable_media_repo"><code>enable_media_repo</code></a></h3>
+<p>Enable the media store service in the Synapse master. Defaults to true. 
+Set to false if you are using a separate media store worker.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">enable_media_repo: false
+</code></pre>
+<hr />
+<h3 id="media_store_path"><a class="header" href="#media_store_path"><code>media_store_path</code></a></h3>
+<p>Directory where uploaded images and attachments are stored.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">media_store_path: &quot;DATADIR/media_store&quot;
+</code></pre>
+<hr />
+<h3 id="media_storage_providers"><a class="header" href="#media_storage_providers"><code>media_storage_providers</code></a></h3>
+<p>Media storage providers allow media to be stored in different
+locations. Defaults to none. Associated sub-options are:</p>
+<ul>
+<li><code>module</code>: type of resource, e.g. <code>file_system</code>.</li>
+<li><code>store_local</code>: whether to store newly uploaded local files</li>
+<li><code>store_remote</code>: whether to store newly downloaded local files</li>
+<li><code>store_synchronous</code>: whether to wait for successful storage for local uploads</li>
+<li><code>config</code>: sets a path to the resource through the <code>directory</code> option </li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">media_storage_providers:
+  - module: file_system
+    store_local: false
+    store_remote: false
+    store_synchronous: false
+    config:
+       directory: /mnt/some/other/directory
+</code></pre>
+<hr />
+<h3 id="max_upload_size"><a class="header" href="#max_upload_size"><code>max_upload_size</code></a></h3>
+<p>The largest allowed upload size in bytes.</p>
+<p>If you are using a reverse proxy you may also need to set this value in
+your reverse proxy's config. Defaults to 50M. Notably Nginx has a small max body size by default.
+See <a href="../../reverse_proxy.html">here</a> for more on using a reverse proxy with Synapse. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">max_upload_size: 60M
+</code></pre>
+<hr />
+<h3 id="max_image_pixels"><a class="header" href="#max_image_pixels"><code>max_image_pixels</code></a></h3>
+<p>Maximum number of pixels that will be thumbnailed. Defaults to 32M.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">max_image_pixels: 35M
+</code></pre>
+<hr />
+<h3 id="dynamic_thumbnails"><a class="header" href="#dynamic_thumbnails"><code>dynamic_thumbnails</code></a></h3>
+<p>Whether to generate new thumbnails on the fly to precisely match
+the resolution requested by the client. If true then whenever
+a new resolution is requested by the client the server will
+generate a new thumbnail. If false the server will pick a thumbnail
+from a precalculated list. Defaults to false. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">dynamic_thumbnails: true
+</code></pre>
+<hr />
+<h3 id="thumbnail_sizes"><a class="header" href="#thumbnail_sizes"><code>thumbnail_sizes</code></a></h3>
+<p>List of thumbnails to precalculate when an image is uploaded. Associated sub-options are:</p>
+<ul>
+<li><code>width</code></li>
+<li><code>height</code></li>
+<li><code>method</code>: i.e. <code>crop</code>, <code>scale</code>, etc.</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">thumbnail_sizes:
+  - width: 32
+    height: 32
+    method: crop
+  - width: 96
+    height: 96
+    method: crop
+  - width: 320
+    height: 240
+    method: scale
+  - width: 640
+    height: 480
+    method: scale
+  - width: 800
+    height: 600
+    method: scale
+</code></pre>
+<hr />
+<h3 id="media_retention"><a class="header" href="#media_retention"><code>media_retention</code></a></h3>
+<p>Controls whether local media and entries in the remote media cache
+(media that is downloaded from other homeservers) should be removed
+under certain conditions, typically for the purpose of saving space.</p>
+<p>Purging media files will be the carried out by the media worker
+(that is, the worker that has the <code>enable_media_repo</code> homeserver config
+option set to 'true'). This may be the main process.</p>
+<p>The <code>media_retention.local_media_lifetime</code> and
+<code>media_retention.remote_media_lifetime</code> config options control whether
+media will be purged if it has not been accessed in a given amount of
+time. Note that media is 'accessed' when loaded in a room in a client, or
+otherwise downloaded by a local or remote user. If the media has never
+been accessed, the media's creation time is used instead. Both thumbnails
+and the original media will be removed. If either of these options are unset,
+then media of that type will not be purged.</p>
+<p>Local or cached remote media that has been
+<a href="../../admin_api/media_admin_api.html#quarantining-media-in-a-room">quarantined</a>
+will not be deleted. Similarly, local media that has been marked as
+<a href="../../admin_api/media_admin_api.html#protecting-media-from-being-quarantined">protected from quarantine</a>
+will not be deleted.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">media_retention:
+    local_media_lifetime: 90d
+    remote_media_lifetime: 14d
+</code></pre>
+<hr />
+<h3 id="url_preview_enabled"><a class="header" href="#url_preview_enabled"><code>url_preview_enabled</code></a></h3>
+<p>This setting determines whether the preview URL API is enabled.
+It is disabled by default. Set to true to enable. If enabled you must specify a
+<code>url_preview_ip_range_blacklist</code> blacklist.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">url_preview_enabled: true
+</code></pre>
+<hr />
+<h3 id="url_preview_ip_range_blacklist"><a class="header" href="#url_preview_ip_range_blacklist"><code>url_preview_ip_range_blacklist</code></a></h3>
+<p>List of IP address CIDR ranges that the URL preview spider is denied
+from accessing.  There are no defaults: you must explicitly
+specify a list for URL previewing to work.  You should specify any
+internal services in your network that you do not want synapse to try
+to connect to, otherwise anyone in any Matrix room could cause your
+synapse to issue arbitrary GET requests to your internal services,
+causing serious security issues.</p>
+<p>(0.0.0.0 and :: are always blacklisted, whether or not they are explicitly
+listed here, since they correspond to unroutable addresses.)</p>
+<p>This must be specified if <code>url_preview_enabled</code> is set. It is recommended that
+you use the following example list as a starting point.</p>
+<p>Note: The value is ignored when an HTTP proxy is in use.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">url_preview_ip_range_blacklist:
+  - '127.0.0.0/8'
+  - '10.0.0.0/8'
+  - '172.16.0.0/12'
+  - '192.168.0.0/16'
+  - '100.64.0.0/10'
+  - '192.0.0.0/24'
+  - '169.254.0.0/16'
+  - '192.88.99.0/24'
+  - '198.18.0.0/15'
+  - '192.0.2.0/24'
+  - '198.51.100.0/24'
+  - '203.0.113.0/24'
+  - '224.0.0.0/4'
+  - '::1/128'
+  - 'fe80::/10'
+  - 'fc00::/7'
+  - '2001:db8::/32'
+  - 'ff00::/8'
+  - 'fec0::/10'
+</code></pre>
+<hr />
+<h3 id="url_preview_ip_range_whitelist"><a class="header" href="#url_preview_ip_range_whitelist"><code>url_preview_ip_range_whitelist</code></a></h3>
+<p>This option sets a list of IP address CIDR ranges that the URL preview spider is allowed
+to access even if they are specified in <code>url_preview_ip_range_blacklist</code>.
+This is useful for specifying exceptions to wide-ranging blacklisted
+target IP ranges - e.g. for enabling URL previews for a specific private
+website only visible in your network. Defaults to none. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">url_preview_ip_range_whitelist:
+   - '192.168.1.1'
+</code></pre>
+<hr />
+<h3 id="url_preview_url_blacklist"><a class="header" href="#url_preview_url_blacklist"><code>url_preview_url_blacklist</code></a></h3>
+<p>Optional list of URL matches that the URL preview spider is
+denied from accessing.  You should use <code>url_preview_ip_range_blacklist</code>
+in preference to this, otherwise someone could define a public DNS
+entry that points to a private IP address and circumvent the blacklist.
+This is more useful if you know there is an entire shape of URL that
+you know that will never want synapse to try to spider.</p>
+<p>Each list entry is a dictionary of url component attributes as returned
+by urlparse.urlsplit as applied to the absolute form of the URL.  See 
+<a href="https://docs.python.org/2/library/urlparse.html#urlparse.urlsplit">here</a> for more
+information. Some examples are:</p>
+<ul>
+<li><code>username</code></li>
+<li><code>netloc</code></li>
+<li><code>scheme</code></li>
+<li><code>path</code></li>
+</ul>
+<p>The values of the dictionary are treated as a filename match pattern
+applied to that component of URLs, unless they start with a ^ in which
+case they are treated as a regular expression match.  If all the
+specified component matches for a given list item succeed, the URL is
+blacklisted.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">url_preview_url_blacklist:
+  # blacklist any URL with a username in its URI
+  - username: '*'
+
+  # blacklist all *.google.com URLs
+  - netloc: 'google.com'
+  - netloc: '*.google.com'
+
+  # blacklist all plain HTTP URLs
+  - scheme: 'http'
+
+  # blacklist http(s)://www.acme.com/foo
+  - netloc: 'www.acme.com'
+    path: '/foo'
+
+  # blacklist any URL with a literal IPv4 address
+  - netloc: '^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$'
+</code></pre>
+<hr />
+<h3 id="max_spider_size"><a class="header" href="#max_spider_size"><code>max_spider_size</code></a></h3>
+<p>The largest allowed URL preview spidering size in bytes. Defaults to 10M.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">max_spider_size: 8M
+</code></pre>
+<hr />
+<h3 id="url_preview_language"><a class="header" href="#url_preview_language"><code>url_preview_language</code></a></h3>
+<p>A list of values for the Accept-Language HTTP header used when
+downloading webpages during URL preview generation. This allows
+Synapse to specify the preferred languages that URL previews should
+be in when communicating with remote servers.</p>
+<p>Each value is a IETF language tag; a 2-3 letter identifier for a
+language, optionally followed by subtags separated by '-', specifying
+a country or region variant.</p>
+<p>Multiple values can be provided, and a weight can be added to each by
+using quality value syntax (;q=). '*' translates to any language.</p>
+<p>Defaults to &quot;en&quot;.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml"> url_preview_accept_language:
+   - 'en-UK'
+   - 'en-US;q=0.9'
+   - 'fr;q=0.8'
+   - '*;q=0.7'
+</code></pre>
+<hr />
+<h3 id="oembed"><a class="header" href="#oembed"><code>oembed</code></a></h3>
+<p>oEmbed allows for easier embedding content from a website. It can be
+used for generating URLs previews of services which support it. A default list of oEmbed providers
+is included with Synapse. Set <code>disable_default_providers</code> to true to disable using
+these default oEmbed URLs. Use <code>additional_providers</code> to specify additional files with oEmbed configuration (each 
+should be in the form of providers.json). By default this list is empty. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">oembed:
+  disable_default_providers: true
+  additional_providers:
+    - oembed/my_providers.json
+</code></pre>
+<hr />
+<h2 id="captcha"><a class="header" href="#captcha">Captcha</a></h2>
+<p>See <a href="../../CAPTCHA_SETUP.html">here</a> for full details on setting up captcha.</p>
+<hr />
+<h3 id="recaptcha_public_key"><a class="header" href="#recaptcha_public_key"><code>recaptcha_public_key</code></a></h3>
+<p>This homeserver's ReCAPTCHA public key. Must be specified if <code>enable_registration_captcha</code> is 
+enabled.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">recaptcha_public_key: &quot;YOUR_PUBLIC_KEY&quot;
+</code></pre>
+<hr />
+<h3 id="recaptcha_private_key"><a class="header" href="#recaptcha_private_key"><code>recaptcha_private_key</code></a></h3>
+<p>This homeserver's ReCAPTCHA private key. Must be specified if <code>enable_registration_captcha</code> is 
+enabled.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">recaptcha_private_key: &quot;YOUR_PRIVATE_KEY&quot;
+</code></pre>
+<hr />
+<h3 id="enable_registration_captcha"><a class="header" href="#enable_registration_captcha"><code>enable_registration_captcha</code></a></h3>
+<p>Set to true to enable ReCaptcha checks when registering, preventing signup
+unless a captcha is answered. Requires a valid ReCaptcha public/private key. 
+Defaults to false.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">enable_registration_captcha: true
+</code></pre>
+<hr />
+<h3 id="recaptcha_siteverify_api"><a class="header" href="#recaptcha_siteverify_api"><code>recaptcha_siteverify_api</code></a></h3>
+<p>The API endpoint to use for verifying <code>m.login.recaptcha</code> responses.
+Defaults to <code>https://www.recaptcha.net/recaptcha/api/siteverify</code>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">recaptcha_siteverify_api: &quot;https://my.recaptcha.site&quot;
+</code></pre>
+<hr />
+<h2 id="turn"><a class="header" href="#turn">TURN</a></h2>
+<p>Options related to adding a TURN server to Synapse.</p>
+<hr />
+<h3 id="turn_uris"><a class="header" href="#turn_uris"><code>turn_uris</code></a></h3>
+<p>The public URIs of the TURN server to give to clients.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">turn_uris: [turn:example.org]
+</code></pre>
+<hr />
+<h3 id="turn_shared_secret"><a class="header" href="#turn_shared_secret"><code>turn_shared_secret</code></a></h3>
+<p>The shared secret used to compute passwords for the TURN server.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">turn_shared_secret: &quot;YOUR_SHARED_SECRET&quot;
+</code></pre>
+<hr />
+<p>Config options: <code>turn_username</code> and <code>turn_password</code></p>
+<p>The Username and password if the TURN server needs them and does not use a token.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">turn_username: &quot;TURNSERVER_USERNAME&quot;
+turn_password: &quot;TURNSERVER_PASSWORD&quot;
+</code></pre>
+<hr />
+<h3 id="turn_user_lifetime"><a class="header" href="#turn_user_lifetime"><code>turn_user_lifetime</code></a></h3>
+<p>How long generated TURN credentials last. Defaults to 1h.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">turn_user_lifetime: 2h
+</code></pre>
+<hr />
+<h3 id="turn_allow_guests"><a class="header" href="#turn_allow_guests"><code>turn_allow_guests</code></a></h3>
+<p>Whether guests should be allowed to use the TURN server. This defaults to true, otherwise
+VoIP will be unreliable for guests. However, it does introduce a slight security risk as
+it allows users to connect to arbitrary endpoints without having first signed up for a valid account (e.g. by passing a CAPTCHA).</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">turn_allow_guests: false
+</code></pre>
+<hr />
+<h2 id="registration"><a class="header" href="#registration">Registration</a></h2>
+<p>Registration can be rate-limited using the parameters in the <a href="#ratelimiting">Ratelimiting</a> section of this manual.</p>
+<hr />
+<h3 id="enable_registration"><a class="header" href="#enable_registration"><code>enable_registration</code></a></h3>
+<p>Enable registration for new users. Defaults to false. It is highly recommended that if you enable registration,
+you use either captcha, email, or token-based verification to verify that new users are not bots. In order to enable registration 
+without any verification, you must also set <code>enable_registration_without_verification</code> to true.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">enable_registration: true
+</code></pre>
+<hr />
+<h3 id="enable_registration_without_verification"><a class="header" href="#enable_registration_without_verification"><code>enable_registration_without_verification</code></a></h3>
+<p>Enable registration without email or captcha verification. Note: this option is <em>not</em> recommended,
+as registration without verification is a known vector for spam and abuse. Defaults to false. Has no effect
+unless <code>enable_registration</code> is also enabled.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">enable_registration_without_verification: true
+</code></pre>
+<hr />
+<h3 id="session_lifetime"><a class="header" href="#session_lifetime"><code>session_lifetime</code></a></h3>
+<p>Time that a user's session remains valid for, after they log in.</p>
+<p>Note that this is not currently compatible with guest logins.</p>
+<p>Note also that this is calculated at login time: changes are not applied retrospectively to users who have already 
+logged in.</p>
+<p>By default, this is infinite.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">session_lifetime: 24h
+</code></pre>
+<hr />
+<h3 id="refresh_access_token_lifetime"><a class="header" href="#refresh_access_token_lifetime"><code>refresh_access_token_lifetime</code></a></h3>
+<p>Time that an access token remains valid for, if the session is using refresh tokens.</p>
+<p>For more information about refresh tokens, please see the <a href="user_authentication/refresh_tokens.html">manual</a>.</p>
+<p>Note that this only applies to clients which advertise support for refresh tokens.</p>
+<p>Note also that this is calculated at login time and refresh time: changes are not applied to 
+existing sessions until they are refreshed.</p>
+<p>By default, this is 5 minutes.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">refreshable_access_token_lifetime: 10m
+</code></pre>
+<hr />
+<h3 id="refresh_token_lifetime-24h"><a class="header" href="#refresh_token_lifetime-24h"><code>refresh_token_lifetime: 24h</code></a></h3>
+<p>Time that a refresh token remains valid for (provided that it is not
+exchanged for another one first).
