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authorMatMaul <MatMaul@users.noreply.github.com>2023-06-13 09:26:14 +0000
committerMatMaul <MatMaul@users.noreply.github.com>2023-06-13 09:26:14 +0000
commit91732b671658e91728f5970392b86df8bec71523 (patch)
treee445504894b3db9951f4dae68e7ab288c67d28f3 /v1.86/upgrade.html
parentdeploy: ba97b39881e296f4775b8f6dd18edb98a3dc733f (diff)
downloadsynapse-91732b671658e91728f5970392b86df8bec71523.tar.xz
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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>Upgrading between Synapse Versions - Synapse</title>
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+            html.classList.remove('no-js')
+            html.classList.remove('light')
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+            html.classList.add('js');
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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">
+            <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><ol class="section"><li class="chapter-item expanded "><a href="setup/turn/coturn.html">coturn TURN server</a></li><li class="chapter-item expanded "><a href="setup/turn/eturnal.html">eturnal TURN server</a></li></ol></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" class="active">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="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/experimental_features.html">Experimental Features</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><ol class="section"><li class="chapter-item expanded "><a href="usage/administration/monitoring/reporting_homeserver_usage_statistics.html">Reporting Homeserver Usage Statistics</a></li></ol></li><li class="chapter-item expanded "><a href="usage/administration/monthly_active_users.html">Monthly Active Users</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/reviews.html">Reviewing Code</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><li class="chapter-item expanded "><a href="development/synapse_architecture/faster_joins.html">Faster remote joins</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="upgrading-synapse"><a class="header" href="#upgrading-synapse">Upgrading Synapse</a></h1>
+<p>Before upgrading check if any special steps are required to upgrade from
+the version you currently have installed to the current version of
+Synapse. The extra instructions that may be required are listed later in
+this document.</p>
+<ul>
+<li>
+<p>Check that your versions of Python and PostgreSQL are still
+supported.</p>
+<p>Synapse follows upstream lifecycles for <a href="https://endoflife.date/python">Python</a> and
+<a href="https://endoflife.date/postgresql">PostgreSQL</a>, and removes support for versions
+which are no longer maintained.</p>
+<p>The website <a href="https://endoflife.date">https://endoflife.date</a> also offers convenient
+summaries.</p>
+</li>
+<li>
+<p>If Synapse was installed using <a href="setup/installation.html#prebuilt-packages">prebuilt packages</a>,
+you will need to follow the normal process for upgrading those packages.</p>
+</li>
+<li>
+<p>If Synapse was installed using pip then upgrade to the latest
+version by running:</p>
+<pre><code class="language-bash">pip install --upgrade matrix-synapse
+</code></pre>
+</li>
+<li>
+<p>If Synapse was installed from source, then:</p>
+<ol>
+<li>
+<p>Obtain the latest version of the source code. Git users can run
+<code>git pull</code> to do this.</p>
+</li>
+<li>
+<p>If you're running Synapse in a virtualenv, make sure to activate it before
+upgrading. For example, if Synapse is installed in a virtualenv in <code>~/synapse/env</code> then
+run:</p>
+<pre><code class="language-bash">source ~/synapse/env/bin/activate
+pip install --upgrade .
+</code></pre>
+<p>Include any relevant extras between square brackets, e.g. <code>pip install --upgrade &quot;.[postgres,oidc]&quot;</code>.</p>
+</li>
+<li>
+<p>If you're using <code>poetry</code> to manage a Synapse installation, run:</p>
+<pre><code class="language-bash">poetry install
+</code></pre>
+<p>Include any relevant extras with <code>--extras</code>, e.g. <code>poetry install --extras postgres --extras oidc</code>.
+It's probably easiest to run <code>poetry install --extras all</code>.</p>
+</li>
+<li>
+<p>Restart Synapse:</p>
+<pre><code class="language-bash">synctl restart
+</code></pre>
+</li>
+</ol>
+</li>
+</ul>
+<p>To check whether your update was successful, you can check the running
+server version with:</p>
+<pre><code class="language-bash"># you may need to replace 'localhost:8008' if synapse is not configured
+# to listen on port 8008.
+
+curl http://localhost:8008/_synapse/admin/v1/server_version
+</code></pre>
+<h2 id="rolling-back-to-older-versions"><a class="header" href="#rolling-back-to-older-versions">Rolling back to older versions</a></h2>
+<p>Rolling back to previous releases can be difficult, due to database
+schema changes between releases. Where we have been able to test the
+rollback process, this will be noted below.</p>
+<p>In general, you will need to undo any changes made during the upgrade
+process, for example:</p>
+<ul>
+<li>
+<p>pip:</p>
+<pre><code class="language-bash">source env/bin/activate
+# replace `1.3.0` accordingly:
+pip install matrix-synapse==1.3.0
+</code></pre>
+</li>
+<li>
+<p>Debian:</p>
+<pre><code class="language-bash"># replace `1.3.0` and `stretch` accordingly:
+wget https://packages.matrix.org/debian/pool/main/m/matrix-synapse-py3/matrix-synapse-py3_1.3.0+stretch1_amd64.deb
+dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
+</code></pre>
+</li>
+</ul>
+<h1 id="upgrading-to-v1860"><a class="header" href="#upgrading-to-v1860">Upgrading to v1.86.0</a></h1>
+<h2 id="minimum-supported-rust-version"><a class="header" href="#minimum-supported-rust-version">Minimum supported Rust version</a></h2>
+<p>The minimum supported Rust version has been increased from v1.58.1 to v1.60.0.
+Users building from source will need to ensure their <code>rustc</code> version is up to
+date.</p>
+<h1 id="upgrading-to-v1850"><a class="header" href="#upgrading-to-v1850">Upgrading to v1.85.0</a></h1>
+<h2 id="application-service-registration-with-user-property-deprecation"><a class="header" href="#application-service-registration-with-user-property-deprecation">Application service registration with &quot;user&quot; property deprecation</a></h2>
+<p>Application services should ensure they call the <code>/register</code> endpoint with a
+<code>username</code> property. The legacy <code>user</code> property is considered deprecated and
+should no longer be included.</p>
+<p>A future version of Synapse (v1.88.0 or later) will remove support for legacy
+application service login.</p>
+<h1 id="upgrading-to-v1840"><a class="header" href="#upgrading-to-v1840">Upgrading to v1.84.0</a></h1>
+<h2 id="deprecation-of-worker_replication_-configuration-settings"><a class="header" href="#deprecation-of-worker_replication_-configuration-settings">Deprecation of <code>worker_replication_*</code> configuration settings</a></h2>
+<p>When using workers,</p>
+<ul>
+<li><code>worker_replication_host</code></li>
+<li><code>worker_replication_http_port</code></li>
+<li><code>worker_replication_http_tls</code></li>
+</ul>
+<p>should now be removed from individual worker YAML configurations and the main process should instead be added to the <code>instance_map</code>
+in the shared YAML configuration, using the name <code>main</code>.</p>
+<p>The old <code>worker_replication_*</code> settings are now considered deprecated and are expected to be removed in Synapse v1.88.0.</p>
+<h3 id="example-change"><a class="header" href="#example-change">Example change</a></h3>
+<h4 id="before"><a class="header" href="#before">Before:</a></h4>
+<p>Shared YAML</p>
+<pre><code class="language-yaml">instance_map:
+  generic_worker1:
+    host: localhost
+    port: 5678
+    tls: false
+</code></pre>
+<p>Worker YAML</p>
+<pre><code class="language-yaml">worker_app: synapse.app.generic_worker
+worker_name: generic_worker1
+
+worker_replication_host: localhost
+worker_replication_http_port: 3456
+worker_replication_http_tls: false
+
+worker_listeners:
+  - type: http
+    port: 1234
+    resources:
+      - names: [client, federation]
+  - type: http
+    port: 5678
+    resources:
+      - names: [replication]
+
+worker_log_config: /etc/matrix-synapse/generic-worker-log.yaml
+</code></pre>
+<h4 id="after"><a class="header" href="#after">After:</a></h4>
+<p>Shared YAML</p>
+<pre><code class="language-yaml">instance_map:
+  main:
+    host: localhost
+    port: 3456
+    tls: false
+  generic_worker1:
+    host: localhost
+    port: 5678
+    tls: false
+</code></pre>
+<p>Worker YAML</p>
+<pre><code class="language-yaml">worker_app: synapse.app.generic_worker
+worker_name: generic_worker1
+
+worker_listeners:
+  - type: http
+    port: 1234
+    resources:
+      - names: [client, federation]
+  - type: http
+    port: 5678
+    resources:
+      - names: [replication]
+
+worker_log_config: /etc/matrix-synapse/generic-worker-log.yaml
+
+</code></pre>
+<p>Notes: </p>
+<ul>
+<li><code>tls</code> is optional but mirrors the functionality of <code>worker_replication_http_tls</code></li>
+</ul>
+<h1 id="upgrading-to-v1810"><a class="header" href="#upgrading-to-v1810">Upgrading to v1.81.0</a></h1>
+<h2 id="application-service-path--authentication-deprecations"><a class="header" href="#application-service-path--authentication-deprecations">Application service path &amp; authentication deprecations</a></h2>
+<p>Synapse now attempts the versioned appservice paths before falling back to the
+<a href="https://spec.matrix.org/v1.6/application-service-api/#legacy-routes">legacy paths</a>.