+This option can be used to automatically log-out inactive sessions.
+Please see the manual for more information.</p>
+<p>Note also that this is calculated at login time and refresh time:
+changes are not applied to existing sessions until they are refreshed.</p>
+<p>By default, this is infinite.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">refresh_token_lifetime: 24h
+</code></pre>
+<hr />
+<h3 id="nonrefreshable_access_token_lifetime"><a class="header" href="#nonrefreshable_access_token_lifetime"><code>nonrefreshable_access_token_lifetime</code></a></h3>
+<p>Time that an access token remains valid for, if the session is NOT
+using refresh tokens.</p>
+<p>Please note that not all clients support refresh tokens, so setting
+this to a short value may be inconvenient for some users who will
+then be logged out frequently.</p>
+<p>Note also that this is calculated at login time: changes are not applied
+retrospectively to existing sessions for users that have already logged in.</p>
+<p>By default, this is infinite.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">nonrefreshable_access_token_lifetime: 24h
+</code></pre>
+<hr />
+<h3 id="registrations_require_3pid"><a class="header" href="#registrations_require_3pid"><code>registrations_require_3pid</code></a></h3>
+<p>If this is set, the user must provide all of the specified types of 3PID when registering.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">registrations_require_3pid:
+  - email
+  - msisdn
+</code></pre>
+<hr />
+<h3 id="disable_msisdn_registration"><a class="header" href="#disable_msisdn_registration"><code>disable_msisdn_registration</code></a></h3>
+<p>Explicitly disable asking for MSISDNs from the registration
+flow (overrides <code>registrations_require_3pid</code> if MSISDNs are set as required).</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">disable_msisdn_registration: true
+</code></pre>
+<hr />
+<h3 id="allowed_local_3pids"><a class="header" href="#allowed_local_3pids"><code>allowed_local_3pids</code></a></h3>
+<p>Mandate that users are only allowed to associate certain formats of
+3PIDs with accounts on this server, as specified by the <code>medium</code> and <code>pattern</code> sub-options.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">allowed_local_3pids:
+  - medium: email
+    pattern: '^[^@]+@matrix\.org$'
+  - medium: email
+    pattern: '^[^@]+@vector\.im$'
+  - medium: msisdn
+    pattern: '\+44'
+</code></pre>
+<hr />
+<h3 id="enable_3pid_lookup"><a class="header" href="#enable_3pid_lookup"><code>enable_3pid_lookup</code></a></h3>
+<p>Enable 3PIDs lookup requests to identity servers from this server. Defaults to true.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">enable_3pid_lookup: false
+</code></pre>
+<hr />
+<h3 id="registration_requires_token"><a class="header" href="#registration_requires_token"><code>registration_requires_token</code></a></h3>
+<p>Require users to submit a token during registration.
+Tokens can be managed using the admin <a href="../administration/admin_api/registration_tokens.html">API</a>.
+Note that <code>enable_registration</code> must be set to true.
+Disabling this option will not delete any tokens previously generated.
+Defaults to false. Set to true to enable.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">registration_requires_token: true
+</code></pre>
+<hr />
+<h3 id="registration_shared_secret"><a class="header" href="#registration_shared_secret"><code>registration_shared_secret</code></a></h3>
+<p>If set, allows registration of standard or admin accounts by anyone who
+has the shared secret, even if registration is otherwise disabled.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">registration_shared_secret: &lt;PRIVATE STRING&gt;
+</code></pre>
+<hr />
+<h3 id="bcrypt_rounds"><a class="header" href="#bcrypt_rounds"><code>bcrypt_rounds</code></a></h3>
+<p>Set the number of bcrypt rounds used to generate password hash.
+Larger numbers increase the work factor needed to generate the hash.
+The default number is 12 (which equates to 2^12 rounds).
+N.B. that increasing this will exponentially increase the time required
+to register or login - e.g. 24 =&gt; 2^24 rounds which will take &gt;20 mins.
+Example configuration:</p>
+<pre><code class="language-yaml">bcrypt_rounds: 14
+</code></pre>
+<hr />
+<h3 id="allow_guest_access"><a class="header" href="#allow_guest_access"><code>allow_guest_access</code></a></h3>
+<p>Allows users to register as guests without a password/email/etc, and
+participate in rooms hosted on this server which have been made
+accessible to anonymous users. Defaults to false.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">allow_guest_access: true
+</code></pre>
+<hr />
+<h3 id="default_identity_server"><a class="header" href="#default_identity_server"><code>default_identity_server</code></a></h3>
+<p>The identity server which we suggest that clients should use when users log
+in on this server.</p>
+<p>(By default, no suggestion is made, so it is left up to the client.
+This setting is ignored unless <code>public_baseurl</code> is also explicitly set.)</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">default_identity_server: https://matrix.org
+</code></pre>
+<hr />
+<h3 id="account_threepid_delegates"><a class="header" href="#account_threepid_delegates"><code>account_threepid_delegates</code></a></h3>
+<p>Handle threepid (email/phone etc) registration and password resets through a set of
+<em>trusted</em> identity servers. Note that this allows the configured identity server to
+reset passwords for accounts!</p>
+<p>Be aware that if <code>email</code> is not set, and SMTP options have not been
+configured in the email config block, registration and user password resets via
+email will be globally disabled.</p>
+<p>Additionally, if <code>msisdn</code> is not set, registration and password resets via msisdn
+will be disabled regardless, and users will not be able to associate an msisdn
+identifier to their account. This is due to Synapse currently not supporting
+any method of sending SMS messages on its own.</p>
+<p>To enable using an identity server for operations regarding a particular third-party
+identifier type, set the value to the URL of that identity server as shown in the
+examples below.</p>
+<p>Servers handling the these requests must answer the <code>/requestToken</code> endpoints defined
+by the Matrix Identity Service API <a href="https://matrix.org/docs/spec/identity_service/latest">specification</a>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">account_threepid_delegates:
+    email: https://example.com     # Delegate email sending to example.com
+    msisdn: http://localhost:8090  # Delegate SMS sending to this local process
+</code></pre>
+<hr />
+<h3 id="enable_set_displayname"><a class="header" href="#enable_set_displayname"><code>enable_set_displayname</code></a></h3>
+<p>Whether users are allowed to change their displayname after it has
+been initially set. Useful when provisioning users based on the
+contents of a third-party directory.</p>
+<p>Does not apply to server administrators. Defaults to true.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">enable_set_displayname: false
+</code></pre>
+<hr />
+<h3 id="enable_set_avatar_url"><a class="header" href="#enable_set_avatar_url"><code>enable_set_avatar_url</code></a></h3>
+<p>Whether users are allowed to change their avatar after it has been
+initially set. Useful when provisioning users based on the contents
+of a third-party directory.</p>
+<p>Does not apply to server administrators. Defaults to true.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">enable_set_avatar_url: false
+</code></pre>
+<hr />
+<h3 id="enable_3pid_changes"><a class="header" href="#enable_3pid_changes"><code>enable_3pid_changes</code></a></h3>
+<p>Whether users can change the third-party IDs associated with their accounts
+(email address and msisdn).</p>
+<p>Defaults to true.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">enable_3pid_changes: false
+</code></pre>
+<hr />
+<h3 id="auto_join_rooms"><a class="header" href="#auto_join_rooms"><code>auto_join_rooms</code></a></h3>
+<p>Users who register on this homeserver will automatically be joined
+to the rooms listed under this option.</p>
+<p>By default, any room aliases included in this list will be created
+as a publicly joinable room when the first user registers for the
+homeserver. If the room already exists, make certain it is a publicly joinable
+room, i.e. the join rule of the room must be set to 'public'. You can find more options
+relating to auto-joining rooms below. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">auto_join_rooms:
+  - &quot;#exampleroom:example.com&quot;
+  - &quot;#anotherexampleroom:example.com&quot;
+</code></pre>
+<hr />
+<h3 id="autocreate_auto_join_rooms"><a class="header" href="#autocreate_auto_join_rooms"><code>autocreate_auto_join_rooms</code></a></h3>
+<p>Where <code>auto_join_rooms</code> are specified, setting this flag ensures that
+the rooms exist by creating them when the first user on the
+homeserver registers.</p>
+<p>By default the auto-created rooms are publicly joinable from any federated
+server. Use the <code>autocreate_auto_join_rooms_federated</code> and
+<code>autocreate_auto_join_room_preset</code> settings to customise this behaviour.</p>
+<p>Setting to false means that if the rooms are not manually created,
+users cannot be auto-joined since they do not exist.</p>
+<p>Defaults to true.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">autocreate_auto_join_rooms: false
+</code></pre>
+<hr />
+<h3 id="autocreate_auto_join_rooms_federated"><a class="header" href="#autocreate_auto_join_rooms_federated"><code>autocreate_auto_join_rooms_federated</code></a></h3>
+<p>Whether the rooms listen in <code>auto_join_rooms</code> that are auto-created are available
+via federation. Only has an effect if <code>autocreate_auto_join_rooms</code> is true.</p>
+<p>Note that whether a room is federated cannot be modified after
+creation.</p>
+<p>Defaults to true: the room will be joinable from other servers.
+Set to false to prevent users from other homeservers from
+joining these rooms.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">autocreate_auto_join_rooms_federated: false
+</code></pre>
+<hr />
+<h3 id="autocreate_auto_join_room_preset"><a class="header" href="#autocreate_auto_join_room_preset"><code>autocreate_auto_join_room_preset</code></a></h3>
+<p>The room preset to use when auto-creating one of <code>auto_join_rooms</code>. Only has an
+effect if <code>autocreate_auto_join_rooms</code> is true.</p>
+<p>Possible values for this option are:</p>
+<ul>
+<li>&quot;public_chat&quot;: the room is joinable by anyone, including
+federated servers if <code>autocreate_auto_join_rooms_federated</code> is true (the default).</li>
+<li>&quot;private_chat&quot;: an invitation is required to join these rooms. </li>
+<li>&quot;trusted_private_chat&quot;: an invitation is required to join this room and the invitee is
+assigned a power level of 100 upon joining the room. </li>
+</ul>
+<p>If a value of &quot;private_chat&quot; or &quot;trusted_private_chat&quot; is used then
+<code>auto_join_mxid_localpart</code> must also be configured.</p>
+<p>Defaults to &quot;public_chat&quot;.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">autocreate_auto_join_room_preset: private_chat
+</code></pre>
+<hr />
+<h3 id="auto_join_mxid_localpart"><a class="header" href="#auto_join_mxid_localpart"><code>auto_join_mxid_localpart</code></a></h3>
+<p>The local part of the user id which is used to create <code>auto_join_rooms</code> if
+<code>autocreate_auto_join_rooms</code> is true. If this is not provided then the
+initial user account that registers will be used to create the rooms.</p>
+<p>The user id is also used to invite new users to any auto-join rooms which
+are set to invite-only.</p>
+<p>It <em>must</em> be configured if <code>autocreate_auto_join_room_preset</code> is set to
+&quot;private_chat&quot; or &quot;trusted_private_chat&quot;.</p>
+<p>Note that this must be specified in order for new users to be correctly
+invited to any auto-join rooms which have been set to invite-only (either
+at the time of creation or subsequently).</p>
+<p>Note that, if the room already exists, this user must be joined and
+have the appropriate permissions to invite new members.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">auto_join_mxid_localpart: system
+</code></pre>
+<hr />
+<h3 id="auto_join_rooms_for_guests"><a class="header" href="#auto_join_rooms_for_guests"><code>auto_join_rooms_for_guests</code></a></h3>
+<p>When <code>auto_join_rooms</code> is specified, setting this flag to false prevents
+guest accounts from being automatically joined to the rooms.</p>
+<p>Defaults to true.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">auto_join_rooms_for_guests: false
+</code></pre>
+<hr />
+<h3 id="inhibit_user_in_use_error"><a class="header" href="#inhibit_user_in_use_error"><code>inhibit_user_in_use_error</code></a></h3>
+<p>Whether to inhibit errors raised when registering a new account if the user ID
+already exists. If turned on, requests to <code>/register/available</code> will always
+show a user ID as available, and Synapse won't raise an error when starting
+a registration with a user ID that already exists. However, Synapse will still
+raise an error if the registration completes and the username conflicts.</p>
+<p>Defaults to false.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">inhibit_user_in_use_error: true
+</code></pre>
+<hr />
+<h2 id="metrics"><a class="header" href="#metrics">Metrics</a></h2>
+<p>Config options related to metrics.</p>
+<hr />
+<h3 id="enable_metrics"><a class="header" href="#enable_metrics"><code>enable_metrics</code></a></h3>
+<p>Set to true to enable collection and rendering of performance metrics. 
+Defaults to false.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">enable_metrics: true
+</code></pre>
+<hr />
+<h3 id="sentry"><a class="header" href="#sentry"><code>sentry</code></a></h3>
+<p>Use this option to enable sentry integration. Provide the DSN assigned to you by sentry
+with the <code>dsn</code> setting. </p>
+<p>NOTE: While attempts are made to ensure that the logs don't contain
+any sensitive information, this cannot be guaranteed. By enabling
+this option the sentry server may therefore receive sensitive 
+information, and it in turn may then disseminate sensitive information
+through insecure notification channels if so configured.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">sentry:
+    dsn: &quot;...&quot;
+</code></pre>
+<hr />
+<h3 id="metrics_flags"><a class="header" href="#metrics_flags"><code>metrics_flags</code></a></h3>
+<p>Flags to enable Prometheus metrics which are not suitable to be
+enabled by default, either for performance reasons or limited use.
+Currently the only option is <code>known_servers</code>, which publishes 
+<code>synapse_federation_known_servers</code>, a gauge of the number of
+servers this homeserver knows about, including itself. May cause
+performance problems on large homeservers.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">metrics_flags:
+    known_servers: true
+</code></pre>
+<hr />
+<h3 id="report_stats"><a class="header" href="#report_stats"><code>report_stats</code></a></h3>
+<p>Whether or not to report anonymized homeserver usage statistics. This is originally
+set when generating the config. Set this option to true or false to change the current
+behavior. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">report_stats: true
+</code></pre>
+<hr />
+<h3 id="report_stats_endpoint"><a class="header" href="#report_stats_endpoint"><code>report_stats_endpoint</code></a></h3>
+<p>The endpoint to report the anonymized homeserver usage statistics to.