+Usage of the legacy routes should be considered deprecated.</p>
+<p>Additionally, Synapse has supported sending the application service access token
+via <a href="https://spec.matrix.org/v1.6/application-service-api/#authorization">the <code>Authorization</code> header</a>
+since v1.70.0. For backwards compatibility it is <em>also</em> sent as the <code>access_token</code>
+query parameter. This is insecure and should be considered deprecated.</p>
+<p>A future version of Synapse (v1.88.0 or later) will remove support for legacy
+application service routes and query parameter authorization.</p>
+<h1 id="upgrading-to-v1800"><a class="header" href="#upgrading-to-v1800">Upgrading to v1.80.0</a></h1>
+<h2 id="reporting-events-error-code-change"><a class="header" href="#reporting-events-error-code-change">Reporting events error code change</a></h2>
+<p>Before this update, the
+<a href="https://spec.matrix.org/v1.6/client-server-api/#post_matrixclientv3roomsroomidreporteventid"><code>POST /_matrix/client/v3/rooms/{roomId}/report/{eventId}</code></a>
+endpoint would return a <code>403</code> if a user attempted to report an event that they did not have access to.
+This endpoint will now return a <code>404</code> in this case instead.</p>
+<p>Clients that implement event reporting should check that their error handling code will handle this
+change.</p>
+<h1 id="upgrading-to-v1790"><a class="header" href="#upgrading-to-v1790">Upgrading to v1.79.0</a></h1>
+<h2 id="the-on_threepid_bind-module-callback-method-has-been-deprecated"><a class="header" href="#the-on_threepid_bind-module-callback-method-has-been-deprecated">The <code>on_threepid_bind</code> module callback method has been deprecated</a></h2>
+<p>Synapse v1.79.0 deprecates the
+<a href="modules/third_party_rules_callbacks.html#on_threepid_bind"><code>on_threepid_bind</code></a>
+&quot;third-party rules&quot; Synapse module callback method in favour of a new module method,
+<a href="modules/third_party_rules_callbacks.html#on_add_user_third_party_identifier"><code>on_add_user_third_party_identifier</code></a>.
+<code>on_threepid_bind</code> will be removed in a future version of Synapse. You should check whether any Synapse
+modules in use in your deployment are making use of <code>on_threepid_bind</code>, and update them where possible.</p>
+<p>The arguments and functionality of the new method are the same.</p>
+<p>The justification behind the name change is that the old method's name, <code>on_threepid_bind</code>, was
+misleading. A user is considered to &quot;bind&quot; their third-party ID to their Matrix ID only if they
+do so via an <a href="https://spec.matrix.org/latest/identity-service-api/">identity server</a>
+(so that users on other homeservers may find them). But this method was not called in that case -
+it was only called when a user added a third-party identifier on the local homeserver.</p>
+<p>Module developers may also be interested in the related
+<a href="modules/third_party_rules_callbacks.html#on_remove_user_third_party_identifier"><code>on_remove_user_third_party_identifier</code></a>
+module callback method that was also added in Synapse v1.79.0. This new method is called when a
+user removes a third-party identifier from their account.</p>
+<h1 id="upgrading-to-v1780"><a class="header" href="#upgrading-to-v1780">Upgrading to v1.78.0</a></h1>
+<h2 id="deprecate-the-_synapseadminv1mediaserver_namedelete-admin-api"><a class="header" href="#deprecate-the-_synapseadminv1mediaserver_namedelete-admin-api">Deprecate the <code>/_synapse/admin/v1/media/&lt;server_name&gt;/delete</code> admin API</a></h2>
+<p>Synapse 1.78.0 replaces the <code>/_synapse/admin/v1/media/&lt;server_name&gt;/delete</code>
+admin API with an identical endpoint at <code>/_synapse/admin/v1/media/delete</code>. Please
+update your tooling to use the new endpoint. The deprecated version will be removed
+in a future release.</p>
+<h1 id="upgrading-to-v1760"><a class="header" href="#upgrading-to-v1760">Upgrading to v1.76.0</a></h1>
+<h2 id="faster-joins-are-enabled-by-default"><a class="header" href="#faster-joins-are-enabled-by-default">Faster joins are enabled by default</a></h2>
+<p>When joining a room for the first time, Synapse 1.76.0 will request a partial join from the other server by default. Previously, server admins had to opt-in to this using an experimental config flag.</p>
+<p>Server admins can opt out of this feature for the time being by setting</p>
+<pre><code class="language-yaml">experimental:
+    faster_joins: false
+</code></pre>
+<p>in their server config.</p>
+<h2 id="changes-to-the-account-data-replication-streams"><a class="header" href="#changes-to-the-account-data-replication-streams">Changes to the account data replication streams</a></h2>
+<p>Synapse has changed the format of the account data and devices replication
+streams (between workers). This is a forwards- and backwards-incompatible
+change: v1.75 workers cannot process account data replicated by v1.76 workers,
+and vice versa.</p>
+<p>Once all workers are upgraded to v1.76 (or downgraded to v1.75), account data
+and device replication will resume as normal.</p>
+<h2 id="minimum-version-of-poetry-is-now-132"><a class="header" href="#minimum-version-of-poetry-is-now-132">Minimum version of Poetry is now 1.3.2</a></h2>
+<p>The minimum supported version of Poetry is now 1.3.2 (previously 1.2.0, <a href="#upgrading-to-v1670">since 
+Synapse 1.67</a>). If you have used <code>poetry install</code> to 
+install Synapse from a source checkout, you should upgrade poetry: see its
+<a href="https://python-poetry.org/docs/#installation">installation instructions</a>.
+For all other installation methods, no acction is required.</p>
+<h1 id="upgrading-to-v1740"><a class="header" href="#upgrading-to-v1740">Upgrading to v1.74.0</a></h1>
+<h2 id="unicode-support-in-user-search"><a class="header" href="#unicode-support-in-user-search">Unicode support in user search</a></h2>
+<p>This version introduces optional support for an <a href="https://github.com/matrix-org/synapse/pull/14464">improved user search dealing with Unicode characters</a>.</p>
+<p>If you want to take advantage of this feature you need to install PyICU,
+the ICU native dependency and its development headers
+so that PyICU can build since no prebuilt wheels are available.</p>
+<p>You can follow <a href="https://pypi.org/project/PyICU/">the PyICU documentation</a> to do so,
+and then do <code>pip install matrix-synapse[user-search]</code> for a PyPI install.</p>
+<p>Docker images and Debian packages need nothing specific as they already
+include or specify ICU as an explicit dependency.</p>
+<h2 id="user-directory-rebuild"><a class="header" href="#user-directory-rebuild">User directory rebuild</a></h2>
+<p>Synapse 1.74 queues a background update
+<a href="https://github.com/matrix-org/synapse/pull/14643">to rebuild the user directory</a>,
+in order to fix missing or erroneous entries.</p>
+<p>When this update begins, the user directory will be cleared out and rebuilt from
+scratch. User directory lookups will be incomplete until the rebuild completes.
+Admins can monitor the rebuild's progress by using the
+<a href="usage/administration/admin_api/background_updates.html#status">Background update Admin API</a>.</p>
+<h1 id="upgrading-to-v1730"><a class="header" href="#upgrading-to-v1730">Upgrading to v1.73.0</a></h1>
+<h2 id="legacy-prometheus-metric-names-have-now-been-removed"><a class="header" href="#legacy-prometheus-metric-names-have-now-been-removed">Legacy Prometheus metric names have now been removed</a></h2>
+<p>Synapse v1.69.0 included the deprecation of legacy Prometheus metric names
+and offered an option to disable them.
+Synapse v1.71.0 disabled legacy Prometheus metric names by default.</p>
+<p>This version, v1.73.0, removes those legacy Prometheus metric names entirely.
+This also means that the <code>enable_legacy_metrics</code> configuration option has been
+removed; it will no longer be possible to re-enable the legacy metric names.</p>
+<p>If you use metrics and have not yet updated your Grafana dashboard(s),
+Prometheus console(s) or alerting rule(s), please consider doing so when upgrading
+to this version.