+Defaults to https://matrix.org/report-usage-stats/push</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">report_stats_endpoint: https://example.com/report-usage-stats/push
+</code></pre>
+<hr />
+<h2 id="api-configuration"><a class="header" href="#api-configuration">API Configuration</a></h2>
+<p>Config settings related to the client/server API</p>
+<hr />
+<h3 id="room_prejoin_state"><a class="header" href="#room_prejoin_state"><code>room_prejoin_state:</code></a></h3>
+<p>Controls for the state that is shared with users who receive an invite
+to a room. By default, the following state event types are shared with users who 
+receive invites to the room:</p>
+<ul>
+<li>m.room.join_rules</li>
+<li>m.room.canonical_alias</li>
+<li>m.room.avatar</li>
+<li>m.room.encryption</li>
+<li>m.room.name</li>
+<li>m.room.create</li>
+<li>m.room.topic</li>
+</ul>
+<p>To change the default behavior, use the following sub-options:</p>
+<ul>
+<li><code>disable_default_event_types</code>: set to true to disable the above defaults. If this 
+is enabled, only the event types listed in <code>additional_event_types</code> are shared.
+Defaults to false.</li>
+<li><code>additional_event_types</code>: Additional state event types to share with users when they are invited
+to a room. By default, this list is empty (so only the default event types are shared).</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">room_prejoin_state:
+   disable_default_event_types: true
+   additional_event_types:
+     - org.example.custom.event.type
+     - m.room.join_rules
+</code></pre>
+<hr />
+<h3 id="track_puppeted_user_ips"><a class="header" href="#track_puppeted_user_ips"><code>track_puppeted_user_ips</code></a></h3>
+<p>We record the IP address of clients used to access the API for various
+reasons, including displaying it to the user in the &quot;Where you're signed in&quot;
+dialog.</p>
+<p>By default, when puppeting another user via the admin API, the client IP
+address is recorded against the user who created the access token (ie, the
+admin user), and <em>not</em> the puppeted user.</p>
+<p>Set this option to true to also record the IP address against the puppeted
+user. (This also means that the puppeted user will count as an &quot;active&quot; user
+for the purpose of monthly active user tracking - see <code>limit_usage_by_mau</code> etc
+above.)</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">track_puppeted_user_ips: true
+</code></pre>
+<hr />
+<h3 id="app_service_config_files"><a class="header" href="#app_service_config_files"><code>app_service_config_files</code></a></h3>
+<p>A list of application service config files to use.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">app_service_config_files:
+  - app_service_1.yaml
+  - app_service_2.yaml
+</code></pre>
+<hr />
+<h3 id="track_appservice_user_ips"><a class="header" href="#track_appservice_user_ips"><code>track_appservice_user_ips</code></a></h3>
+<p>Defaults to false. Set to true to enable tracking of application service IP addresses.
+Implicitly enables MAU tracking for application service users.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">track_appservice_user_ips: true
+</code></pre>
+<hr />
+<h3 id="macaroon_secret_key"><a class="header" href="#macaroon_secret_key"><code>macaroon_secret_key</code></a></h3>
+<p>A secret which is used to sign access tokens. If none is specified,
+the <code>registration_shared_secret</code> is used, if one is given; otherwise,
+a secret key is derived from the signing key.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">macaroon_secret_key: &lt;PRIVATE STRING&gt;
+</code></pre>
+<hr />
+<h3 id="form_secret"><a class="header" href="#form_secret"><code>form_secret</code></a></h3>
+<p>A secret which is used to calculate HMACs for form values, to stop
+falsification of values. Must be specified for the User Consent
+forms to work.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">form_secret: &lt;PRIVATE STRING&gt;
+</code></pre>
+<hr />
+<h2 id="signing-keys"><a class="header" href="#signing-keys">Signing Keys</a></h2>
+<p>Config options relating to signing keys</p>
+<hr />
+<h3 id="signing_key_path"><a class="header" href="#signing_key_path"><code>signing_key_path</code></a></h3>
+<p>Path to the signing key to sign messages with.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">signing_key_path: &quot;CONFDIR/SERVERNAME.signing.key&quot;
+</code></pre>
+<hr />
+<h3 id="old_signing_keys"><a class="header" href="#old_signing_keys"><code>old_signing_keys</code></a></h3>
+<p>The keys that the server used to sign messages with but won't use
+to sign new messages. For each key, <code>key</code> should be the base64-encoded public key, and
+<code>expired_ts</code>should be the time (in milliseconds since the unix epoch) that
+it was last used.</p>
+<p>It is possible to build an entry from an old <code>signing.key</code> file using the
+<code>export_signing_key</code> script which is provided with synapse.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">old_signing_keys:
+  &quot;ed25519:id&quot;: { key: &quot;base64string&quot;, expired_ts: 123456789123 }
+</code></pre>
+<hr />
+<h3 id="key_refresh_interval"><a class="header" href="#key_refresh_interval"><code>key_refresh_interval</code></a></h3>
+<p>How long key response published by this server is valid for.
+Used to set the <code>valid_until_ts</code> in <code>/key/v2</code> APIs.
+Determines how quickly servers will query to check which keys
+are still valid. Defaults to 1d.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">key_refresh_interval: 2d
+</code></pre>
+<hr />
+<h3 id="trusted_key_servers"><a class="header" href="#trusted_key_servers"><code>trusted_key_servers:</code></a></h3>
+<p>The trusted servers to download signing keys from.</p>
+<p>When we need to fetch a signing key, each server is tried in parallel.</p>
+<p>Normally, the connection to the key server is validated via TLS certificates.
+Additional security can be provided by configuring a <code>verify key</code>, which
+will make synapse check that the response is signed by that key.</p>
+<p>This setting supercedes an older setting named <code>perspectives</code>. The old format
+is still supported for backwards-compatibility, but it is deprecated.</p>
+<p><code>trusted_key_servers</code> defaults to matrix.org, but using it will generate a
+warning on start-up. To suppress this warning, set
+<code>suppress_key_server_warning</code> to true.</p>
+<p>Options for each entry in the list include:</p>
+<ul>
+<li><code>server_name</code>: the name of the server. Required.</li>
+<li><code>verify_keys</code>: an optional map from key id to base64-encoded public key.
+If specified, we will check that the response is signed by at least
+one of the given keys.</li>
+<li><code>accept_keys_insecurely</code>: a boolean. Normally, if <code>verify_keys</code> is unset,
+and <code>federation_verify_certificates</code> is not <code>true</code>, synapse will refuse 
+to start, because this would allow anyone who can spoof DNS responses
+to masquerade as the trusted key server. If you know what you are doing
+and are sure that your network environment provides a secure connection
+to the key server, you can set this to <code>true</code> to override this behaviour.</li>
+</ul>
+<p>Example configuration #1:</p>
+<pre><code class="language-yaml">trusted_key_servers:
+  - server_name: &quot;my_trusted_server.example.com&quot;
+    verify_keys:
+      &quot;ed25519:auto&quot;: &quot;abcdefghijklmnopqrstuvwxyzabcdefghijklmopqr&quot;
+  - server_name: &quot;my_other_trusted_server.example.com&quot;
+</code></pre>
+<p>Example configuration #2:</p>
+<pre><code class="language-yaml">trusted_key_servers:
+  - server_name: &quot;matrix.org&quot;
+</code></pre>
+<hr />
+<h3 id="suppress_key_server_warning"><a class="header" href="#suppress_key_server_warning"><code>suppress_key_server_warning</code></a></h3>
+<p>Set the following to true to disable the warning that is emitted when the
+<code>trusted_key_servers</code> include 'matrix.org'. See above.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">suppress_key_server_warning: true
+</code></pre>
+<hr />
+<h3 id="key_server_signing_keys_path"><a class="header" href="#key_server_signing_keys_path"><code>key_server_signing_keys_path</code></a></h3>
+<p>The signing keys to use when acting as a trusted key server. If not specified
+defaults to the server signing key.</p>
+<p>Can contain multiple keys, one per line.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">key_server_signing_keys_path: &quot;key_server_signing_keys.key&quot;
+</code></pre>
+<hr />
+<h2 id="single-sign-on-integration"><a class="header" href="#single-sign-on-integration">Single sign-on integration</a></h2>
+<p>The following settings can be used to make Synapse use a single sign-on
+provider for authentication, instead of its internal password database.</p>
+<p>You will probably also want to set the following options to false to
+disable the regular login/registration flows:</p>
+<ul>
+<li><code>enable_registration</code></li>
+<li><code>password_config.enabled</code></li>
+</ul>
+<p>You will also want to investigate the settings under the &quot;sso&quot; configuration
+section below.</p>
+<hr />
+<h3 id="saml2_config"><a class="header" href="#saml2_config"><code>saml2_config</code></a></h3>
+<p>Enable SAML2 for registration and login. Uses pysaml2. To learn more about pysaml and
+to find a full list options for configuring pysaml, read the docs <a href="https://pysaml2.readthedocs.io/en/latest/">here</a>.</p>
+<p>At least one of <code>sp_config</code> or <code>config_path</code> must be set in this section to
+enable SAML login. You can either put your entire pysaml config inline using the <code>sp_config</code>
+option, or you can specify a path to a psyaml config file with the sub-option <code>config_path</code>.
+This setting has the following sub-options:</p>
+<ul>
+<li><code>sp_config</code>: the configuration for the pysaml2 Service Provider. See pysaml2 docs for format of config.
+Default values will be used for the <code>entityid</code> and <code>service</code> settings,
+so it is not normally necessary to specify them unless you need to
+override them. Here are a few useful sub-options for configuring pysaml:
+<ul>
+<li><code>metadata</code>: Point this to the IdP's metadata. You must provide either a local
+file via the <code>local</code> attribute or (preferably) a URL via the
+<code>remote</code> attribute.</li>
+<li><code>accepted_time_diff: 3</code>: Allowed clock difference in seconds between the homeserver and IdP.
+Defaults to 0.</li>
+<li><code>service</code>: By default, the user has to go to our login page first. If you'd like
+to allow IdP-initiated login, set <code>allow_unsolicited</code> to true under <code>sp</code> in the <code>service</code>
+section.</li>
+</ul>
+</li>
+<li><code>config_path</code>: specify a separate pysaml2 configuration file thusly: 
+<code>config_path: &quot;CONFDIR/sp_conf.py&quot;</code></li>
+<li><code>saml_session_lifetime</code>: The lifetime of a SAML session. This defines how long a user has to
+complete the authentication process, if <code>allow_unsolicited</code> is unset. The default is 15 minutes.</li>
+<li><code>user_mapping_provider</code>: Using this option, an external module can be provided as a 
+custom solution to mapping attributes returned from a saml provider onto a matrix user. The 
+<code>user_mapping_provider</code> has the following attributes:
+<ul>
+<li><code>module</code>: The custom module's class. </li>
+<li><code>config</code>: Custom configuration values for the module. Use the values provided in the 
+example if you are using the built-in user_mapping_provider, or provide your own
+config values for a custom class if you are using one. This section will be passed as a Python
+dictionary to the module's <code>parse_config</code> method. The built-in provider takes the following two
+options:
+<ul>
+<li><code>mxid_source_attribute</code>: The SAML attribute (after mapping via the attribute maps) to use
+to derive the Matrix ID from. It is 'uid' by default. Note: This used to be configured by the
+<code>saml2_config.mxid_source_attribute option</code>. If that is still defined, its value will be used instead.</li>
+<li><code>mxid_mapping</code>: The mapping system to use for mapping the saml attribute onto a
+matrix ID. Options include: <code>hexencode</code> (which maps unpermitted characters to '=xx')
+and <code>dotreplace</code> (which replaces unpermitted characters with '.').
+The default is <code>hexencode</code>. Note: This used to be configured by the
+<code>saml2_config.mxid_mapping option</code>. If that is still defined, its value will be used instead.</li>
+</ul>
+</li>
+</ul>
+</li>
+<li><code>grandfathered_mxid_source_attribute</code>: In previous versions of synapse, the mapping from SAML attribute to
+MXID was always calculated dynamically rather than stored in a table. For backwards- compatibility, we will look for <code>user_ids</code>
+matching such a pattern before creating a new account. This setting controls the SAML attribute which will be used for this
+backwards-compatibility lookup. Typically it should be 'uid', but if the attribute maps are changed, it may be necessary to change it.
+The default is 'uid'. </li>
+<li><code>attribute_requirements</code>: It is possible to configure Synapse to only allow logins if SAML attributes
+match particular values. The requirements can be listed under
+<code>attribute_requirements</code> as shown in the example. All of the listed attributes must
+match for the login to be permitted.</li>
+<li><code>idp_entityid</code>: If the metadata XML contains multiple IdP entities then the <code>idp_entityid</code>
+option must be set to the entity to redirect users to.
+Most deployments only have a single IdP entity and so should omit this option.</li>
+</ul>
+<p>Once SAML support is enabled, a metadata file will be exposed at
+<code>https://&lt;server&gt;:&lt;port&gt;/_synapse/client/saml2/metadata.xml</code>, which you may be able to
+use to configure your SAML IdP with. Alternatively, you can manually configure
+the IdP to use an ACS location of
+<code>https://&lt;server&gt;:&lt;port&gt;/_synapse/client/saml2/authn_response</code>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">saml2_config:
+  sp_config:
+    metadata:
+      local: [&quot;saml2/idp.xml&quot;]
+      remote:
+        - url: https://our_idp/metadata.xml
+    accepted_time_diff: 3
+
+    service:
+      sp:
+        allow_unsolicited: true
+
+    # The examples below are just used to generate our metadata xml, and you
+    # may well not need them, depending on your setup. Alternatively you
+    # may need a whole lot more detail - see the pysaml2 docs!
+    description: [&quot;My awesome SP&quot;, &quot;en&quot;]
+    name: [&quot;Test SP&quot;, &quot;en&quot;]
+
+    ui_info:
+      display_name:
+        - lang: en
+          text: &quot;Display Name is the descriptive name of your service.&quot;
+      description:
+        - lang: en
+          text: &quot;Description should be a short paragraph explaining the purpose of the service.&quot;
+      information_url:
+        - lang: en
+          text: &quot;https://example.com/terms-of-service&quot;
+      privacy_statement_url:
+        - lang: en
+          text: &quot;https://example.com/privacy-policy&quot;
+      keywords:
+        - lang: en
+          text: [&quot;Matrix&quot;, &quot;Element&quot;]
+      logo:
+        - lang: en
+          text: &quot;https://example.com/logo.svg&quot;
+          width: &quot;200&quot;
+          height: &quot;80&quot;
+
+    organization:
+      name: Example com
+      display_name:
+        - [&quot;Example co&quot;, &quot;en&quot;]
+      url: &quot;http://example.com&quot;
+
+    contact_person:
+      - given_name: Bob
+        sur_name: &quot;the Sysadmin&quot;
+        email_address&quot;: [&quot;admin@example.com&quot;]
+        contact_type&quot;: technical
+        
+  saml_session_lifetime: 5m
+  
+  user_mapping_provider:
+    # Below options are intended for the built-in provider, they should be 
+    # changed if using a custom module. 