+Note that the included Grafana dashboard was updated in v1.72.0 to correct some
+metric names which were missed when legacy metrics were disabled by default.</p>
+<p>See <a href="#deprecation-of-legacy-prometheus-metric-names">v1.69.0: Deprecation of legacy Prometheus metric names</a>
+for more context.</p>
+<h1 id="upgrading-to-v1720"><a class="header" href="#upgrading-to-v1720">Upgrading to v1.72.0</a></h1>
+<h2 id="dropping-support-for-postgresql-10"><a class="header" href="#dropping-support-for-postgresql-10">Dropping support for PostgreSQL 10</a></h2>
+<p>In line with our <a href="deprecation_policy.html">deprecation policy</a>, we've dropped
+support for PostgreSQL 10, as it is no longer supported upstream.</p>
+<p>This release of Synapse requires PostgreSQL 11+.</p>
+<h1 id="upgrading-to-v1710"><a class="header" href="#upgrading-to-v1710">Upgrading to v1.71.0</a></h1>
+<h2 id="removal-of-the-generate_short_term_login_token-module-api-method"><a class="header" href="#removal-of-the-generate_short_term_login_token-module-api-method">Removal of the <code>generate_short_term_login_token</code> module API method</a></h2>
+<p>As announced with the release of <a href="#deprecation-of-the-generate_short_term_login_token-module-api-method">Synapse 1.69.0</a>, the deprecated <code>generate_short_term_login_token</code> module method has been removed.</p>
+<p>Modules relying on it can instead use the <code>create_login_token</code> method.</p>
+<h2 id="changes-to-the-events-received-by-application-services-interest"><a class="header" href="#changes-to-the-events-received-by-application-services-interest">Changes to the events received by application services (interest)</a></h2>
+<p>To align with spec (changed in
+<a href="https://github.com/matrix-org/matrix-spec-proposals/pull/3905">MSC3905</a>), Synapse now
+only considers local users to be interesting. In other words, the <code>users</code> namespace
+regex is only be applied against local users of the homeserver.</p>
+<p>Please note, this probably doesn't affect the expected behavior of your application
+service, since an interesting local user in a room still means all messages in the room
+(from local or remote users) will still be considered interesting. And matching a room
+with the <code>rooms</code> or <code>aliases</code> namespace regex will still consider all events sent in the
+room to be interesting to the application service.</p>
+<p>If one of your application service's <code>users</code> regex was intending to match a remote user,
+this will no longer match as you expect. The behavioral mismatch between matching all
+local users and some remote users is why the spec was changed/clarified and this
+caveat is no longer supported.</p>
+<h2 id="legacy-prometheus-metric-names-are-now-disabled-by-default"><a class="header" href="#legacy-prometheus-metric-names-are-now-disabled-by-default">Legacy Prometheus metric names are now disabled by default</a></h2>
+<p>Synapse v1.71.0 disables legacy Prometheus metric names by default.
+For administrators that still rely on them and have not yet had chance to update their
+uses of the metrics, it's still possible to specify <code>enable_legacy_metrics: true</code> in
+the configuration to re-enable them temporarily.</p>
+<p>Synapse v1.73.0 will <strong>remove legacy metric names altogether</strong> and at that point,
+it will no longer be possible to re-enable them.</p>
+<p>If you do not use metrics or you have already updated your Grafana dashboard(s),
+Prometheus console(s) and alerting rule(s), there is no action needed.</p>
+<p>See <a href="#deprecation-of-legacy-prometheus-metric-names">v1.69.0: Deprecation of legacy Prometheus metric names</a>.</p>
+<h1 id="upgrading-to-v1690"><a class="header" href="#upgrading-to-v1690">Upgrading to v1.69.0</a></h1>
+<h2 id="changes-to-the-receipts-replication-streams"><a class="header" href="#changes-to-the-receipts-replication-streams">Changes to the receipts replication streams</a></h2>
+<p>Synapse now includes information indicating if a receipt applies to a thread when
+replicating it to other workers. This is a forwards- and backwards-incompatible
+change: v1.68 and workers cannot process receipts replicated by v1.69 workers, and
+vice versa.</p>
+<p>Once all workers are upgraded to v1.69 (or downgraded to v1.68), receipts
+replication will resume as normal.</p>
+<h2 id="deprecation-of-legacy-prometheus-metric-names"><a class="header" href="#deprecation-of-legacy-prometheus-metric-names">Deprecation of legacy Prometheus metric names</a></h2>
+<p>In current versions of Synapse, some Prometheus metrics are emitted under two different names,
+with one of the names being older but non-compliant with OpenMetrics and Prometheus conventions
+and one of the names being newer but compliant.</p>
+<p>Synapse v1.71.0 will turn the old metric names off <em>by default</em>.
+For administrators that still rely on them and have not had chance to update their
+uses of the metrics, it's possible to specify <code>enable_legacy_metrics: true</code> in
+the configuration to re-enable them temporarily.</p>
+<p>Synapse v1.73.0 will <strong>remove legacy metric names altogether</strong> and it will no longer
+be possible to re-enable them.</p>
+<p>The Grafana dashboard, Prometheus recording rules and Prometheus Consoles included
+in the <code>contrib</code> directory in the Synapse repository have been updated to no longer
+rely on the legacy names. These can be used on a current version of Synapse
+because current versions of Synapse emit both old and new names.</p>
+<p>You may need to update your alerting rules or any other rules that depend on
+the names of Prometheus metrics.
+If you want to test your changes before legacy names are disabled by default,
+you may specify <code>enable_legacy_metrics: false</code> in your homeserver configuration.</p>
+<p>A list of affected metrics is available on the <a href="https://matrix-org.github.io/synapse/v1.69/metrics-howto.html?highlight=metrics%20deprecated#renaming-of-metrics--deprecation-of-old-names-in-12">Metrics How-to page</a>.</p>
+<h2 id="deprecation-of-the-generate_short_term_login_token-module-api-method"><a class="header" href="#deprecation-of-the-generate_short_term_login_token-module-api-method">Deprecation of the <code>generate_short_term_login_token</code> module API method</a></h2>
+<p>The following method of the module API has been deprecated, and is scheduled to
+be remove in v1.71.0:</p>
+<pre><code class="language-python">def generate_short_term_login_token(
+    self,
+    user_id: str,
+    duration_in_ms: int = (2 * 60 * 1000),
+    auth_provider_id: str = &quot;&quot;,
+    auth_provider_session_id: Optional[str] = None,
+) -&gt; str:
+    ...
+</code></pre>
+<p>It has been replaced by an asynchronous equivalent:</p>
+<pre><code class="language-python">async def create_login_token(
+    self,
+    user_id: str,
+    duration_in_ms: int = (2 * 60 * 1000),
+    auth_provider_id: Optional[str] = None,
+    auth_provider_session_id: Optional[str] = None,
+) -&gt; str:
+    ...
+</code></pre>
+<p>Synapse will log a warning when a module uses the deprecated method, to help
+administrators find modules using it.</p>
+<h1 id="upgrading-to-v1680"><a class="header" href="#upgrading-to-v1680">Upgrading to v1.68.0</a></h1>
+<p>Two changes announced in the upgrade notes for v1.67.0 have now landed in v1.68.0.</p>
+<h2 id="sqlite-version-requirement"><a class="header" href="#sqlite-version-requirement">SQLite version requirement</a></h2>
+<p>Synapse now requires a SQLite version of 3.27.0 or higher if SQLite is configured as
+Synapse's database.</p>
+<p>Installations using</p>
+<ul>
+<li>Docker images <a href="https://hub.docker.com/r/matrixdotorg/synapse">from <code>matrixdotorg</code></a>,</li>
+<li>Debian packages <a href="https://packages.matrix.org/">from Matrix.org</a>, or</li>
+<li>a PostgreSQL database</li>
+</ul>
+<p>are not affected.</p>
+<h2 id="rust-requirement-when-building-from-source"><a class="header" href="#rust-requirement-when-building-from-source">Rust requirement when building from source.</a></h2>
+<p>Building from a source checkout of Synapse now requires a recent Rust compiler
+(currently Rust 1.58.1, but see also the
+<a href="https://matrix-org.github.io/synapse/latest/deprecation_policy.html">Platform Dependency Policy</a>).</p>
+<p>Installations using</p>
+<ul>
+<li>Docker images <a href="https://hub.docker.com/r/matrixdotorg/synapse">from <code>matrixdotorg</code></a>,</li>
+<li>Debian packages <a href="https://packages.matrix.org/">from Matrix.org</a>, or</li>
+<li>PyPI wheels via <code>pip install matrix-synapse</code> (on supported platforms and architectures)</li>
+</ul>
+<p>will not be affected.</p>
+<h1 id="upgrading-to-v1670"><a class="header" href="#upgrading-to-v1670">Upgrading to v1.67.0</a></h1>
+<h2 id="direct-tcp-replication-is-no-longer-supported-migrate-to-redis"><a class="header" href="#direct-tcp-replication-is-no-longer-supported-migrate-to-redis">Direct TCP replication is no longer supported: migrate to Redis</a></h2>
+<p>Redis support was added in v1.13.0 with it becoming the recommended method in
+v1.18.0. It replaced the old direct TCP connections (which was deprecated as of
+v1.18.0) to the main process. With Redis, rather than all the workers connecting
+to the main process, all the workers and the main process connect to Redis,
+which relays replication commands between processes. This can give a significant
+CPU saving on the main process and is a prerequisite for upcoming
+performance improvements.</p>
+<p>To migrate to Redis add the <a href="./workers.html#shared-configuration"><code>redis</code> config</a>,
+and remove the TCP <code>replication</code> listener from config of the master and
+<code>worker_replication_port</code> from worker config. Note that a HTTP listener with a
+<code>replication</code> resource is still required.</p>
+<h2 id="minimum-version-of-poetry-is-now-v120"><a class="header" href="#minimum-version-of-poetry-is-now-v120">Minimum version of Poetry is now v1.2.0</a></h2>
+<p>The minimum supported version of poetry is now 1.2. This should only affect
+those installing from a source checkout.</p>
+<h2 id="rust-requirement-in-the-next-release"><a class="header" href="#rust-requirement-in-the-next-release">Rust requirement in the next release</a></h2>
+<p>From the next major release (v1.68.0) installing Synapse from a source checkout
+will require a recent Rust compiler. Those using packages or
+<code>pip install matrix-synapse</code> will not be affected.</p>
+<p>The simplest way of installing Rust is via <a href="https://rustup.rs/">rustup.rs</a></p>
+<h2 id="sqlite-version-requirement-in-the-next-release"><a class="header" href="#sqlite-version-requirement-in-the-next-release">SQLite version requirement in the next release</a></h2>
+<p>From the next major release (v1.68.0) Synapse will require SQLite 3.27.0 or
+higher. Synapse v1.67.0 will be the last major release supporting SQLite
+versions 3.22 to 3.26.</p>
+<p>Those using Docker images or Debian packages from Matrix.org will not be
+affected. If you have installed from source, you should check the version of
+SQLite used by Python with:</p>
+<pre><code class="language-shell">python -c &quot;import sqlite3; print(sqlite3.sqlite_version)&quot;
+</code></pre>
+<p>If this is too old, refer to your distribution for advice on upgrading.</p>
+<h1 id="upgrading-to-v1660"><a class="header" href="#upgrading-to-v1660">Upgrading to v1.66.0</a></h1>
+<h2 id="delegation-of-email-validation-no-longer-supported"><a class="header" href="#delegation-of-email-validation-no-longer-supported">Delegation of email validation no longer supported</a></h2>
+<p>As of this version, Synapse no longer allows the tasks of verifying email address
+ownership, and password reset confirmation, to be delegated to an identity server.