+    config:
+      mxid_source_attribute: displayName
+      mxid_mapping: dotreplace
+  
+  grandfathered_mxid_source_attribute: upn
+
+  attribute_requirements:
+    - attribute: userGroup
+      value: &quot;staff&quot;
+    - attribute: department
+      value: &quot;sales&quot;
+
+  idp_entityid: 'https://our_idp/entityid'
+</code></pre>
+<hr />
+<h3 id="oidc_providers"><a class="header" href="#oidc_providers"><code>oidc_providers</code></a></h3>
+<p>List of OpenID Connect (OIDC) / OAuth 2.0 identity providers, for registration
+and login. See <a href="../../openid.html">here</a>
+for information on how to configure these options.</p>
+<p>For backwards compatibility, it is also possible to configure a single OIDC
+provider via an <code>oidc_config</code> setting. This is now deprecated and admins are
+advised to migrate to the <code>oidc_providers</code> format. (When doing that migration,
+use <code>oidc</code> for the <code>idp_id</code> to ensure that existing users continue to be
+recognised.)</p>
+<p>Options for each entry include:</p>
+<ul>
+<li>
+<p><code>idp_id</code>: a unique identifier for this identity provider. Used internally
+by Synapse; should be a single word such as 'github'.
+Note that, if this is changed, users authenticating via that provider
+will no longer be recognised as the same user!
+(Use &quot;oidc&quot; here if you are migrating from an old <code>oidc_config</code> configuration.)</p>
+</li>
+<li>
+<p><code>idp_name</code>: A user-facing name for this identity provider, which is used to
+offer the user a choice of login mechanisms.</p>
+</li>
+<li>
+<p><code>idp_icon</code>: An optional icon for this identity provider, which is presented
+by clients and Synapse's own IdP picker page. If given, must be an
+MXC URI of the format mxc://<server-name>/<media-id>. (An easy way to
+obtain such an MXC URI is to upload an image to an (unencrypted) room
+and then copy the &quot;url&quot; from the source of the event.)</p>
+</li>
+<li>
+<p><code>idp_brand</code>: An optional brand for this identity provider, allowing clients
+to style the login flow according to the identity provider in question.
+See the <a href="https://spec.matrix.org/latest/">spec</a> for possible options here.</p>
+</li>
+<li>
+<p><code>discover</code>: set to false to disable the use of the OIDC discovery mechanism
+to discover endpoints. Defaults to true.</p>
+</li>
+<li>
+<p><code>issuer</code>: Required. The OIDC issuer. Used to validate tokens and (if discovery
+is enabled) to discover the provider's endpoints.</p>
+</li>
+<li>
+<p><code>client_id</code>: Required. oauth2 client id to use.</p>
+</li>
+<li>
+<p><code>client_secret</code>: oauth2 client secret to use. May be omitted if
+<code>client_secret_jwt_key</code> is given, or if <code>client_auth_method</code> is 'none'.</p>
+</li>
+<li>
+<p><code>client_secret_jwt_key</code>: Alternative to client_secret: details of a key used
+to create a JSON Web Token to be used as an OAuth2 client secret. If
+given, must be a dictionary with the following properties:</p>
+<ul>
+<li>
+<p><code>key</code>: a pem-encoded signing key. Must be a suitable key for the
+algorithm specified. Required unless <code>key_file</code> is given.</p>
+</li>
+<li>
+<p><code>key_file</code>: the path to file containing a pem-encoded signing key file.
+Required unless <code>key</code> is given.</p>
+</li>
+<li>
+<p><code>jwt_header</code>: a dictionary giving properties to include in the JWT
+header. Must include the key <code>alg</code>, giving the algorithm used to
+sign the JWT, such as &quot;ES256&quot;, using the JWA identifiers in
+RFC7518.</p>
+</li>
+<li>
+<p><code>jwt_payload</code>: an optional dictionary giving properties to include in
+the JWT payload. Normally this should include an <code>iss</code> key.</p>
+</li>
+</ul>
+</li>
+<li>
+<p><code>client_auth_method</code>: auth method to use when exchanging the token. Valid
+values are <code>client_secret_basic</code> (default), <code>client_secret_post</code> and
+<code>none</code>.</p>
+</li>
+<li>
+<p><code>scopes</code>: list of scopes to request. This should normally include the &quot;openid&quot;
+scope. Defaults to [&quot;openid&quot;].</p>
+</li>
+<li>
+<p><code>authorization_endpoint</code>: the oauth2 authorization endpoint. Required if
+provider discovery is disabled.</p>
+</li>
+<li>
+<p><code>token_endpoint</code>: the oauth2 token endpoint. Required if provider discovery is
+disabled.</p>
+</li>
+<li>
+<p><code>userinfo_endpoint</code>: the OIDC userinfo endpoint. Required if discovery is
+disabled and the 'openid' scope is not requested.</p>
+</li>
+<li>
+<p><code>jwks_uri</code>: URI where to fetch the JWKS. Required if discovery is disabled and
+the 'openid' scope is used.</p>
+</li>
+<li>
+<p><code>skip_verification</code>: set to 'true' to skip metadata verification. Use this if
+you are connecting to a provider that is not OpenID Connect compliant.
+Defaults to false. Avoid this in production.</p>
+</li>
+<li>
+<p><code>user_profile_method</code>: Whether to fetch the user profile from the userinfo
+endpoint, or to rely on the data returned in the id_token from the <code>token_endpoint</code>.
+Valid values are: <code>auto</code> or <code>userinfo_endpoint</code>.
+Defaults to <code>auto</code>, which uses the userinfo endpoint if <code>openid</code> is
+not included in <code>scopes</code>. Set to <code>userinfo_endpoint</code> to always use the
+userinfo endpoint.</p>
+</li>
+<li>
+<p><code>allow_existing_users</code>: set to true to allow a user logging in via OIDC to
+match a pre-existing account instead of failing. This could be used if
+switching from password logins to OIDC. Defaults to false.</p>
+</li>
+<li>
+<p><code>user_mapping_provider</code>: Configuration for how attributes returned from a OIDC
+provider are mapped onto a matrix user. This setting has the following
+sub-properties:</p>
+<ul>
+<li>
+<p><code>module</code>: The class name of a custom mapping module. Default is
+<code>synapse.handlers.oidc.JinjaOidcMappingProvider</code>.
+See https://matrix-org.github.io/synapse/latest/sso_mapping_providers.html#openid-mapping-providers
+for information on implementing a custom mapping provider.</p>
+</li>
+<li>
+<p><code>config</code>: Configuration for the mapping provider module. This section will
+be passed as a Python dictionary to the user mapping provider
+module's <code>parse_config</code> method.</p>
+<p>For the default provider, the following settings are available:</p>
+<ul>
+<li>
+<p>subject_claim: name of the claim containing a unique identifier
+for the user. Defaults to 'sub', which OpenID Connect
+compliant providers should provide.</p>
+</li>
+<li>
+<p><code>localpart_template</code>: Jinja2 template for the localpart of the MXID.
+If this is not set, the user will be prompted to choose their
+own username (see the documentation for the <code>sso_auth_account_details.html</code> 
+template). This template can use the <code>localpart_from_email</code> filter.</p>
+</li>
+<li>
+<p><code>confirm_localpart</code>: Whether to prompt the user to validate (or
+change) the generated localpart (see the documentation for the
+'sso_auth_account_details.html' template), instead of
+registering the account right away.</p>
+</li>
+<li>
+<p><code>display_name_template</code>: Jinja2 template for the display name to set
+on first login. If unset, no displayname will be set.</p>
+</li>
+<li>
+<p><code>email_template</code>: Jinja2 template for the email address of the user.
+If unset, no email address will be added to the account.</p>
+</li>
+<li>
+<p><code>extra_attributes</code>: a map of Jinja2 templates for extra attributes
+to send back to the client during login. Note that these are non-standard and clients will ignore them
+without modifications.</p>
+</li>
+</ul>
+</li>
+</ul>
+<p>When rendering, the Jinja2 templates are given a 'user' variable,
+which is set to the claims returned by the UserInfo Endpoint and/or
+in the ID Token.</p>
+</li>
+</ul>
+<p>It is possible to configure Synapse to only allow logins if certain attributes 
+match particular values in the OIDC userinfo. The requirements can be listed under
+<code>attribute_requirements</code> as shown here:</p>
+<pre><code class="language-yaml">attribute_requirements:
+     - attribute: family_name
+       value: &quot;Stephensson&quot;
+     - attribute: groups
+       value: &quot;admin&quot;
+</code></pre>
+<p>All of the listed attributes must match for the login to be permitted. Additional attributes can be added to
+userinfo by expanding the <code>scopes</code> section of the OIDC config to retrieve
+additional information from the OIDC provider.</p>
+<p>If the OIDC claim is a list, then the attribute must match any value in the list.
+Otherwise, it must exactly match the value of the claim. Using the example 
+above, the <code>family_name</code> claim MUST be &quot;Stephensson&quot;, but the <code>groups</code>
+claim MUST contain &quot;admin&quot;.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">oidc_providers:
+  # Generic example
+  #
+  - idp_id: my_idp
+    idp_name: &quot;My OpenID provider&quot;
+    idp_icon: &quot;mxc://example.com/mediaid&quot;
+    discover: false
+    issuer: &quot;https://accounts.example.com/&quot;
+    client_id: &quot;provided-by-your-issuer&quot;
+    client_secret: &quot;provided-by-your-issuer&quot;
+    client_auth_method: client_secret_post
+    scopes: [&quot;openid&quot;, &quot;profile&quot;]
+    authorization_endpoint: &quot;https://accounts.example.com/oauth2/auth&quot;
+    token_endpoint: &quot;https://accounts.example.com/oauth2/token&quot;
+    userinfo_endpoint: &quot;https://accounts.example.com/userinfo&quot;
+    jwks_uri: &quot;https://accounts.example.com/.well-known/jwks.json&quot;
+    skip_verification: true
+    user_mapping_provider:
+      config:
+        subject_claim: &quot;id&quot;
+        localpart_template: &quot;{{ user.login }}&quot;
+        display_name_template: &quot;{{ user.name }}&quot;
+        email_template: &quot;{{ user.email }}&quot;
+    attribute_requirements:
+      - attribute: userGroup
+        value: &quot;synapseUsers&quot;
+</code></pre>
+<hr />
+<h3 id="cas_config"><a class="header" href="#cas_config"><code>cas_config</code></a></h3>
+<p>Enable Central Authentication Service (CAS) for registration and login.
+Has the following sub-options:</p>
+<ul>
+<li><code>enabled</code>: Set this to true to enable authorization against a CAS server.
+Defaults to false.</li>
+<li><code>server_url</code>: The URL of the CAS authorization endpoint.</li>
+<li><code>displayname_attribute</code>: The attribute of the CAS response to use as the display name.
+If no name is given here, no displayname will be set.</li>
+<li><code>required_attributes</code>:  It is possible to configure Synapse to only allow logins if CAS attributes
+match particular values. All of the keys given below must exist
+and the values must match the given value. Alternately if the given value
+is <code>None</code> then any value is allowed (the attribute just must exist).
+All of the listed attributes must match for the login to be permitted.</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">cas_config:
+  enabled: true
+  server_url: &quot;https://cas-server.com&quot;
+  displayname_attribute: name
+  required_attributes:
+    userGroup: &quot;staff&quot;
+    department: None
+</code></pre>
+<hr />
+<h3 id="sso"><a class="header" href="#sso"><code>sso</code></a></h3>
+<p>Additional settings to use with single-sign on systems such as OpenID Connect,
+SAML2 and CAS.</p>
+<p>Server admins can configure custom templates for pages related to SSO. See 
+<a href="../../templates.html">here</a> for more information.</p>
+<p>Options include:</p>
+<ul>
+<li><code>client_whitelist</code>: A list of client URLs which are whitelisted so that the user does not
+have to confirm giving access to their account to the URL. Any client
+whose URL starts with an entry in the following list will not be subject
+to an additional confirmation step after the SSO login is completed.
+WARNING: An entry such as &quot;https://my.client&quot; is insecure, because it
+will also match &quot;https://my.client.evil.site&quot;, exposing your users to
+phishing attacks from evil.site. To avoid this, include a slash after the
+hostname: &quot;https://my.client/&quot;.
+The login fallback page (used by clients that don't natively support the
+required login flows) is whitelisted in addition to any URLs in this list.
+By default, this list contains only the login fallback page.</li>
+<li><code>update_profile_information</code>: Use this setting to keep a user's profile fields in sync with information from
+the identity provider. Currently only syncing the displayname is supported. Fields 
+are checked on every SSO login, and are updated if necessary.
+Note that enabling this option will override user profile information,
+regardless of whether users have opted-out of syncing that
+information when first signing in. Defaults to false.</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">sso:
+    client_whitelist:
+      - https://riot.im/develop
+      - https://my.custom.client/
+    update_profile_information: true
+</code></pre>
+<hr />
+<h3 id="jwt_config"><a class="header" href="#jwt_config"><code>jwt_config</code></a></h3>
+<p>JSON web token integration. The following settings can be used to make
+Synapse JSON web tokens for authentication, instead of its internal
+password database.</p>
+<p>Each JSON Web Token needs to contain a &quot;sub&quot; (subject) claim, which is
+used as the localpart of the mxid.</p>
+<p>Additionally, the expiration time (&quot;exp&quot;), not before time (&quot;nbf&quot;),
+and issued at (&quot;iat&quot;) claims are validated if present.</p>
+<p>Note that this is a non-standard login type and client support is
+expected to be non-existent.</p>
+<p>See <a href="../../jwt.html">here</a> for more.</p>
+<p>Additional sub-options for this setting include:</p>
+<ul>
+<li><code>enabled</code>: Set to true to enable authorization using JSON web
+tokens. Defaults to false.</li>
+<li><code>secret</code>: This is either the private shared secret or the public key used to
+decode the contents of the JSON web token. Required if <code>enabled</code> is set to true.</li>
+<li><code>algorithm</code>: The algorithm used to sign (or HMAC) the JSON web token.
+Supported algorithms are listed
+<a href="https://docs.authlib.org/en/latest/specs/rfc7518.html">here (section JWS)</a>.
+Required if <code>enabled</code> is set to true.</li>
+<li><code>subject_claim</code>: Name of the claim containing a unique identifier for the user.
+Optional, defaults to <code>sub</code>.</li>
+<li><code>issuer</code>: The issuer to validate the &quot;iss&quot; claim against. Optional. If provided the 
+&quot;iss&quot; claim will be required and validated for all JSON web tokens.</li>
+<li><code>audiences</code>: A list of audiences to validate the &quot;aud&quot; claim against. Optional.
+If provided the &quot;aud&quot; claim will be required and validated for all JSON web tokens.
+Note that if the &quot;aud&quot; claim is included in a JSON web token then
+validation will fail without configuring audiences.</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">jwt_config:
+    enabled: true 
+    secret: &quot;provided-by-your-issuer&quot;
+    algorithm: &quot;provided-by-your-issuer&quot;
+    subject_claim: &quot;name_of_claim&quot;
+    issuer: &quot;provided-by-your-issuer&quot;
+    audiences:
+        - &quot;provided-by-your-issuer&quot;
+</code></pre>
+<hr />
+<h3 id="password_config"><a class="header" href="#password_config"><code>password_config</code></a></h3>
+<p>Use this setting to enable password-based logins. </p>
+<p>This setting has the following sub-options:</p>
+<ul>
+<li><code>enabled</code>: Defaults to true.
+Set to false to disable password authentication.
+Set to <code>only_for_reauth</code> to allow users with existing passwords to use them
+to log in and reauthenticate, whilst preventing new users from setting passwords.</li>
+<li><code>localdb_enabled</code>: Set to false to disable authentication against the local password
+database. This is ignored if <code>enabled</code> is false, and is only useful
+if you have other <code>password_providers</code>. Defaults to true. </li>
+<li><code>pepper</code>: Set the value here to a secret random string for extra security. # Uncomment and change to a secret random string for extra security.
+DO NOT CHANGE THIS AFTER INITIAL SETUP!</li>
+<li><code>policy</code>: Define and enforce a password policy, such as minimum lengths for passwords, etc. 
+Each parameter is optional. This is an implementation of MSC2000. Parameters are as follows:
+<ul>
+<li><code>enabled</code>: Defaults to false. Set to true to enable.</li>
+<li><code>minimum_length</code>: Minimum accepted length for a password. Defaults to 0.</li>
+<li><code>require_digit</code>: Whether a password must contain at least one digit.
+Defaults to false.</li>
+<li><code>require_symbol</code>: Whether a password must contain at least one symbol.
+A symbol is any character that's not a number or a letter. Defaults to false.</li>
+<li><code>require_lowercase</code>: Whether a password must contain at least one lowercase letter.
+Defaults to false.</li>
+<li><code>require_uppercase</code>: Whether a password must contain at least one uppercase letter.
+Defaults to false.</li>
+</ul>
+</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">password_config:
+   enabled: false
+   localdb_enabled: false
+   pepper: &quot;EVEN_MORE_SECRET&quot;
+
+   policy:
+      enabled: true
+      minimum_length: 15
+      require_digit: true
+      require_symbol: true
+      require_lowercase: true
+      require_uppercase: true
+</code></pre>
+<hr />
+<h3 id="ui_auth"><a class="header" href="#ui_auth"><code>ui_auth</code></a></h3>
+<p>The amount of time to allow a user-interactive authentication session to be active.</p>
+<p>This defaults to 0, meaning the user is queried for their credentials 
+before every action, but this can be overridden to allow a single
+validation to be re-used.  This weakens the protections afforded by
+the user-interactive authentication process, by allowing for multiple
+(and potentially different) operations to use the same validation session.</p>
+<p>This is ignored for potentially &quot;dangerous&quot; operations (including
+deactivating an account, modifying an account password, and
+adding a 3PID).</p>
+<p>Use the <code>session_timeout</code> sub-option here to change the time allowed for credential validation.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">ui_auth:
+    session_timeout: &quot;15s&quot;
+</code></pre>
+<hr />
+<h3 id="email"><a class="header" href="#email"><code>email</code></a></h3>
+<p>Configuration for sending emails from Synapse.</p>
+<p>Server admins can configure custom templates for email content. See
+<a href="../../templates.html">here</a> for more information.</p>
+<p>This setting has the following sub-options:</p>
+<ul>
+<li>
+<p><code>smtp_host</code>: The hostname of the outgoing SMTP server to use. Defaults to 'localhost'.</p>
+</li>
+<li>
+<p><code>smtp_port</code>: The port on the mail server for outgoing SMTP. Defaults to 25.</p>
+</li>
+<li>
+<p><code>smtp_user</code> and <code>smtp_pass</code>: Username/password for authentication to the SMTP server. By default, no
+authentication is attempted.</p>
+</li>
+<li>
+<p><code>require_transport_security</code>: Set to true to require TLS transport security for SMTP.
+By default, Synapse will connect over plain text, and will then switch to
+TLS via STARTTLS <em>if the SMTP server supports it</em>. If this option is set,
+Synapse will refuse to connect unless the server supports STARTTLS.</p>
+</li>
+<li>
+<p><code>enable_tls</code>: By default, if the server supports TLS, it will be used, and the server
+must present a certificate that is valid for 'smtp_host'. If this option
+is set to false, TLS will not be used.</p>
+</li>
+<li>
+<p><code>notif_from</code>: defines the &quot;From&quot; address to use when sending emails.
+It must be set if email sending is enabled. The placeholder '%(app)s' will be replaced by the application name,
+which is normally set in <code>app_name</code>, but may be overridden by the
+Matrix client application. Note that the placeholder must be written '%(app)s', including the
+trailing 's'.</p>
+</li>
+<li>
+<p><code>app_name</code>: <code>app_name</code> defines the default value for '%(app)s' in <code>notif_from</code> and email
+subjects. It defaults to 'Matrix'.</p>
+</li>
+<li>
+<p><code>enable_notifs</code>: Set to true to enable sending emails for messages that the user
+has missed. Disabled by default.</p>
+</li>
+<li>
+<p><code>notif_for_new_users</code>: Set to false to disable automatic subscription to email
+notifications for new users. Enabled by default.</p>
+</li>
+<li>
+<p><code>client_base_url</code>: Custom URL for client links within the email notifications. By default
+links will be based on &quot;https://matrix.to&quot;. (This setting used to be called <code>riot_base_url</code>;
+the old name is still supported for backwards-compatibility but is now deprecated.)</p>
+</li>
+<li>
+<p><code>validation_token_lifetime</code>: Configures the time that a validation email will expire after sending.
+Defaults to 1h.</p>
+</li>
+<li>
+<p><code>invite_client_location</code>: The web client location to direct users to during an invite. This is passed
+to the identity server as the <code>org.matrix.web_client_location</code> key. Defaults
+to unset, giving no guidance to the identity server.</p>
+</li>
+<li>
+<p><code>subjects</code>: Subjects to use when sending emails from Synapse. The placeholder '%(app)s' will
+be replaced with the value of the <code>app_name</code> setting, or by a value dictated by the Matrix client application.
+In addition, each subject can use the following placeholders: '%(person)s', which will be replaced by the displayname
+of the user(s) that sent the message(s), e.g. &quot;Alice and Bob&quot;, and '%(room)s', which will be replaced by the name of the room the
+message(s) have been sent to, e.g. &quot;My super room&quot;. In addition, emails related to account administration will
+can use the '%(server_name)s' placeholder, which will be replaced by the value of the
+<code>server_name</code> setting in your Synapse configuration.</p>
+<p>Here is a list of subjects for notification emails that can be set: </p>
+<ul>
+<li><code>message_from_person_in_room</code>: Subject to use to notify about one message from one or more user(s) in a
+room which has a name. Defaults to &quot;[%(app)s] You have a message on %(app)s from %(person)s in the %(room)s room...&quot;</li>
+<li><code>message_from_person</code>: Subject to use to notify about one message from one or more user(s) in a
+room which doesn't have a name. Defaults to &quot;[%(app)s] You have a message on %(app)s from %(person)s...&quot;</li>
+<li><code>messages_from_person</code>: Subject to use to notify about multiple messages from one or more users in
+a room which doesn't have a name. Defaults to &quot;[%(app)s] You have messages on %(app)s from %(person)s...&quot;</li>
+<li><code>messages_in_room</code>: Subject to use to notify about multiple messages in a room which has a
+name. Defaults to &quot;[%(app)s] You have messages on %(app)s in the %(room)s room...&quot;</li>
+<li><code>messages_in_room_and_others</code>: Subject to use to notify about multiple messages in multiple rooms. 
+Defaults to &quot;[%(app)s] You have messages on %(app)s in the %(room)s room and others...&quot;</li>
+<li><code>messages_from_person_and_others</code>: Subject to use to notify about multiple messages from multiple persons in
+multiple rooms. This is similar to the setting above except it's used when
+the room in which the notification was triggered has no name. Defaults to 
+&quot;[%(app)s] You have messages on %(app)s from %(person)s and others...&quot;</li>
+<li><code>invite_from_person_to_room</code>: Subject to use to notify about an invite to a room which has a name. 
+Defaults to  &quot;[%(app)s] %(person)s has invited you to join the %(room)s room on %(app)s...&quot;</li>
+<li><code>invite_from_person</code>: Subject to use to notify about an invite to a room which doesn't have a
+name. Defaults to &quot;[%(app)s] %(person)s has invited you to chat on %(app)s...&quot;</li>
+<li><code>password_reset</code>: Subject to use when sending a password reset email. Defaults to &quot;[%(server_name)s] Password reset&quot;</li>
+<li><code>email_validation</code>: Subject to use when sending a verification email to assert an address's
+ownership. Defaults to &quot;[%(server_name)s] Validate your email&quot;</li>
+</ul>
+</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">email:
+  smtp_host: mail.server
+  smtp_port: 587
+  smtp_user: &quot;exampleusername&quot;
+  smtp_pass: &quot;examplepassword&quot;
+  require_transport_security: true
+  enable_tls: false
+  notif_from: &quot;Your Friendly %(app)s homeserver &lt;noreply@example.com&gt;&quot;
+  app_name: my_branded_matrix_server
+  enable_notifs: true
+  notif_for_new_users: false
+  client_base_url: &quot;http://localhost/riot&quot;
+  validation_token_lifetime: 15m
+  invite_client_location: https://app.element.io
+
+  subjects:
+    message_from_person_in_room: &quot;[%(app)s] You have a message on %(app)s from %(person)s in the %(room)s room...&quot;
+    message_from_person: &quot;[%(app)s] You have a message on %(app)s from %(person)s...&quot;
+    messages_from_person: &quot;[%(app)s] You have messages on %(app)s from %(person)s...&quot;
+    messages_in_room: &quot;[%(app)s] You have messages on %(app)s in the %(room)s room...&quot;
+    messages_in_room_and_others: &quot;[%(app)s] You have messages on %(app)s in the %(room)s room and others...&quot;
+    messages_from_person_and_others: &quot;[%(app)s] You have messages on %(app)s from %(person)s and others...&quot;
+    invite_from_person_to_room: &quot;[%(app)s] %(person)s has invited you to join the %(room)s room on %(app)s...&quot;
+    invite_from_person: &quot;[%(app)s] %(person)s has invited you to chat on %(app)s...&quot;
+    password_reset: &quot;[%(server_name)s] Password reset&quot;
+    email_validation: &quot;[%(server_name)s] Validate your email&quot;
+</code></pre>
+<hr />
+<h2 id="push"><a class="header" href="#push">Push</a></h2>
+<p>Configuration settings related to push notifications</p>
+<hr />
+<h3 id="push-1"><a class="header" href="#push-1"><code>push</code></a></h3>
+<p>This setting defines options for push notifications. </p>
+<p>This option has a number of sub-options. They are as follows:</p>
+<ul>
+<li><code>include_content</code>: Clients requesting push notifications can either have the body of
+the message sent in the notification poke along with other details
+like the sender, or just the event ID and room ID (<code>event_id_only</code>).
+If clients choose the to have the body sent, this option controls whether the
+notification request includes the content of the event (other details
+like the sender are still included). If <code>event_id_only</code> is enabled, it
+has no effect.
+For modern android devices the notification content will still appear
+because it is loaded by the app. iPhone, however will send a
+notification saying only that a message arrived and who it came from.
+Defaults to true. Set to false to only include the event ID and room ID in push notification payloads.</li>
+<li><code>group_unread_count_by_room: false</code>: When a push notification is received, an unread count is also sent.
+This number can either be calculated as the number of unread messages  for the user, or the number of <em>rooms</em> the 
+user has unread messages in. Defaults to true, meaning push clients will see the number of
+rooms with unread messages in them. Set to false to instead send the number
+of unread messages.</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">push:
+  include_content: false
+  group_unread_count_by_room: false
+</code></pre>
+<hr />
+<h2 id="rooms"><a class="header" href="#rooms">Rooms</a></h2>
+<p>Config options relating to rooms.</p>
+<hr />
+<h3 id="encryption_enabled_by_default"><a class="header" href="#encryption_enabled_by_default"><code>encryption_enabled_by_default</code></a></h3>
+<p>Controls whether locally-created rooms should be end-to-end encrypted by
+default.</p>
+<p>Possible options are &quot;all&quot;, &quot;invite&quot;, and &quot;off&quot;. They are defined as:</p>
+<ul>
+<li>&quot;all&quot;: any locally-created room</li>
+<li>&quot;invite&quot;: any room created with the <code>private_chat</code> or <code>trusted_private_chat</code>
+room creation presets</li>
+<li>&quot;off&quot;: this option will take no effect</li>
+</ul>
+<p>The default value is &quot;off&quot;.</p>
+<p>Note that this option will only affect rooms created after it is set. It
+will also not affect rooms created by other servers.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">encryption_enabled_by_default_for_room_type: invite
+</code></pre>
+<hr />
+<h3 id="user_directory"><a class="header" href="#user_directory"><code>user_directory</code></a></h3>
+<p>This setting defines options related to the user directory. </p>
+<p>This option has the following sub-options:</p>
+<ul>
+<li><code>enabled</code>:  Defines whether users can search the user directory. If false then
+empty responses are returned to all queries. Defaults to true.</li>
+<li><code>search_all_users</code>: Defines whether to search all users visible to your HS when searching
+the user directory. If false, search results will only contain users
+visible in public rooms and users sharing a room with the requester.
+Defaults to false.
+NB. If you set this to true, and the last time the user_directory search
+indexes were (re)built was before Synapse 1.44, you'll have to
+rebuild the indexes in order to search through all known users.
+These indexes are built the first time Synapse starts; admins can
+manually trigger a rebuild via API following the instructions at
+https://matrix-org.github.io/synapse/latest/usage/administration/admin_api/background_updates.html#run
+Set to true to return search results containing all known users, even if that
+user does not share a room with the requester.</li>
+<li><code>prefer_local_users</code>: Defines whether to prefer local users in search query results.
+If set to true, local users are more likely to appear above remote users when searching the 
+user directory. Defaults to false.</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">user_directory:
+    enabled: false
+    search_all_users: true
+    prefer_local_users: true
+</code></pre>
+<hr />
+<h3 id="user_consent"><a class="header" href="#user_consent"><code>user_consent</code></a></h3>
+<p>For detailed instructions on user consent configuration, see <a href="../../consent_tracking.html">here</a>.</p>
+<p>Parts of this section are required if enabling the <code>consent</code> resource under
+<code>listeners</code>, in particular <code>template_dir</code> and <code>version</code>. # TODO: link <code>listeners</code></p>
+<ul>
+<li>
+<p><code>template_dir</code>: gives the location of the templates for the HTML forms.
+This directory should contain one subdirectory per language (eg, <code>en</code>, <code>fr</code>),
+and each language directory should contain the policy document (named as
+<version>.html) and a success page (success.html).</p>
+</li>
+<li>
+<p><code>version</code>: specifies the 'current' version of the policy document. It defines
+the version to be served by the consent resource if there is no 'v'
+parameter.</p>
+</li>
+<li>
+<p><code>server_notice_content</code>: if enabled, will send a user a &quot;Server Notice&quot;
+asking them to consent to the privacy policy. The <code>server_notices</code> section ##TODO: link
+must also be configured for this to work. Notices will <em>not</em> be sent to
+guest users unless <code>send_server_notice_to_guests</code> is set to true.</p>
+</li>
+<li>
+<p><code>block_events_error</code>, if set, will block any attempts to send events
+until the user consents to the privacy policy. The value of the setting is
+used as the text of the error.</p>
+</li>
+<li>
+<p><code>require_at_registration</code>, if enabled, will add a step to the registration
+process, similar to how captcha works. Users will be required to accept the
+policy before their account is created.</p>
+</li>
+<li>
+<p><code>policy_name</code> is the display name of the policy users will see when registering
+for an account. Has no effect unless <code>require_at_registration</code> is enabled.