+This removal was previously planned for Synapse 1.64.0, but was
+<a href="https://github.com/matrix-org/synapse/issues/13421">delayed</a> until now to give
+homeserver administrators more notice of the change.</p>
+<p>To continue to allow users to add email addresses to their homeserver accounts,
+and perform password resets, make sure that Synapse is configured with a working
+email server in the <a href="https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#email"><code>email</code> configuration
+section</a>
+(including, at a minimum, a <code>notif_from</code> setting.)</p>
+<p>Specifying an <code>email</code> setting under <code>account_threepid_delegates</code> will now cause
+an error at startup.</p>
+<h1 id="upgrading-to-v1640"><a class="header" href="#upgrading-to-v1640">Upgrading to v1.64.0</a></h1>
+<h2 id="deprecation-of-the-ability-to-delegate-e-mail-verification-to-identity-servers"><a class="header" href="#deprecation-of-the-ability-to-delegate-e-mail-verification-to-identity-servers">Deprecation of the ability to delegate e-mail verification to identity servers</a></h2>
+<p>Synapse v1.66.0 will remove the ability to delegate the tasks of verifying email address ownership, and password reset confirmation, to an identity server.</p>
+<p>If you require your homeserver to verify e-mail addresses or to support password resets via e-mail, please configure your homeserver with SMTP access so that it can send e-mails on its own behalf.
+<a href="https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#email">Consult the configuration documentation for more information.</a></p>
+<p>The option that will be removed is <code>account_threepid_delegates.email</code>.</p>
+<h2 id="changes-to-the-event-replication-streams"><a class="header" href="#changes-to-the-event-replication-streams">Changes to the event replication streams</a></h2>
+<p>Synapse now includes a flag indicating if an event is an outlier when
+replicating it to other workers. This is a forwards- and backwards-incompatible
+change: v1.63 and workers cannot process events replicated by v1.64 workers, and
+vice versa.</p>
+<p>Once all workers are upgraded to v1.64 (or downgraded to v1.63), event
+replication will resume as normal.</p>
+<h2 id="frozendict-release"><a class="header" href="#frozendict-release">frozendict release</a></h2>
+<p><a href="https://github.com/Marco-Sulla/python-frozendict/releases/tag/v2.3.3">frozendict 2.3.3</a>
+has recently been released, which fixes a memory leak that occurs during <code>/sync</code>
+requests. We advise server administrators who installed Synapse via pip to upgrade
+frozendict with <code>pip install --upgrade frozendict</code>. The Docker image
+<code>matrixdotorg/synapse</code> and the Debian packages from <code>packages.matrix.org</code> already
+include the updated library.</p>
+<h1 id="upgrading-to-v1620"><a class="header" href="#upgrading-to-v1620">Upgrading to v1.62.0</a></h1>
+<h2 id="new-signatures-for-spam-checker-callbacks"><a class="header" href="#new-signatures-for-spam-checker-callbacks">New signatures for spam checker callbacks</a></h2>
+<p>As a followup to changes in v1.60.0, the following spam-checker callbacks have changed signature:</p>
+<ul>
+<li><code>user_may_join_room</code></li>
+<li><code>user_may_invite</code></li>
+<li><code>user_may_send_3pid_invite</code></li>
+<li><code>user_may_create_room</code></li>
+<li><code>user_may_create_room_alias</code></li>
+<li><code>user_may_publish_room</code></li>
+<li><code>check_media_file_for_spam</code></li>
+</ul>
+<p>For each of these methods, the previous callback signature has been deprecated.</p>
+<p>Whereas callbacks used to return <code>bool</code>, they should now return <code>Union[&quot;synapse.module_api.NOT_SPAM&quot;, &quot;synapse.module_api.errors.Codes&quot;]</code>.</p>
+<p>For instance, if your module implements <code>user_may_join_room</code> as follows:</p>
+<pre><code class="language-python">async def user_may_join_room(self, user_id: str, room_id: str, is_invited: bool)
+    if ...:
+        # Request is spam
+        return False
+    # Request is not spam
+    return True
+</code></pre>
+<p>you should rewrite it as follows:</p>
+<pre><code class="language-python">async def user_may_join_room(self, user_id: str, room_id: str, is_invited: bool)
+    if ...:
+        # Request is spam, mark it as forbidden (you may use some more precise error
+        # code if it is useful).
+        return synapse.module_api.errors.Codes.FORBIDDEN
+    # Request is not spam, mark it as such.
+    return synapse.module_api.NOT_SPAM
+</code></pre>
+<h1 id="upgrading-to-v1610"><a class="header" href="#upgrading-to-v1610">Upgrading to v1.61.0</a></h1>
+<h2 id="removal-of-deprecated-communitygroups"><a class="header" href="#removal-of-deprecated-communitygroups">Removal of deprecated community/groups</a></h2>
+<p>This release of Synapse will remove deprecated community/groups from codebase.</p>
+<h3 id="worker-endpoints"><a class="header" href="#worker-endpoints">Worker endpoints</a></h3>
+<p>For those who have deployed workers, following worker endpoints will no longer
+exist and they can be removed from the reverse proxy configuration:</p>
+<ul>
+<li><code>^/_matrix/federation/v1/get_groups_publicised$</code></li>
+<li><code>^/_matrix/client/(r0|v3|unstable)/joined_groups$</code></li>
+<li><code>^/_matrix/client/(r0|v3|unstable)/publicised_groups$</code></li>
+<li><code>^/_matrix/client/(r0|v3|unstable)/publicised_groups/</code></li>
+<li><code>^/_matrix/federation/v1/groups/</code></li>
+<li><code>^/_matrix/client/(r0|v3|unstable)/groups/</code></li>
+</ul>
+<h1 id="upgrading-to-v1600"><a class="header" href="#upgrading-to-v1600">Upgrading to v1.60.0</a></h1>
+<h2 id="adding-a-new-unique-index-to-state_group_edges-could-fail-if-your-database-is-corrupted"><a class="header" href="#adding-a-new-unique-index-to-state_group_edges-could-fail-if-your-database-is-corrupted">Adding a new unique index to <code>state_group_edges</code> could fail if your database is corrupted</a></h2>
+<p>This release of Synapse will add a unique index to the <code>state_group_edges</code> table, in order
+to prevent accidentally introducing duplicate information (for example, because a database
+backup was restored multiple times).</p>
+<p>Duplicate rows being present in this table could cause drastic performance problems; see
+<a href="https://github.com/matrix-org/synapse/issues/11779">issue 11779</a> for more details.</p>
+<p>If your Synapse database already has had duplicate rows introduced into this table,
+this could fail, with either of these errors:</p>
+<p><strong>On Postgres:</strong></p>
+<pre><code>synapse.storage.background_updates - 623 - INFO - background_updates-0 - Adding index state_group_edges_unique_idx to state_group_edges
+synapse.storage.background_updates - 282 - ERROR - background_updates-0 - Error doing update
+...