+Defaults to &quot;Privacy Policy&quot;.</p>
+</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">user_consent:
+  template_dir: res/templates/privacy
+  version: 1.0
+  server_notice_content:
+    msgtype: m.text
+    body: &gt;-
+      To continue using this homeserver you must review and agree to the
+      terms and conditions at %(consent_uri)s
+  send_server_notice_to_guests: true
+  block_events_error: &gt;-
+    To continue using this homeserver you must review and agree to the
+    terms and conditions at %(consent_uri)s
+  require_at_registration: false
+  policy_name: Privacy Policy
+</code></pre>
+<hr />
+<h3 id="stats"><a class="header" href="#stats"><code>stats</code></a></h3>
+<p>Settings for local room and user statistics collection. See <a href="../../room_and_user_statistics.html">here</a>
+for more. </p>
+<ul>
+<li><code>enabled</code>: Set to false to disable room and user statistics. Note that doing
+so may cause certain features (such as the room directory) not to work
+correctly. Defaults to true. </li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">stats:  
+  enabled: false
+</code></pre>
+<hr />
+<h3 id="server_notices"><a class="header" href="#server_notices"><code>server_notices</code></a></h3>
+<p>Use this setting to enable a room which can be used to send notices
+from the server to users. It is a special room which users cannot leave; notices
+in the room come from a special &quot;notices&quot; user id.</p>
+<p>If you use this setting, you <em>must</em> define the <code>system_mxid_localpart</code>
+sub-setting, which defines the id of the user which will be used to send the
+notices.</p>
+<p>Sub-options for this setting include:</p>
+<ul>
+<li><code>system_mxid_display_name</code>: set the display name of the &quot;notices&quot; user</li>
+<li><code>system_mxid_avatar_url</code>: set the avatar for the &quot;notices&quot; user</li>
+<li><code>room_name</code>: set the room name of the server notices room</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">server_notices:
+  system_mxid_localpart: notices
+  system_mxid_display_name: &quot;Server Notices&quot;
+  system_mxid_avatar_url: &quot;mxc://server.com/oumMVlgDnLYFaPVkExemNVVZ&quot;
+  room_name: &quot;Server Notices&quot;
+</code></pre>
+<hr />
+<h3 id="enable_room_list_search"><a class="header" href="#enable_room_list_search"><code>enable_room_list_search</code></a></h3>
+<p>Set to false to disable searching the public room list. When disabled
+blocks searching local and remote room lists for local and remote
+users by always returning an empty list for all queries. Defaults to true. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">enable_room_list_search: false
+</code></pre>
+<hr />
+<h3 id="alias_creation"><a class="header" href="#alias_creation"><code>alias_creation</code></a></h3>
+<p>The <code>alias_creation</code> option controls who is allowed to create aliases
+on this server.</p>
+<p>The format of this option is a list of rules that contain globs that
+match against user_id, room_id and the new alias (fully qualified with
+server name). The action in the first rule that matches is taken,
+which can currently either be &quot;allow&quot; or &quot;deny&quot;.</p>
+<p>Missing user_id/room_id/alias fields default to &quot;*&quot;.</p>
+<p>If no rules match the request is denied. An empty list means no one
+can create aliases.</p>
+<p>Options for the rules include:</p>
+<ul>
+<li><code>user_id</code>: Matches against the creator of the alias. Defaults to &quot;*&quot;.</li>
+<li><code>alias</code>: Matches against the alias being created. Defaults to &quot;*&quot;.</li>
+<li><code>room_id</code>: Matches against the room ID the alias is being pointed at. Defaults to &quot;*&quot;</li>
+<li><code>action</code>: Whether to &quot;allow&quot; or &quot;deny&quot; the request if the rule matches. Defaults to allow. </li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">alias_creation_rules:
+  - user_id: &quot;bad_user&quot;
+    alias: &quot;spammy_alias&quot;
+    room_id: &quot;*&quot;
+    action: deny
+</code></pre>
+<hr />
+<p>Config options: <code>room_list_publication_rules</code></p>
+<p>The <code>room_list_publication_rules</code> option controls who can publish and
+which rooms can be published in the public room list.</p>
+<p>The format of this option is the same as that for
+<code>alias_creation_rules</code>.</p>
+<p>If the room has one or more aliases associated with it, only one of
+the aliases needs to match the alias rule. If there are no aliases
+then only rules with <code>alias: *</code> match.</p>
+<p>If no rules match the request is denied. An empty list means no one
+can publish rooms.</p>
+<p>Options for the rules include:</p>
+<ul>
+<li><code>user_id</code>: Matches against the creator of the alias. Defaults to &quot;*&quot;.</li>
+<li><code>alias</code>: Matches against any current local or canonical aliases associated with the room. Defaults to &quot;*&quot;.</li>
+<li><code>room_id</code>: Matches against the room ID being published. Defaults to &quot;*&quot;.</li>
+<li><code>action</code>: Whether to &quot;allow&quot; or &quot;deny&quot; the request if the rule matches. Defaults to allow. </li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">room_list_publication_rules:
+  - user_id: &quot;*&quot;
+    alias: &quot;*&quot;
+    room_id: &quot;*&quot;
+    action: allow
+</code></pre>
+<hr />
+<h3 id="default_power_level_content_override"><a class="header" href="#default_power_level_content_override"><code>default_power_level_content_override</code></a></h3>
+<p>The <code>default_power_level_content_override</code> option controls the default power
+levels for rooms.</p>
+<p>Useful if you know that your users need special permissions in rooms
+that they create (e.g. to send particular types of state events without
+needing an elevated power level).  This takes the same shape as the
+<code>power_level_content_override</code> parameter in the /createRoom API, but
+is applied before that parameter.</p>
+<p>Note that each key provided inside a preset (for example <code>events</code> in the example
+below) will overwrite all existing defaults inside that key. So in the example
+below, newly-created private_chat rooms will have no rules for any event types
+except <code>com.example.foo</code>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">default_power_level_content_override:
+   private_chat: { &quot;events&quot;: { &quot;com.example.foo&quot; : 0 } }
+   trusted_private_chat: null
+   public_chat: null
+</code></pre>
+<hr />
+<h2 id="opentracing"><a class="header" href="#opentracing">Opentracing</a></h2>
+<p>Configuration options related to Opentracing support.</p>
+<hr />
+<h3 id="opentracing-1"><a class="header" href="#opentracing-1"><code>opentracing</code></a></h3>
+<p>These settings enable and configure opentracing, which implements distributed tracing.
+This allows you to observe the causal chains of events across servers
+including requests, key lookups etc., across any server running
+synapse or any other services which support opentracing
+(specifically those implemented with Jaeger).</p>
+<p>Sub-options include:</p>
+<ul>
+<li><code>enabled</code>: whether tracing is enabled. Set to true to enable. Disabled by default.</li>
+<li><code>homeserver_whitelist</code>: The list of homeservers we wish to send and receive span contexts and span baggage.
+See <a href="../../opentracing.html">here</a> for more. 
+This is a list of regexes which are matched against the <code>server_name</code> of the homeserver.
+By default, it is empty, so no servers are matched.</li>
+<li><code>force_tracing_for_users</code>: # A list of the matrix IDs of users whose requests will always be traced,
+even if the tracing system would otherwise drop the traces due to probabilistic sampling.
+By default, the list is empty.</li>
+<li><code>jaeger_config</code>: Jaeger can be configured to sample traces at different rates.
+All configuration options provided by Jaeger can be set here. Jaeger's configuration is 
+mostly related to trace sampling which is documented <a href="https://www.jaegertracing.io/docs/latest/sampling/">here</a>.</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">opentracing:
+    enabled: true
+    homeserver_whitelist:
+      - &quot;.*&quot;
+    force_tracing_for_users:
+      - &quot;@user1:server_name&quot;
+      - &quot;@user2:server_name&quot;
+
+    jaeger_config:
+      sampler:
+        type: const
+        param: 1
+      logging:
+        false
+</code></pre>
+<hr />
+<h2 id="workers"><a class="header" href="#workers">Workers</a></h2>
+<p>Configuration options related to workers.</p>
+<hr />
+<h3 id="send_federation"><a class="header" href="#send_federation"><code>send_federation</code></a></h3>
+<p>Controls sending of outbound federation transactions on the main process.
+Set to false if using a federation sender worker. Defaults to true. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">send_federation: false
+</code></pre>
+<hr />
+<h3 id="federation_sender_instances"><a class="header" href="#federation_sender_instances"><code>federation_sender_instances</code></a></h3>
+<p>It is possible to run multiple federation sender workers, in which case the
+work is balanced across them. Use this setting to list the senders. </p>
+<p>This configuration setting must be shared between all federation sender workers, and if
+changed all federation sender workers must be stopped at the same time and then
+started, to ensure that all instances are running with the same config (otherwise
+events may be dropped). </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">federation_sender_instances:
+  - federation_sender1
+</code></pre>
+<hr />
+<h3 id="instance_map"><a class="header" href="#instance_map"><code>instance_map</code></a></h3>
+<p>When using workers this should be a map from worker name to the
+HTTP replication listener of the worker, if configured. </p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">instance_map:
+  worker1:
+    host: localhost
+    port: 8034
+</code></pre>
+<hr />
+<h3 id="stream_writers"><a class="header" href="#stream_writers"><code>stream_writers</code></a></h3>
+<p>Experimental: When using workers you can define which workers should
+handle event persistence and typing notifications. Any worker
+specified here must also be in the <code>instance_map</code>.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">stream_writers:
+  events: worker1
+  typing: worker1
+</code></pre>
+<hr />
+<h3 id="run_background_tasks_on"><a class="header" href="#run_background_tasks_on"><code>run_background_tasks_on</code></a></h3>
+<p>The worker that is used to run background tasks (e.g. cleaning up expired
+data). If not provided this defaults to the main process.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">run_background_tasks_on: worker1
+</code></pre>
+<hr />
+<h3 id="worker_replication_secret"><a class="header" href="#worker_replication_secret"><code>worker_replication_secret</code></a></h3>
+<p>A shared secret used by the replication APIs to authenticate HTTP requests
+from workers.</p>
+<p>By default this is unused and traffic is not authenticated.</p>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">worker_replication_secret: &quot;secret_secret&quot;
+</code></pre>
+<h3 id="redis"><a class="header" href="#redis"><code>redis</code></a></h3>
+<p>Configuration for Redis when using workers. This <em>must</em> be enabled when
+using workers (unless using old style direct TCP configuration).
+This setting has the following sub-options:</p>
+<ul>
+<li><code>enabled</code>: whether to use Redis support. Defaults to false. </li>
+<li><code>host</code> and <code>port</code>: Optional host and port to use to connect to redis. Defaults to
+localhost and 6379</li>
+<li><code>password</code>: Optional password if configured on the Redis instance.</li>
+</ul>
+<p>Example configuration:</p>
+<pre><code class="language-yaml">redis:
+  enabled: true
+  host: localhost
+  port: 6379
+  password: &lt;secret_password&gt;
+</code></pre>
+<h2 id="background-updates"><a class="header" href="#background-updates">Background Updates</a></h2>
+<p>Configuration settings related to background updates. </p>
+<hr />
+<h3 id="background_updates"><a class="header" href="#background_updates"><code>background_updates</code></a></h3>
+<p>Background updates are database updates that are run in the background in batches.
+The duration, minimum batch size, default batch size, whether to sleep between batches and if so, how long to
+sleep can all be configured. This is helpful to speed up or slow down the updates.
+This setting has the following sub-options:</p>
+<ul>
+<li><code>background_update_duration_ms</code>: How long in milliseconds to run a batch of background updates for. Defaults to 100. 
+Set a different time to change the default.</li>
+<li><code>sleep_enabled</code>: Whether to sleep between updates. Defaults to true. Set to false to change the default.</li>
+<li><code>sleep_duration_ms</code>: If sleeping between updates, how long in milliseconds to sleep for. Defaults to 1000.
+Set a duration to change the default.</li>
+<li><code>min_batch_size</code>: Minimum size a batch of background updates can be. Must be greater than 0. Defaults to 1.
+Set a size to change the default.</li>
+<li><code>default_batch_size</code>: The batch size to use for the first iteration of a new background update. The default is 100.
+Set a size to change the default.</li>
+</ul>
+<p>Example configuration: </p>
+<pre><code class="language-yaml">background_updates:
+    background_update_duration_ms: 500
+    sleep_enabled: false
+    sleep_duration_ms: 300
+    min_batch_size: 10
+    default_batch_size: 50
+</code></pre>
+
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+
+                        <h1 id="homeserver-sample-configuration-file"><a class="header" href="#homeserver-sample-configuration-file">Homeserver Sample Configuration File</a></h1>
+<p>Below is a sample homeserver configuration file. The homeserver configuration file 
+can be tweaked to change the behaviour of your homeserver. A restart of the server is 
+generally required to apply any changes made to this file.</p>
+<p>Note that the contents below are <em>not</em> intended to be copied and used as the basis for
+a real homeserver.yaml. Instead, if you are starting from scratch, please generate
+a fresh config using Synapse by following the instructions in
+<a href="../../setup/installation.html">Installation</a>.</p>
+<pre><code class="language-yaml"># This file is maintained as an up-to-date snapshot of the default
+# homeserver.yaml configuration generated by Synapse. You can find a
+# complete accounting of possible configuration options at
+# https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html
+#
+# It is *not* intended to be copied and used as the basis for a real
+# homeserver.yaml. Instead, if you are starting from scratch, please generate
+# a fresh config using Synapse by following the instructions in
+# https://matrix-org.github.io/synapse/latest/setup/installation.html.
+#
+################################################################################
+
+# Configuration file for Synapse.
+#
+# This is a YAML file: see [1] for a quick introduction. Note in particular
+# that *indentation is important*: all the elements of a list or dictionary
+# should have the same indentation.