+psycopg2.errors.UniqueViolation: could not create unique index &quot;state_group_edges_unique_idx&quot;
+DETAIL:  Key (state_group, prev_state_group)=(2, 1) is duplicated.
+</code></pre>
+<p>(The numbers may be different.)</p>
+<p><strong>On SQLite:</strong></p>
+<pre><code>synapse.storage.background_updates - 623 - INFO - background_updates-0 - Adding index state_group_edges_unique_idx to state_group_edges
+synapse.storage.background_updates - 282 - ERROR - background_updates-0 - Error doing update
+...
+sqlite3.IntegrityError: UNIQUE constraint failed: state_group_edges.state_group, state_group_edges.prev_state_group
+</code></pre>
+<details>
+<summary><b>Expand this section for steps to resolve this problem</b></summary>
+<h3 id="on-postgres"><a class="header" href="#on-postgres">On Postgres</a></h3>
+<p>Connect to your database with <code>psql</code>.</p>
+<pre><code class="language-sql">BEGIN;
+DELETE FROM state_group_edges WHERE (ctid, state_group, prev_state_group) IN (
+  SELECT row_id, state_group, prev_state_group
+  FROM (
+    SELECT
+      ctid AS row_id,
+      MIN(ctid) OVER (PARTITION BY state_group, prev_state_group) AS min_row_id,
+      state_group,
+      prev_state_group
+    FROM state_group_edges
+  ) AS t1
+  WHERE row_id &lt;&gt; min_row_id
+);
+COMMIT;
+</code></pre>
+<h3 id="on-sqlite"><a class="header" href="#on-sqlite">On SQLite</a></h3>
+<p>At the command-line, use <code>sqlite3 path/to/your-homeserver-database.db</code>:</p>
+<pre><code class="language-sql">BEGIN;
+DELETE FROM state_group_edges WHERE (rowid, state_group, prev_state_group) IN (
+  SELECT row_id, state_group, prev_state_group
+  FROM (
+    SELECT
+      rowid AS row_id,
+      MIN(rowid) OVER (PARTITION BY state_group, prev_state_group) AS min_row_id,
+      state_group,
+      prev_state_group
+    FROM state_group_edges
+  )
+  WHERE row_id &lt;&gt; min_row_id
+);
+COMMIT;
+</code></pre>
+<h3 id="for-more-details"><a class="header" href="#for-more-details">For more details</a></h3>
+<p><a href="https://github.com/matrix-org/synapse/issues/11779#issuecomment-1131545970">This comment on issue 11779</a>
+has queries that can be used to check a database for this problem in advance.</p>
+</details>
+<h2 id="new-signature-for-the-spam-checker-callback-check_event_for_spam"><a class="header" href="#new-signature-for-the-spam-checker-callback-check_event_for_spam">New signature for the spam checker callback <code>check_event_for_spam</code></a></h2>
+<p>The previous signature has been deprecated.</p>
+<p>Whereas <code>check_event_for_spam</code> callbacks used to return <code>Union[str, bool]</code>, they should now return <code>Union[&quot;synapse.module_api.NOT_SPAM&quot;, &quot;synapse.module_api.errors.Codes&quot;]</code>.</p>
+<p>This is part of an ongoing refactoring of the SpamChecker API to make it less ambiguous and more powerful.</p>
+<p>If your module implements <code>check_event_for_spam</code> as follows:</p>
+<pre><code class="language-python">async def check_event_for_spam(event):
+    if ...:
+        # Event is spam
+        return True
+    # Event is not spam
+    return False
+</code></pre>
+<p>you should rewrite it as follows:</p>
+<pre><code class="language-python">async def check_event_for_spam(event):
+    if ...:
+        # Event is spam, mark it as forbidden (you may use some more precise error
+        # code if it is useful).
+        return synapse.module_api.errors.Codes.FORBIDDEN
+    # Event is not spam, mark it as such.
+    return synapse.module_api.NOT_SPAM
+</code></pre>
+<h1 id="upgrading-to-v1590"><a class="header" href="#upgrading-to-v1590">Upgrading to v1.59.0</a></h1>
+<h2 id="device-name-lookup-over-federation-has-been-disabled-by-default"><a class="header" href="#device-name-lookup-over-federation-has-been-disabled-by-default">Device name lookup over federation has been disabled by default</a></h2>
+<p>The names of user devices are no longer visible to users on other homeservers by default.
+Device IDs are unaffected, as these are necessary to facilitate end-to-end encryption.</p>
+<p>To re-enable this functionality, set the
+<a href="https://matrix-org.github.io/synapse/v1.59/usage/configuration/config_documentation.html#federation"><code>allow_device_name_lookup_over_federation</code></a>
+homeserver config option to <code>true</code>.</p>
+<h2 id="deprecation-of-the-synapseappappservice-and-synapseappuser_dir-worker-application-types"><a class="header" href="#deprecation-of-the-synapseappappservice-and-synapseappuser_dir-worker-application-types">Deprecation of the <code>synapse.app.appservice</code> and <code>synapse.app.user_dir</code> worker application types</a></h2>
+<p>The <code>synapse.app.appservice</code> worker application type allowed you to configure a
+single worker to use to notify application services of new events, as long
+as this functionality was disabled on the main process with <code>notify_appservices: False</code>.
+Further, the <code>synapse.app.user_dir</code> worker application type allowed you to configure
+a single worker to be responsible for updating the user directory, as long as this
+was disabled on the main process with <code>update_user_directory: False</code>.</p>
+<p>To unify Synapse's worker types, the <code>synapse.app.appservice</code> worker application
+type and the <code>notify_appservices</code> configuration option have been deprecated.
+The <code>synapse.app.user_dir</code> worker application type and <code>update_user_directory</code>
+configuration option have also been deprecated.</p>
+<p>To get the same functionality as was provided by the deprecated options, it's now recommended that the <code>synapse.app.generic_worker</code>
+worker application type is used and that the <code>notify_appservices_from_worker</code> and/or
+<code>update_user_directory_from_worker</code> options are set to the name of a worker.</p>
+<p>For the time being, the old options can be used alongside the new options to make
+it easier to transition between the two configurations, however please note that:</p>
+<ul>
+<li>the options must not contradict each other (otherwise Synapse won't start); and</li>
+<li>the <code>notify_appservices</code> and <code>update_user_directory</code> options will be removed in a future release of Synapse.</li>
+</ul>
+<p>Please see the <a href="workers.html#notifying-application-services"><em>Notifying Application Services</em></a> and
+<a href="workers.html#updating-the-user-directory"><em>Updating the User Directory</em></a> sections of the worker
+documentation for more information.</p>
+<h1 id="upgrading-to-v1580"><a class="header" href="#upgrading-to-v1580">Upgrading to v1.58.0</a></h1>
+<h2 id="groupscommunities-feature-has-been-disabled-by-default"><a class="header" href="#groupscommunities-feature-has-been-disabled-by-default">Groups/communities feature has been disabled by default</a></h2>
+<p>The non-standard groups/communities feature in Synapse has been disabled by default
+and will be removed in Synapse v1.61.0.</p>
+<h1 id="upgrading-to-v1570"><a class="header" href="#upgrading-to-v1570">Upgrading to v1.57.0</a></h1>
+<h2 id="changes-to-database-schema-for-application-services"><a class="header" href="#changes-to-database-schema-for-application-services">Changes to database schema for application services</a></h2>
+<p>Synapse v1.57.0 includes a <a href="https://github.com/matrix-org/synapse/pull/12209">change</a> to the
+way transaction IDs are managed for application services. If your deployment uses a dedicated
+worker for application service traffic, <strong>it must be stopped</strong> when the database is upgraded
+(which normally happens when the main process is upgraded), to ensure the change is made safely
+without any risk of reusing transaction IDs.</p>
+<p>Deployments which do not use separate worker processes can be upgraded as normal. Similarly,
+deployments where no application services are in use can be upgraded as normal.</p>
+<details>
+<summary><b>Recovering from an incorrect upgrade</b></summary>
+<p>If the database schema is upgraded <em>without</em> stopping the worker responsible
+for AS traffic, then the following error may be given when attempting to start
+a Synapse worker or master process:</p>
+<pre><code>**********************************************************************************
+ Error during initialisation:
+
+ Postgres sequence 'application_services_txn_id_seq' is inconsistent with associated
+ table 'application_services_txns'. This can happen if Synapse has been downgraded and
+ then upgraded again, or due to a bad migration.
+
+ To fix this error, shut down Synapse (including any and all workers)
+ and run the following SQL:
+
+     SELECT setval('application_services_txn_id_seq', (
+         SELECT GREATEST(MAX(txn_id), 0) FROM application_services_txns
+     ));
+
+ See docs/postgres.md for more information.
+
+ There may be more information in the logs.
+**********************************************************************************
+</code></pre>
+<p>This error may also be seen if Synapse is <em>downgraded</em> to an earlier version,
+and then upgraded again to v1.57.0 or later.</p>
+<p>In either case:</p>
+<ol>
+<li>Ensure that the worker responsible for AS traffic is stopped.</li>
+<li>Run the SQL command given in the error message via <code>psql</code>.</li>
+</ol>
+<p>Synapse should then start correctly.</p>
+</details>
+<h1 id="upgrading-to-v1560"><a class="header" href="#upgrading-to-v1560">Upgrading to v1.56.0</a></h1>
+<h2 id="open-registration-without-verification-is-now-disabled-by-default"><a class="header" href="#open-registration-without-verification-is-now-disabled-by-default">Open registration without verification is now disabled by default</a></h2>
+<p>Synapse will refuse to start if registration is enabled without email, captcha, or token-based verification unless the new config
+flag <code>enable_registration_without_verification</code> is set to &quot;true&quot;.</p>
+<h2 id="groupscommunities-feature-has-been-deprecated"><a class="header" href="#groupscommunities-feature-has-been-deprecated">Groups/communities feature has been deprecated</a></h2>
+<p>The non-standard groups/communities feature in Synapse has been deprecated and will
+be disabled by default in Synapse v1.58.0.</p>
+<p>You can test disabling it by adding the following to your homeserver configuration:</p>
+<pre><code class="language-yaml">experimental_features:
+  groups_enabled: false
+</code></pre>
+<h2 id="change-in-behaviour-for-postgresql-databases-with-unsafe-locale"><a class="header" href="#change-in-behaviour-for-postgresql-databases-with-unsafe-locale">Change in behaviour for PostgreSQL databases with unsafe locale</a></h2>
+<p>Synapse now refuses to start when using PostgreSQL with non-<code>C</code> values for <code>COLLATE</code> and
+<code>CTYPE</code> unless the config flag <code>allow_unsafe_locale</code>, found in the database section of
+the configuration file, is set to <code>true</code>. See the <a href="https://matrix-org.github.io/synapse/latest/postgres.html#fixing-incorrect-collate-or-ctype">PostgreSQL documentation</a>
+for more information and instructions on how to fix a database with incorrect values.</p>
+<h1 id="upgrading-to-v1550"><a class="header" href="#upgrading-to-v1550">Upgrading to v1.55.0</a></h1>
+<h2 id="synctl-script-has-been-moved"><a class="header" href="#synctl-script-has-been-moved"><code>synctl</code> script has been moved</a></h2>
+<p>The <code>synctl</code> script
+<a href="https://github.com/matrix-org/synapse/pull/12140">has been made</a> an
+<a href="https://packaging.python.org/en/latest/specifications/entry-points/">entry point</a>
+and no longer exists at the root of Synapse's source tree. If you wish to use
+<code>synctl</code> to manage your homeserver, you should invoke <code>synctl</code> directly, e.g.
+<code>synctl start</code> instead of <code>./synctl start</code> or <code>/path/to/synctl start</code>.</p>
+<p>You will need to ensure <code>synctl</code> is on your <code>PATH</code>.</p>
+<ul>
+<li>This is automatically the case when using
+<a href="https://packages.matrix.org/debian/">Debian packages</a> or
+<a href="https://hub.docker.com/r/matrixdotorg/synapse">docker images</a>
+provided by Matrix.org.</li>
+<li>When installing from a wheel, sdist, or PyPI, a <code>synctl</code> executable is added
+to your Python installation's <code>bin</code>. This should be on your <code>PATH</code>
+automatically, though you might need to activate a virtual environment
+depending on how you installed Synapse.</li>
+</ul>
+<h2 id="compatibility-dropped-for-mjolnir-131-and-earlier"><a class="header" href="#compatibility-dropped-for-mjolnir-131-and-earlier">Compatibility dropped for Mjolnir 1.3.1 and earlier</a></h2>
+<p>Synapse v1.55.0 drops support for Mjolnir 1.3.1 and earlier.
+If you use the Mjolnir module to moderate your homeserver,
+please upgrade Mjolnir to version 1.3.2 or later before upgrading Synapse.</p>
+<h1 id="upgrading-to-v1540"><a class="header" href="#upgrading-to-v1540">Upgrading to v1.54.0</a></h1>
+<h2 id="legacy-structured-logging-configuration-removal"><a class="header" href="#legacy-structured-logging-configuration-removal">Legacy structured logging configuration removal</a></h2>
+<p>This release removes support for the <code>structured: true</code> logging configuration
+which was deprecated in Synapse v1.23.0. If your logging configuration contains
+<code>structured: true</code> then it should be modified based on the
+<a href="https://matrix-org.github.io/synapse/v1.56/structured_logging.html#upgrading-from-legacy-structured-logging-configuration">structured logging documentation</a>.</p>
+<h1 id="upgrading-to-v1530"><a class="header" href="#upgrading-to-v1530">Upgrading to v1.53.0</a></h1>
+<h2 id="dropping-support-for-webclient-listeners-and-non-https-web_client_location"><a class="header" href="#dropping-support-for-webclient-listeners-and-non-https-web_client_location">Dropping support for <code>webclient</code> listeners and non-HTTP(S) <code>web_client_location</code></a></h2>
+<p>Per the deprecation notice in Synapse v1.51.0, listeners of type  <code>webclient</code>
+are no longer supported and configuring them is a now a configuration error.</p>
+<p>Configuring a non-HTTP(S) <code>web_client_location</code> configuration is is now a
+configuration error. Since the <code>webclient</code> listener is no longer supported, this
+setting only applies to the root path <code>/</code> of Synapse's web server and no longer
+the <code>/_matrix/client/</code> path.</p>
+<h2 id="stablisation-of-msc3231"><a class="header" href="#stablisation-of-msc3231">Stablisation of MSC3231</a></h2>
+<p>The unstable validity-check endpoint for the
+<a href="https://spec.matrix.org/v1.2/client-server-api/#get_matrixclientv1registermloginregistration_tokenvalidity">Registration Tokens</a>
+feature has been stabilised and moved from:</p>
+<p><code>/_matrix/client/unstable/org.matrix.msc3231/register/org.matrix.msc3231.login.registration_token/validity</code></p>
+<p>to:</p>
+<p><code>/_matrix/client/v1/register/m.login.registration_token/validity</code></p>
+<p>Please update any relevant reverse proxy or firewall configurations appropriately.</p>
+<h2 id="time-based-cache-expiry-is-now-enabled-by-default"><a class="header" href="#time-based-cache-expiry-is-now-enabled-by-default">Time-based cache expiry is now enabled by default</a></h2>
+<p>Formerly, entries in the cache were not evicted regardless of whether they were accessed after storing.
+This behavior has now changed. By default entries in the cache are now evicted after 30m of not being accessed.
+To change the default behavior, go to the <code>caches</code> section of the config and change the <code>expire_caches</code> and
+<code>cache_entry_ttl</code> flags as necessary. Please note that these flags replace the <code>expiry_time</code> flag in the config.