+#
+# [1] https://docs.ansible.com/ansible/latest/reference_appendices/YAMLSyntax.html
+#
+# For more information on how to configure Synapse, including a complete accounting of
+# each option, go to docs/usage/configuration/config_documentation.md or
+# https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html
+server_name: &quot;SERVERNAME&quot;
+pid_file: DATADIR/homeserver.pid
+listeners:
+  - port: 8008
+    tls: false
+    type: http
+    x_forwarded: true
+    bind_addresses: ['::1', '127.0.0.1']
+    resources:
+      - names: [client, federation]
+        compress: false
+database:
+  name: sqlite3
+  args:
+    database: DATADIR/homeserver.db
+log_config: &quot;CONFDIR/SERVERNAME.log.config&quot;
+media_store_path: DATADIR/media_store
+signing_key_path: &quot;CONFDIR/SERVERNAME.signing.key&quot;
+trusted_key_servers:
+  - server_name: &quot;matrix.org&quot;
+</code></pre>
+
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diff --git a/v1.62/usage/configuration/index.html b/v1.62/usage/configuration/index.html
new file mode 100644
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+                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="../../welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="../../setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="../../postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="../../reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="../../setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="../../turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="../../delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item 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href="../../admin_api/user_admin_api.html">Users</a></li><li class="chapter-item expanded "><a href="../../admin_api/version_api.html">Server Version</a></li><li class="chapter-item expanded "><a href="../../usage/administration/admin_api/federation.html">Federation</a></li></ol></li><li class="chapter-item expanded "><a href="../../manhole.html">Manhole</a></li><li class="chapter-item expanded "><a href="../../metrics-howto.html">Monitoring</a></li><li class="chapter-item expanded "><a href="../../usage/administration/understanding_synapse_through_grafana_graphs.html">Understanding Synapse Through Grafana Graphs</a></li><li class="chapter-item expanded "><a href="../../usage/administration/useful_sql_for_admins.html">Useful SQL for Admins</a></li><li class="chapter-item expanded "><a href="../../usage/administration/database_maintenance_tools.html">Database Maintenance Tools</a></li><li class="chapter-item expanded "><a href="../../usage/administration/state_groups.html">State Groups</a></li><li class="chapter-item expanded "><a href="../../usage/administration/request_log.html">Request log format</a></li><li class="chapter-item expanded "><a href="../../usage/administration/admin_faq.html">Admin FAQ</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a href="../../development/contributing_guide.html">Contributing Guide</a></li><li class="chapter-item expanded "><a href="../../code_style.html">Code Style</a></li><li class="chapter-item expanded "><a href="../../development/releases.html">Release Cycle</a></li><li class="chapter-item expanded "><a href="../../development/git.html">Git Usage</a></li><li class="chapter-item expanded "><div>Testing</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../development/demo.html">Demo scripts</a></li></ol></li><li class="chapter-item expanded "><a href="../../opentracing.html">OpenTracing</a></li><li class="chapter-item expanded "><a href="../../development/database_schema.html">Database Schemas</a></li><li class="chapter-item expanded "><a href="../../development/experimental_features.html">Experimental features</a></li><li class="chapter-item expanded "><a href="../../development/dependencies.html">Dependency management</a></li><li class="chapter-item expanded "><div>Synapse Architecture</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../development/synapse_architecture/cancellation.html">Cancellation</a></li><li class="chapter-item expanded "><a href="../../log_contexts.html">Log Contexts</a></li><li class="chapter-item expanded "><a href="../../replication.html">Replication</a></li><li class="chapter-item expanded "><a href="../../tcp_replication.html">TCP Replication</a></li></ol></li><li class="chapter-item expanded "><a href="../../development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../development/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="../../development/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><a href="../../development/room-dag-concepts.html">Room DAG concepts</a></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="../../media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="../../room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="../../deprecation_policy.html">Dependency Deprecation Policy</a></li><li class="chapter-item expanded "><a href="../../other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol>
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+                        <!-- Page table of contents -->
+                        <div class="sidetoc">
+                            <nav class="pagetoc"></nav>
+                        </div>
+
+                        <h1 id="configuration"><a class="header" href="#configuration">Configuration</a></h1>
+<p>This section contains information on tweaking Synapse via the various options in the configuration file. A configuration
+file should have been generated when you <a href="../../setup/installation.html">installed Synapse</a>.</p>
+
+                    </main>
+
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diff --git a/v1.62/usage/configuration/logging_sample_config.html b/v1.62/usage/configuration/logging_sample_config.html
new file mode 100644
index 0000000000..1a93c04588
--- /dev/null
+++ b/v1.62/usage/configuration/logging_sample_config.html
@@ -0,0 +1,275 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>Logging Sample Config File - Synapse</title>
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+        <meta name="viewport" content="width=device-width, initial-scale=1">
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+        <link rel="shortcut icon" href="../../favicon.png">
+        <link rel="stylesheet" href="../../css/variables.css">
+        <link rel="stylesheet" href="../../css/general.css">
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+    <body>
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+
+        <!-- Work around some values being stored in localStorage wrapped in quotes -->
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+            try {
+                var theme = localStorage.getItem('mdbook-theme');
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+                if (theme.startsWith('"') && theme.endsWith('"')) {
+                    localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
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+                if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
+                    localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
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+        </script>
+
+        <!-- Set the theme before any content is loaded, prevents flash -->
+        <script type="text/javascript">
+            var theme;
+            try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
+            if (theme === null || theme === undefined) { theme = default_theme; }
+            var html = document.querySelector('html');
+            html.classList.remove('no-js')
+            html.classList.remove('light')
+            html.classList.add(theme);
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+        </script>
+
+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div class="sidebar-scrollbox">
+                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="../../welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="../../setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="../../postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="../../reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="../../setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="../../turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="../../delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a href="../../upgrade.html">Upgrading between Synapse Versions</a></li><li class="chapter-item expanded affix "><li class="part-title">Usage</li><li class="chapter-item expanded "><a href="../../federate.html">Federation</a></li><li class="chapter-item expanded "><a href="../../usage/configuration/index.html">Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../usage/configuration/config_documentation.html">Configuration Manual</a></li><li class="chapter-item expanded "><a href="../../usage/configuration/homeserver_sample_config.html">Homeserver Sample Config File</a></li><li class="chapter-item expanded "><a href="../../usage/configuration/logging_sample_config.html" class="active">Logging Sample Config File</a></li><li class="chapter-item expanded "><a href="../../structured_logging.html">Structured Logging</a></li><li class="chapter-item expanded "><a href="../../templates.html">Templates</a></li><li class="chapter-item expanded "><a href="../../usage/configuration/user_authentication/index.html">User Authentication</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../usage/configuration/user_authentication/single_sign_on/index.html">Single-Sign On</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../openid.html">OpenID Connect</a></li><li class="chapter-item expanded "><a href="../../usage/configuration/user_authentication/single_sign_on/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="../../usage/configuration/user_authentication/single_sign_on/cas.html">CAS</a></li><li class="chapter-item expanded "><a href="../../sso_mapping_providers.html">SSO Mapping Providers</a></li></ol></li><li class="chapter-item expanded "><a href="../../password_auth_providers.html">Password Auth Providers</a></li><li class="chapter-item expanded "><a href="../../jwt.html">JSON Web Tokens</a></li><li class="chapter-item expanded "><a href="../../usage/configuration/user_authentication/refresh_tokens.html">Refresh Tokens</a></li></ol></li><li class="chapter-item expanded "><a href="../../CAPTCHA_SETUP.html">Registration Captcha</a></li><li class="chapter-item expanded "><a href="../../application_services.html">Application Services</a></li><li class="chapter-item expanded "><a href="../../server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="../../consent_tracking.html">Consent Tracking</a></li><li class="chapter-item expanded "><a href="../../development/url_previews.html">URL Previews</a></li><li class="chapter-item expanded "><a href="../../user_directory.html">User Directory</a></li><li class="chapter-item expanded "><a href="../../message_retention_policies.html">Message Retention Policies</a></li><li class="chapter-item expanded "><a href="../../modules/index.html">Pluggable Modules</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../modules/writing_a_module.html">Writing a module</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../modules/spam_checker_callbacks.html">Spam checker callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/third_party_rules_callbacks.html">Third-party rules callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/presence_router_callbacks.html">Presence router callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/account_validity_callbacks.html">Account validity callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/password_auth_provider_callbacks.html">Password auth provider callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/background_update_controller_callbacks.html">Background update controller callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/account_data_callbacks.html">Account data callbacks</a></li><li class="chapter-item expanded "><a href="../../modules/porting_legacy_module.html">Porting a legacy module to the new interface</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../../workers.html">Workers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../synctl_workers.html">Using synctl with Workers</a></li><li class="chapter-item expanded "><a href="../../systemd-with-workers/index.html">Systemd</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../../usage/administration/index.html">Administration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../usage/administration/admin_api/index.html">Admin API</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../admin_api/account_validity.html">Account Validity</a></li><li class="chapter-item expanded "><a href="../../usage/administration/admin_api/background_updates.html">Background Updates</a></li><li class="chapter-item expanded "><a href="../../admin_api/event_reports.html">Event Reports</a></li><li class="chapter-item expanded "><a href="../../admin_api/media_admin_api.html">Media</a></li><li class="chapter-item expanded "><a href="../../admin_api/purge_history_api.html">Purge History</a></li><li class="chapter-item expanded "><a href="../../admin_api/register_api.html">Register Users</a></li><li class="chapter-item expanded "><a href="../../usage/administration/admin_api/registration_tokens.html">Registration Tokens</a></li><li class="chapter-item expanded "><a href="../../admin_api/room_membership.html">Manipulate Room Membership</a></li><li class="chapter-item expanded "><a href="../../admin_api/rooms.html">Rooms</a></li><li class="chapter-item expanded "><a href="../../admin_api/server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="../../admin_api/statistics.html">Statistics</a></li><li class="chapter-item expanded "><a href="../../admin_api/user_admin_api.html">Users</a></li><li class="chapter-item expanded "><a href="../../admin_api/version_api.html">Server Version</a></li><li class="chapter-item expanded "><a href="../../usage/administration/admin_api/federation.html">Federation</a></li></ol></li><li class="chapter-item expanded "><a href="../../manhole.html">Manhole</a></li><li class="chapter-item expanded "><a href="../../metrics-howto.html">Monitoring</a></li><li class="chapter-item expanded "><a href="../../usage/administration/understanding_synapse_through_grafana_graphs.html">Understanding Synapse Through Grafana Graphs</a></li><li class="chapter-item expanded "><a href="../../usage/administration/useful_sql_for_admins.html">Useful SQL for Admins</a></li><li class="chapter-item expanded "><a href="../../usage/administration/database_maintenance_tools.html">Database Maintenance Tools</a></li><li class="chapter-item expanded "><a href="../../usage/administration/state_groups.html">State Groups</a></li><li class="chapter-item expanded "><a href="../../usage/administration/request_log.html">Request log format</a></li><li class="chapter-item expanded "><a href="../../usage/administration/admin_faq.html">Admin FAQ</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a href="../../development/contributing_guide.html">Contributing Guide</a></li><li class="chapter-item expanded "><a href="../../code_style.html">Code Style</a></li><li class="chapter-item expanded "><a href="../../development/releases.html">Release Cycle</a></li><li class="chapter-item expanded "><a href="../../development/git.html">Git Usage</a></li><li class="chapter-item expanded "><div>Testing</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../development/demo.html">Demo scripts</a></li></ol></li><li class="chapter-item expanded "><a href="../../opentracing.html">OpenTracing</a></li><li class="chapter-item expanded "><a href="../../development/database_schema.html">Database Schemas</a></li><li class="chapter-item expanded "><a href="../../development/experimental_features.html">Experimental features</a></li><li class="chapter-item expanded "><a href="../../development/dependencies.html">Dependency management</a></li><li class="chapter-item expanded "><div>Synapse Architecture</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../development/synapse_architecture/cancellation.html">Cancellation</a></li><li class="chapter-item expanded "><a href="../../log_contexts.html">Log Contexts</a></li><li class="chapter-item expanded "><a href="../../replication.html">Replication</a></li><li class="chapter-item expanded "><a href="../../tcp_replication.html">TCP Replication</a></li></ol></li><li class="chapter-item expanded "><a href="../../development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../development/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="../../development/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><a href="../../development/room-dag-concepts.html">Room DAG concepts</a></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="../../media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="../../room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="../../deprecation_policy.html">Dependency Deprecation Policy</a></li><li class="chapter-item expanded "><a href="../../other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol>
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+                        <h1 id="logging-sample-configuration-file"><a class="header" href="#logging-sample-configuration-file">Logging Sample Configuration File</a></h1>
+<p>Below is a sample logging configuration file. This file can be tweaked to control how your
+homeserver will output logs. A restart of the server is generally required to apply any
+changes made to this file. The value of the <code>log_config</code> option in your homeserver
+config should be the path to this file.</p>
+<p>Note that a default logging configuration (shown below) is created automatically alongside
+the homeserver config when following the <a href="../../setup/installation.html">installation instructions</a>.
+It should be named <code>&lt;SERVERNAME&gt;.log.config</code> by default.</p>
+<pre><code class="language-yaml"># Log configuration for Synapse.
+#
+# This is a YAML file containing a standard Python logging configuration
+# dictionary. See [1] for details on the valid settings.
+#
+# Synapse also supports structured logging for machine readable logs which can
+# be ingested by ELK stacks. See [2] for details.
+#
+# [1]: https://docs.python.org/3.7/library/logging.config.html#configuration-dictionary-schema
+# [2]: https://matrix-org.github.io/synapse/latest/structured_logging.html
+
+version: 1
+
+formatters:
+    precise:
+        format: '%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s - %(message)s'
+
+handlers:
+    file:
+        class: logging.handlers.TimedRotatingFileHandler
+        formatter: precise
+        filename: /var/log/matrix-synapse/homeserver.log
+        when: midnight
+        backupCount: 3  # Does not include the current log file.
+        encoding: utf8
+
+    # Default to buffering writes to log file for efficiency.
+    # WARNING/ERROR logs will still be flushed immediately, but there will be a
+    # delay (of up to `period` seconds, or until the buffer is full with
+    # `capacity` messages) before INFO/DEBUG logs get written.
+    buffer:
+        class: synapse.logging.handlers.PeriodicallyFlushingMemoryHandler
+        target: file
+
+        # The capacity is the maximum number of log lines that are buffered
+        # before being written to disk. Increasing this will lead to better
+        # performance, at the expensive of it taking longer for log lines to
+        # be written to disk.
+        # This parameter is required.
+        capacity: 10
+
+        # Logs with a level at or above the flush level will cause the buffer to
+        # be flushed immediately.
+        # Default value: 40 (ERROR)
+        # Other values: 50 (CRITICAL), 30 (WARNING), 20 (INFO), 10 (DEBUG)
+        flushLevel: 30  # Flush immediately for WARNING logs and higher
+
+        # The period of time, in seconds, between forced flushes.
+        # Messages will not be delayed for longer than this time.
+        # Default value: 5 seconds
+        period: 5
+
+    # A handler that writes logs to stderr. Unused by default, but can be used
+    # instead of &quot;buffer&quot; and &quot;file&quot; in the logger handlers.
+    console:
+        class: logging.StreamHandler
+        formatter: precise
+
+loggers:
+    synapse.storage.SQL:
+        # beware: increasing this to DEBUG will make synapse log sensitive
+        # information such as access tokens.
+        level: INFO
+
+root:
+    level: INFO
+
+    # Write logs to the `buffer` handler, which will buffer them together in memory,
+    # then write them to a file.
+    #
+    # Replace &quot;buffer&quot; with &quot;console&quot; to log to stderr instead. (Note that you'll
+    # also need to update the configuration for the `twisted` logger above, in
+    # this case.)
+    #
+    handlers: [buffer]
+
+disable_existing_loggers: false
+</code></pre>
+
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diff --git a/v1.62/usage/configuration/user_authentication/index.html b/v1.62/usage/configuration/user_authentication/index.html
new file mode 100644
index 0000000000..5542912998
--- /dev/null
+++ b/v1.62/usage/configuration/user_authentication/index.html
@@ -0,0 +1,202 @@
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+                        <h1 id="user-authentication"><a class="header" href="#user-authentication">User Authentication</a></h1>
+<p>Synapse supports multiple methods of authenticating users, either out-of-the-box or through custom pluggable
+authentication modules.</p>
+<p>Included in Synapse is support for authenticating users via:</p>
+<ul>
+<li>A username and password.</li>
+<li>An email address and password.</li>
+<li>Single Sign-On through the SAML, Open ID Connect or CAS protocols.</li>
+<li>JSON Web Tokens.</li>
+<li>An administrator's shared secret.</li>
+</ul>
+<p>Synapse can additionally be extended to support custom authentication schemes through optional &quot;password auth provider&quot;
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+                        <h1 id="refresh-tokens"><a class="header" href="#refresh-tokens">Refresh Tokens</a></h1>
+<p>Synapse supports refresh tokens since version 1.49 (some earlier versions had support for an earlier, experimental draft of <a href="https://github.com/matrix-org/matrix-doc/blob/main/proposals/2918-refreshtokens.md#msc2918-refresh-tokens">MSC2918</a> which is not compatible).</p>
+<h2 id="background-and-motivation"><a class="header" href="#background-and-motivation">Background and motivation</a></h2>
+<p>Synapse users' sessions are identified by <strong>access tokens</strong>; access tokens are
+issued to users on login. Each session gets a unique access token which identifies
+it; the access token must be kept secret as it grants access to the user's account.</p>
+<p>Traditionally, these access tokens were eternally valid (at least until the user
+explicitly chose to log out).</p>
+<p>In some cases, it may be desirable for these access tokens to expire so that the
+potential damage caused by leaking an access token is reduced.