+The <code>expiry_time</code> flag will still continue to work, but it has been deprecated and will be removed in the future.</p>
+<h2 id="deprecation-of-capability-orgmatrixmsc3283"><a class="header" href="#deprecation-of-capability-orgmatrixmsc3283">Deprecation of <code>capability</code> <code>org.matrix.msc3283.*</code></a></h2>
+<p>The <code>capabilities</code> of MSC3283 from the REST API <code>/_matrix/client/r0/capabilities</code>
+becomes stable.</p>
+<p>The old <code>capabilities</code></p>
+<ul>
+<li><code>org.matrix.msc3283.set_displayname</code>,</li>
+<li><code>org.matrix.msc3283.set_avatar_url</code> and</li>
+<li><code>org.matrix.msc3283.3pid_changes</code></li>
+</ul>
+<p>are deprecated and scheduled to be removed in Synapse v1.54.0.</p>
+<p>The new <code>capabilities</code></p>
+<ul>
+<li><code>m.set_displayname</code>,</li>
+<li><code>m.set_avatar_url</code> and</li>
+<li><code>m.3pid_changes</code></li>
+</ul>
+<p>are now active by default.</p>
+<h2 id="removal-of-user_may_create_room_with_invites"><a class="header" href="#removal-of-user_may_create_room_with_invites">Removal of <code>user_may_create_room_with_invites</code></a></h2>
+<p>As announced with the release of <a href="#deprecation-of-the-user_may_create_room_with_invites-module-callback">Synapse 1.47.0</a>,
+the deprecated <code>user_may_create_room_with_invites</code> module callback has been removed.</p>
+<p>Modules relying on it can instead implement <a href="https://matrix-org.github.io/synapse/latest/modules/spam_checker_callbacks.html#user_may_invite"><code>user_may_invite</code></a>
+and use the <a href="https://github.com/matrix-org/synapse/blob/872f23b95fa980a61b0866c1475e84491991fa20/synapse/module_api/__init__.py#L869-L876"><code>get_room_state</code></a>
+module API to infer whether the invite is happening while creating a room (see <a href="https://github.com/matrix-org/synapse-domain-rule-checker/blob/e7d092dd9f2a7f844928771dbfd9fd24c2332e48/synapse_domain_rule_checker/__init__.py#L56-L89">this function</a>
+as an example). Alternately, modules can also implement <a href="https://matrix-org.github.io/synapse/latest/modules/third_party_rules_callbacks.html#on_create_room"><code>on_create_room</code></a>.</p>
+<h1 id="upgrading-to-v1520"><a class="header" href="#upgrading-to-v1520">Upgrading to v1.52.0</a></h1>
+<h2 id="twisted-security-release"><a class="header" href="#twisted-security-release">Twisted security release</a></h2>
+<p>Note that <a href="https://github.com/twisted/twisted/releases/tag/twisted-22.1.0">Twisted 22.1.0</a>
+has recently been released, which fixes a <a href="https://github.com/twisted/twisted/security/advisories/GHSA-92x2-jw7w-xvvx">security issue</a>
+within the Twisted library. We do not believe Synapse is affected by this vulnerability,
+though we advise server administrators who installed Synapse via pip to upgrade Twisted
+with <code>pip install --upgrade Twisted treq</code> as a matter of good practice. The Docker image
+<code>matrixdotorg/synapse</code> and the Debian packages from <code>packages.matrix.org</code> are using the
+updated library.</p>
+<h1 id="upgrading-to-v1510"><a class="header" href="#upgrading-to-v1510">Upgrading to v1.51.0</a></h1>
+<h2 id="deprecation-of-webclient-listeners-and-non-https-web_client_location"><a class="header" href="#deprecation-of-webclient-listeners-and-non-https-web_client_location">Deprecation of <code>webclient</code> listeners and non-HTTP(S) <code>web_client_location</code></a></h2>
+<p>Listeners of type  <code>webclient</code> are deprecated and scheduled to be removed in
+Synapse v1.53.0.</p>
+<p>Similarly, a non-HTTP(S) <code>web_client_location</code> configuration is deprecated and
+will become a configuration error in Synapse v1.53.0.</p>
+<h1 id="upgrading-to-v1500"><a class="header" href="#upgrading-to-v1500">Upgrading to v1.50.0</a></h1>
+<h2 id="dropping-support-for-old-python-and-postgres-versions"><a class="header" href="#dropping-support-for-old-python-and-postgres-versions">Dropping support for old Python and Postgres versions</a></h2>
+<p>In line with our <a href="deprecation_policy.html">deprecation policy</a>,
+we've dropped support for Python 3.6 and PostgreSQL 9.6, as they are no
+longer supported upstream.</p>
+<p>This release of Synapse requires Python 3.7+ and PostgreSQL 10+.</p>
+<h1 id="upgrading-to-v1470"><a class="header" href="#upgrading-to-v1470">Upgrading to v1.47.0</a></h1>
+<h2 id="removal-of-old-room-admin-api"><a class="header" href="#removal-of-old-room-admin-api">Removal of old Room Admin API</a></h2>
+<p>The following admin APIs were deprecated in <a href="https://github.com/matrix-org/synapse/blob/v1.34.0/CHANGES.md#deprecations-and-removals">Synapse 1.34</a>
+(released on 2021-05-17) and have now been removed:</p>
+<ul>
+<li><code>POST /_synapse/admin/v1/&lt;room_id&gt;/delete</code></li>
+</ul>
+<p>Any scripts still using the above APIs should be converted to use the
+<a href="https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#delete-room-api">Delete Room API</a>.</p>
+<h2 id="deprecation-of-the-user_may_create_room_with_invites-module-callback"><a class="header" href="#deprecation-of-the-user_may_create_room_with_invites-module-callback">Deprecation of the <code>user_may_create_room_with_invites</code> module callback</a></h2>
+<p>The <code>user_may_create_room_with_invites</code> is deprecated and will be removed in a future
+version of Synapse. Modules implementing this callback can instead implement
+<a href="https://matrix-org.github.io/synapse/latest/modules/spam_checker_callbacks.html#user_may_invite"><code>user_may_invite</code></a>
+and use the <a href="https://github.com/matrix-org/synapse/blob/872f23b95fa980a61b0866c1475e84491991fa20/synapse/module_api/__init__.py#L869-L876"><code>get_room_state</code></a>
+module API method to infer whether the invite is happening in the context of creating a
+room.</p>
+<p>We plan to remove this callback in January 2022.</p>
+<h1 id="upgrading-to-v1450"><a class="header" href="#upgrading-to-v1450">Upgrading to v1.45.0</a></h1>
+<h2 id="changes-required-to-media-storage-provider-modules-when-reading-from-the-synapse-configuration-object"><a class="header" href="#changes-required-to-media-storage-provider-modules-when-reading-from-the-synapse-configuration-object">Changes required to media storage provider modules when reading from the Synapse configuration object</a></h2>
+<p>Media storage provider modules that read from the Synapse configuration object (i.e. that
+read the value of <code>hs.config.[...]</code>) now need to specify the configuration section they're
+reading from. This means that if a module reads the value of e.g. <code>hs.config.media_store_path</code>,
+it needs to replace it with <code>hs.config.media.media_store_path</code>.</p>
+<h1 id="upgrading-to-v1440"><a class="header" href="#upgrading-to-v1440">Upgrading to v1.44.0</a></h1>
+<h2 id="the-url-preview-cache-is-no-longer-mirrored-to-storage-providers"><a class="header" href="#the-url-preview-cache-is-no-longer-mirrored-to-storage-providers">The URL preview cache is no longer mirrored to storage providers</a></h2>
+<p>The <code>url_cache/</code> and <code>url_cache_thumbnails/</code> directories in the media store are
+no longer mirrored to storage providers. These two directories can be safely
+deleted from any configured storage providers to reclaim space.</p>
+<h1 id="upgrading-to-v1430"><a class="header" href="#upgrading-to-v1430">Upgrading to v1.43.0</a></h1>
+<h2 id="the-spaces-summary-apis-can-now-be-handled-by-workers"><a class="header" href="#the-spaces-summary-apis-can-now-be-handled-by-workers">The spaces summary APIs can now be handled by workers</a></h2>
+<p>The <a href="https://matrix-org.github.io/synapse/latest/workers.html#available-worker-applications">available worker applications documentation</a>
+has been updated to reflect that calls to the <code>/spaces</code>, <code>/hierarchy</code>, and
+<code>/summary</code> endpoints can now be routed to workers for both client API and
+federation requests.</p>
+<h1 id="upgrading-to-v1420"><a class="header" href="#upgrading-to-v1420">Upgrading to v1.42.0</a></h1>
+<h2 id="removal-of-old-room-admin-api-1"><a class="header" href="#removal-of-old-room-admin-api-1">Removal of old Room Admin API</a></h2>
+<p>The following admin APIs were deprecated in <a href="https://github.com/matrix-org/synapse/blob/v1.25.0/CHANGES.md#removal-warning">Synapse 1.25</a>
+(released on 2021-01-13) and have now been removed:</p>
+<ul>
+<li><code>POST /_synapse/admin/v1/purge_room</code></li>
+<li><code>POST /_synapse/admin/v1/shutdown_room/&lt;room_id&gt;</code></li>
+</ul>
+<p>Any scripts still using the above APIs should be converted to use the
+<a href="https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#delete-room-api">Delete Room API</a>.</p>
+<h2 id="user-interactive-authentication-fallback-templates-can-now-display-errors"><a class="header" href="#user-interactive-authentication-fallback-templates-can-now-display-errors">User-interactive authentication fallback templates can now display errors</a></h2>
+<p>This may affect you if you make use of custom HTML templates for the
+<a href="https://github.com/matrix-org/synapse/tree/develop/synapse/res/templates/recaptcha.html">reCAPTCHA (<code>synapse/res/templates/recaptcha.html</code>)</a> or
+<a href="https://github.com/matrix-org/synapse/tree/develop/synapse/res/templates/terms.html">terms (<code>synapse/res/templates/terms.html</code>)</a> fallback pages.</p>
+<p>The template is now provided an <code>error</code> variable if the authentication
+process failed. See the default templates linked above for an example.</p>