+On the other hand, forcing a user to re-authenticate (log in again) often might
+be too much of an inconvenience.</p>
+<p><strong>Refresh tokens</strong> are a mechanism to avoid some of this inconvenience whilst
+still getting most of the benefits of short access token lifetimes.
+Refresh tokens are also a concept present in OAuth 2 — further reading is available
+<a href="https://datatracker.ietf.org/doc/html/rfc6749#section-1.5">here</a>.</p>
+<p>When refresh tokens are in use, both an access token and a refresh token will be
+issued to users on login. The access token will expire after a predetermined amount
+of time, but otherwise works in the same way as before. When the access token is
+close to expiring (or has expired), the user's client should present the homeserver
+(Synapse) with the refresh token.</p>
+<p>The homeserver will then generate a new access token and refresh token for the user
+and return them. The old refresh token is invalidated and can not be used again*.</p>
+<p>Finally, refresh tokens also make it possible for sessions to be logged out if they
+are inactive for too long, before the session naturally ends; see the configuration
+guide below.</p>
+<p>*To prevent issues if clients lose connection half-way through refreshing a token,
+the refresh token is only invalidated once the new access token has been used at
+least once. For all intents and purposes, the above simplification is sufficient.</p>
+<h2 id="caveats"><a class="header" href="#caveats">Caveats</a></h2>
+<p>There are some caveats:</p>
+<ul>
+<li>If a third party gets both your access token and refresh token, they will be able to
+continue to enjoy access to your session.
+<ul>
+<li>This is still an improvement because you (the user) will notice when <em>your</em>
+session expires and you're not able to use your refresh token.
+That would be a giveaway that someone else has compromised your session.
+You would be able to log in again and terminate that session.
+Previously (with long-lived access tokens), a third party that has your access
+token could go undetected for a very long time.</li>
+</ul>
+</li>
+<li>Clients need to implement support for refresh tokens in order for them to be a
+useful mechanism.
+<ul>
+<li>It is up to homeserver administrators if they want to issue long-lived access
+tokens to clients not implementing refresh tokens.
+<ul>
+<li>For compatibility, it is likely that they should, at least until client support
+is widespread.
+<ul>
+<li>Users with clients that support refresh tokens will still benefit from the
+added security; it's not possible to downgrade a session to using long-lived
+access tokens so this effectively gives users the choice.</li>
+</ul>
+</li>
+<li>In a closed environment where all users use known clients, this may not be
+an issue as the homeserver administrator can know if the clients have refresh
+token support. In that case, the non-refreshable access token lifetime
+may be set to a short duration so that a similar level of security is provided.</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<h2 id="configuration-guide"><a class="header" href="#configuration-guide">Configuration Guide</a></h2>
+<p>The following configuration options, in the <code>registration</code> section, are related:</p>
+<ul>
+<li><code>session_lifetime</code>: maximum length of a session, even if it's refreshed.
+In other words, the client must log in again after this time period.
+In most cases, this can be unset (infinite) or set to a long time (years or months).</li>
+<li><code>refreshable_access_token_lifetime</code>: lifetime of access tokens that are created
+by clients supporting refresh tokens.
+This should be short; a good value might be 5 minutes (<code>5m</code>).</li>
+<li><code>nonrefreshable_access_token_lifetime</code>: lifetime of access tokens that are created
+by clients which don't support refresh tokens.
+Make this short if you want to effectively force use of refresh tokens.
+Make this long if you don't want to inconvenience users of clients which don't
+support refresh tokens (by forcing them to frequently re-authenticate using
+login credentials).</li>
+<li><code>refresh_token_lifetime</code>: lifetime of refresh tokens.
+In other words, the client must refresh within this time period to maintain its session.
+Unless you want to log inactive sessions out, it is often fine to use a long
+value here or even leave it unset (infinite).
+Beware that making it too short will inconvenience clients that do not connect
+very often, including mobile clients and clients of infrequent users (by making
+it more difficult for them to refresh in time, which may force them to need to
+re-authenticate using login credentials).</li>
+</ul>
+<p><strong>Note:</strong> All four options above only apply when tokens are created (by logging in or refreshing).
+Changes to these settings do not apply retroactively.</p>
+<h3 id="using-refresh-token-expiry-to-log-out-inactive-sessions"><a class="header" href="#using-refresh-token-expiry-to-log-out-inactive-sessions">Using refresh token expiry to log out inactive sessions</a></h3>
+<p>If you'd like to force sessions to be logged out upon inactivity, you can enable
+refreshable access token expiry and refresh token expiry.</p>
+<p>This works because a client must refresh at least once within a period of
+<code>refresh_token_lifetime</code> in order to maintain valid credentials to access the
+account.</p>
+<p>(It's suggested that <code>refresh_token_lifetime</code> should be longer than
+<code>refreshable_access_token_lifetime</code> and this section assumes that to be the case
+for simplicity.)</p>
+<p>Note: this will only affect sessions using refresh tokens. You may wish to
+set a short <code>nonrefreshable_access_token_lifetime</code> to prevent this being bypassed
+by clients that do not support refresh tokens.</p>
+<h4 id="choosing-values-that-guarantee-permitting-some-inactivity"><a class="header" href="#choosing-values-that-guarantee-permitting-some-inactivity">Choosing values that guarantee permitting some inactivity</a></h4>
+<p>It may be desirable to permit some short periods of inactivity, for example to
+accommodate brief outages in client connectivity.</p>
+<p>The following model aims to provide guidance for choosing <code>refresh_token_lifetime</code>
+and <code>refreshable_access_token_lifetime</code> to satisfy requirements of the form:</p>
+<ol>
+<li>inactivity longer than <code>L</code> <strong>MUST</strong> cause the session to be logged out; and</li>
+<li>inactivity shorter than <code>S</code> <strong>MUST NOT</strong> cause the session to be logged out.</li>
+</ol>
+<p>This model makes the weakest assumption that all active clients will refresh as
+needed to maintain an active access token, but no sooner.
+<em>In reality, clients may refresh more often than this model assumes, but the
+above requirements will still hold.</em></p>
+<p>To satisfy the above model,</p>
+<ul>
+<li><code>refresh_token_lifetime</code> should be set to <code>L</code>; and</li>
+<li><code>refreshable_access_token_lifetime</code> should be set to <code>L - S</code>.</li>
+</ul>
+
+                    </main>
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diff --git a/v1.62/usage/configuration/user_authentication/single_sign_on/cas.html b/v1.62/usage/configuration/user_authentication/single_sign_on/cas.html
new file mode 100644
index 0000000000..80fa41b039
--- /dev/null
+++ b/v1.62/usage/configuration/user_authentication/single_sign_on/cas.html
@@ -0,0 +1,195 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
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+
+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div class="sidebar-scrollbox">
+                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="../../../../welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="../../../../setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="../../../../postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="../../../../reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="../../../../setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="../../../../turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="../../../../delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li 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+                        <h1 id="cas"><a class="header" href="#cas">CAS</a></h1>
+<p>Synapse supports authenticating users via the <a href="https://en.wikipedia.org/wiki/Central_Authentication_Service">Central Authentication
+Service protocol</a>
+(CAS) natively.</p>
+<p>Please see the <code>cas_config</code> and <code>sso</code> sections of the <a href="../../../configuration/homeserver_sample_config.html">Synapse configuration
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+        <script src="../../../../highlight.js" type="text/javascript" charset="utf-8"></script>
+        <script src="../../../../book.js" type="text/javascript" charset="utf-8"></script>
+
+        <!-- Custom JS scripts -->
+        <script type="text/javascript" src="../../../../docs/website_files/table-of-contents.js"></script>
+    </body>
+</html>
\ No newline at end of file
diff --git a/v1.62/usage/configuration/user_authentication/single_sign_on/index.html b/v1.62/usage/configuration/user_authentication/single_sign_on/index.html
new file mode 100644
index 0000000000..7070d529fe
--- /dev/null
+++ b/v1.62/usage/configuration/user_authentication/single_sign_on/index.html
@@ -0,0 +1,193 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>Single-Sign On - Synapse</title>
+        <!-- Custom HTML head -->
+        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
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+        <meta name="viewport" content="width=device-width, initial-scale=1">
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+        <link rel="shortcut icon" href="../../../../favicon.png">
+        <link rel="stylesheet" href="../../../../css/variables.css">
+        <link rel="stylesheet" href="../../../../css/general.css">
+        <link rel="stylesheet" href="../../../../css/chrome.css">
+        <link rel="stylesheet" href="../../../../css/print.css" media="print">
+        <!-- Fonts -->
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+        <link rel="stylesheet" href="../../../../tomorrow-night.css">
+        <link rel="stylesheet" href="../../../../ayu-highlight.css">
+
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+        <link rel="stylesheet" href="../../../../docs/website_files/remove-nav-buttons.css">
+        <link rel="stylesheet" href="../../../../docs/website_files/indent-section-headers.css">
+    </head>
+    <body>
+        <!-- Provide site root to javascript -->
+        <script type="text/javascript">
+            var path_to_root = "../../../../";
+            var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light";
+        </script>
+
+        <!-- Work around some values being stored in localStorage wrapped in quotes -->
+        <script type="text/javascript">
+            try {
+                var theme = localStorage.getItem('mdbook-theme');
+                var sidebar = localStorage.getItem('mdbook-sidebar');
+                if (theme.startsWith('"') && theme.endsWith('"')) {
+                    localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
+                }
+                if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
+                    localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
+                }
+            } catch (e) { }
+        </script>
+
+        <!-- Set the theme before any content is loaded, prevents flash -->
+        <script type="text/javascript">
+            var theme;
+            try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
+            if (theme === null || theme === undefined) { theme = default_theme; }
+            var html = document.querySelector('html');
+            html.classList.remove('no-js')
+            html.classList.remove('light')
+            html.classList.add(theme);
+            html.classList.add('js');
+        </script>
+
+        <!-- Hide / unhide sidebar before it is displayed -->
+        <script type="text/javascript">
+            var html = document.querySelector('html');
+            var sidebar = 'hidden';
+            if (document.body.clientWidth >= 1080) {
+                try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
+                sidebar = sidebar || 'visible';
+            }
+            html.classList.remove('sidebar-visible');
+            html.classList.add("sidebar-" + sidebar);
+        </script>
+
+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div class="sidebar-scrollbox">
+                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="../../../../welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="../../../../setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="../../../../postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="../../../../reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="../../../../setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="../../../../turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="../../../../delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li 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href="../../../../modules/background_update_controller_callbacks.html">Background update controller callbacks</a></li><li class="chapter-item expanded "><a href="../../../../modules/account_data_callbacks.html">Account data callbacks</a></li><li class="chapter-item expanded "><a href="../../../../modules/porting_legacy_module.html">Porting a legacy module to the new interface</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../../../../workers.html">Workers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../synctl_workers.html">Using synctl with Workers</a></li><li class="chapter-item expanded "><a href="../../../../systemd-with-workers/index.html">Systemd</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../../../../usage/administration/index.html">Administration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../usage/administration/admin_api/index.html">Admin 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href="../../../../development/synapse_architecture/cancellation.html">Cancellation</a></li><li class="chapter-item expanded "><a href="../../../../log_contexts.html">Log Contexts</a></li><li class="chapter-item expanded "><a href="../../../../replication.html">Replication</a></li><li class="chapter-item expanded "><a href="../../../../tcp_replication.html">TCP Replication</a></li></ol></li><li class="chapter-item expanded "><a href="../../../../development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../development/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="../../../../development/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><a href="../../../../development/room-dag-concepts.html">Room DAG concepts</a></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="../../../../media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="../../../../room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="../../../../deprecation_policy.html">Dependency Deprecation Policy</a></li><li class="chapter-item expanded "><a href="../../../../other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol>
+            </div>
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+                    Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
+                        link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
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+                        <!-- Page table of contents -->
+                        <div class="sidetoc">
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+                        </div>
+
+                        <h1 id="single-sign-on"><a class="header" href="#single-sign-on">Single Sign-On</a></h1>
+<p>Synapse supports single sign-on through the SAML, Open ID Connect or CAS protocols. 
+LDAP and other login methods are supported through first and third-party password
+auth provider modules.</p>
+
+                    </main>
+
+                    <nav class="nav-wrapper" aria-label="Page navigation">
+                        <!-- Mobile navigation buttons -->
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+
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+    </body>
+</html>
\ No newline at end of file
diff --git a/v1.62/usage/configuration/user_authentication/single_sign_on/saml.html b/v1.62/usage/configuration/user_authentication/single_sign_on/saml.html
new file mode 100644
index 0000000000..3910059180
--- /dev/null
+++ b/v1.62/usage/configuration/user_authentication/single_sign_on/saml.html
@@ -0,0 +1,195 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>SAML - Synapse</title>
+        <!-- Custom HTML head -->
+        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
+        <meta name="description" content="">
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <meta name="theme-color" content="#ffffff" />
+
+        <link rel="icon" href="../../../../favicon.svg">
+        <link rel="shortcut icon" href="../../../../favicon.png">
+        <link rel="stylesheet" href="../../../../css/variables.css">
+        <link rel="stylesheet" href="../../../../css/general.css">
+        <link rel="stylesheet" href="../../../../css/chrome.css">
+        <link rel="stylesheet" href="../../../../css/print.css" media="print">
+        <!-- Fonts -->
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+        <link rel="stylesheet" href="../../../../fonts/fonts.css">
+        <!-- Highlight.js Stylesheets -->
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+        <link rel="stylesheet" href="../../../../tomorrow-night.css">
+        <link rel="stylesheet" href="../../../../ayu-highlight.css">
+
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+        <link rel="stylesheet" href="../../../../docs/website_files/table-of-contents.css">
+        <link rel="stylesheet" href="../../../../docs/website_files/remove-nav-buttons.css">
+        <link rel="stylesheet" href="../../../../docs/website_files/indent-section-headers.css">
+    </head>
+    <body>
+        <!-- Provide site root to javascript -->
+        <script type="text/javascript">
+            var path_to_root = "../../../../";
+            var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light";
+        </script>
+
+        <!-- Work around some values being stored in localStorage wrapped in quotes -->
+        <script type="text/javascript">
+            try {
+                var theme = localStorage.getItem('mdbook-theme');
+                var sidebar = localStorage.getItem('mdbook-sidebar');
+                if (theme.startsWith('"') && theme.endsWith('"')) {
+                    localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
+                }
+                if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
+                    localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
+                }
+            } catch (e) { }
+        </script>
+
+        <!-- Set the theme before any content is loaded, prevents flash -->
+        <script type="text/javascript">
+            var theme;
+            try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
+            if (theme === null || theme === undefined) { theme = default_theme; }
+            var html = document.querySelector('html');
+            html.classList.remove('no-js')
+            html.classList.remove('light')
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+        <script type="text/javascript">
+            var html = document.querySelector('html');
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+            if (document.body.clientWidth >= 1080) {
+                try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
+                sidebar = sidebar || 'visible';
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+            html.classList.remove('sidebar-visible');
+            html.classList.add("sidebar-" + sidebar);
+        </script>
+
+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
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