+<h2 id="removal-of-out-of-date-email-pushers"><a class="header" href="#removal-of-out-of-date-email-pushers">Removal of out-of-date email pushers</a></h2>
+<p>Users will stop receiving message updates via email for addresses that were
+once, but not still, linked to their account.</p>
+<h1 id="upgrading-to-v1410"><a class="header" href="#upgrading-to-v1410">Upgrading to v1.41.0</a></h1>
+<h2 id="add-support-for-routing-outbound-http-requests-via-a-proxy-for-federation"><a class="header" href="#add-support-for-routing-outbound-http-requests-via-a-proxy-for-federation">Add support for routing outbound HTTP requests via a proxy for federation</a></h2>
+<p>Since Synapse 1.6.0 (2019-11-26) you can set a proxy for outbound HTTP requests via
+http_proxy/https_proxy environment variables. This proxy was set for:</p>
+<ul>
+<li>push</li>
+<li>url previews</li>
+<li>phone-home stats</li>
+<li>recaptcha validation</li>
+<li>CAS auth validation</li>
+<li>OpenID Connect</li>
+<li>Federation (checking public key revocation)</li>
+</ul>
+<p>In this version we have added support for outbound requests for:</p>
+<ul>
+<li>Outbound federation</li>
+<li>Downloading remote media</li>
+<li>Fetching public keys of other servers</li>
+</ul>
+<p>These requests use the same proxy configuration. If you have a proxy configuration we
+recommend to verify the configuration. It may be necessary to adjust the <code>no_proxy</code>
+environment variable.</p>
+<p>See <a href="setup/forward_proxy.html">using a forward proxy with Synapse documentation</a> for
+details.</p>
+<h2 id="deprecation-of-template_dir"><a class="header" href="#deprecation-of-template_dir">Deprecation of <code>template_dir</code></a></h2>
+<p>The <code>template_dir</code> settings in the <code>sso</code>, <code>account_validity</code> and <code>email</code> sections of the
+configuration file are now deprecated. Server admins should use the new
+<code>templates.custom_template_directory</code> setting in the configuration file and use one single
+custom template directory for all aforementioned features. Template file names remain
+unchanged. See <a href="https://matrix-org.github.io/synapse/latest/templates.html">the related documentation</a>
+for more information and examples.</p>
+<p>We plan to remove support for these settings in October 2021.</p>
+<h2 id="_synapseadminv1usersuseridmedia-must-be-handled-by-media-workers"><a class="header" href="#_synapseadminv1usersuseridmedia-must-be-handled-by-media-workers"><code>/_synapse/admin/v1/users/{userId}/media</code> must be handled by media workers</a></h2>
+<p>The <a href="https://matrix-org.github.io/synapse/latest/workers.html#synapseappmedia_repository">media repository worker documentation</a>
+has been updated to reflect that calls to <code>/_synapse/admin/v1/users/{userId}/media</code>
+must now be handled by media repository workers. This is due to the new <code>DELETE</code> method
+of this endpoint modifying the media store.</p>
+<h1 id="upgrading-to-v1390"><a class="header" href="#upgrading-to-v1390">Upgrading to v1.39.0</a></h1>
+<h2 id="deprecation-of-the-current-third-party-rules-module-interface"><a class="header" href="#deprecation-of-the-current-third-party-rules-module-interface">Deprecation of the current third-party rules module interface</a></h2>
+<p>The current third-party rules module interface is deprecated in favour of the new generic
+modules system introduced in Synapse v1.37.0. Authors of third-party rules modules can refer
+to <a href="modules/porting_legacy_module.html">this documentation</a>
+to update their modules. Synapse administrators can refer to <a href="modules/index.html">this documentation</a>
+to update their configuration once the modules they are using have been updated.</p>
+<p>We plan to remove support for the current third-party rules interface in September 2021.</p>
+<h1 id="upgrading-to-v1380"><a class="header" href="#upgrading-to-v1380">Upgrading to v1.38.0</a></h1>
+<h2 id="re-indexing-of-events-table-on-postgres-databases"><a class="header" href="#re-indexing-of-events-table-on-postgres-databases">Re-indexing of <code>events</code> table on Postgres databases</a></h2>
+<p>This release includes a database schema update which requires re-indexing one of
+the larger tables in the database, <code>events</code>. This could result in increased
+disk I/O for several hours or days after upgrading while the migration
+completes. Furthermore, because we have to keep the old indexes until the new
+indexes are ready, it could result in a significant, temporary, increase in
+disk space.</p>
+<p>To get a rough idea of the disk space required, check the current size of one
+of the indexes. For example, from a <code>psql</code> shell, run the following sql:</p>
+<pre><code class="language-sql">SELECT pg_size_pretty(pg_relation_size('events_order_room'));
+</code></pre>
+<p>We need to rebuild <strong>four</strong> indexes, so you will need to multiply this result
+by four to give an estimate of the disk space required. For example, on one
+particular server:</p>
+<pre><code>synapse=# select pg_size_pretty(pg_relation_size('events_order_room'));
+ pg_size_pretty
+----------------
+ 288 MB
+(1 row)
+</code></pre>
+<p>On this server, it would be wise to ensure that at least 1152MB are free.</p>
+<p>The additional disk space will be freed once the migration completes.</p>
+<p>SQLite databases are unaffected by this change.</p>
+<h1 id="upgrading-to-v1370"><a class="header" href="#upgrading-to-v1370">Upgrading to v1.37.0</a></h1>
+<h2 id="deprecation-of-the-current-spam-checker-interface"><a class="header" href="#deprecation-of-the-current-spam-checker-interface">Deprecation of the current spam checker interface</a></h2>
+<p>The current spam checker interface is deprecated in favour of a new generic modules system.
+Authors of spam checker modules can refer to [this
+documentation](modules/porting_legacy_module.md
+to update their modules. Synapse administrators can refer to <a href="modules/index.html">this
+documentation</a>
+to update their configuration once the modules they are using have been updated.</p>
+<p>We plan to remove support for the current spam checker interface in August 2021.</p>
+<p>More module interfaces will be ported over to this new generic system in future versions
+of Synapse.</p>
+<h1 id="upgrading-to-v1340"><a class="header" href="#upgrading-to-v1340">Upgrading to v1.34.0</a></h1>
+<h2 id="room_invite_state_types-configuration-setting"><a class="header" href="#room_invite_state_types-configuration-setting"><code>room_invite_state_types</code> configuration setting</a></h2>
+<p>The <code>room_invite_state_types</code> configuration setting has been deprecated
+and replaced with <code>room_prejoin_state</code>. See the <a href="https://github.com/matrix-org/synapse/blob/v1.34.0/docs/sample_config.yaml#L1515">sample configuration
+file</a>.</p>
+<p>If you have set <code>room_invite_state_types</code> to the default value you
+should simply remove it from your configuration file. The default value
+used to be:</p>
+<pre><code class="language-yaml">room_invite_state_types:
+   - &quot;m.room.join_rules&quot;
+   - &quot;m.room.canonical_alias&quot;
+   - &quot;m.room.avatar&quot;
+   - &quot;m.room.encryption&quot;
+   - &quot;m.room.name&quot;
+</code></pre>
+<p>If you have customised this value, you should remove
+<code>room_invite_state_types</code> and configure <code>room_prejoin_state</code> instead.</p>
+<h1 id="upgrading-to-v1330"><a class="header" href="#upgrading-to-v1330">Upgrading to v1.33.0</a></h1>
+<h2 id="account-validity-html-templates-can-now-display-a-users-expiration-date"><a class="header" href="#account-validity-html-templates-can-now-display-a-users-expiration-date">Account Validity HTML templates can now display a user's expiration date</a></h2>
+<p>This may affect you if you have enabled the account validity feature,
+and have made use of a custom HTML template specified by the
+<code>account_validity.template_dir</code> or
+<code>account_validity.account_renewed_html_path</code> Synapse config options.</p>
+<p>The template can now accept an <code>expiration_ts</code> variable, which
+represents the unix timestamp in milliseconds for the future date of
+which their account has been renewed until. See the <a href="https://github.com/matrix-org/synapse/blob/release-v1.33.0/synapse/res/templates/account_renewed.html">default
+template</a>
+for an example of usage.</p>
+<p>ALso note that a new HTML template, <code>account_previously_renewed.html</code>,
+has been added. This is is shown to users when they attempt to renew
+their account with a valid renewal token that has already been used
+before. The default template contents can been found
+<a href="https://github.com/matrix-org/synapse/blob/release-v1.33.0/synapse/res/templates/account_previously_renewed.html">here</a>,
+and can also accept an <code>expiration_ts</code> variable. This template replaces
+the error message users would previously see upon attempting to use a
+valid renewal token more than once.</p>
+<h1 id="upgrading-to-v1320"><a class="header" href="#upgrading-to-v1320">Upgrading to v1.32.0</a></h1>
+<h2 id="regression-causing-connected-prometheus-instances-to-become-overwhelmed"><a class="header" href="#regression-causing-connected-prometheus-instances-to-become-overwhelmed">Regression causing connected Prometheus instances to become overwhelmed</a></h2>
+<p>This release introduces <a href="https://github.com/matrix-org/synapse/issues/9853">a
+regression</a> that can
+overwhelm connected Prometheus instances. This issue is not present in
+Synapse v1.32.0rc1.</p>
+<p>If you have been affected, please downgrade to 1.31.0. You then may need
+to remove excess writeahead logs in order for Prometheus to recover.
+Instructions for doing so are provided
+<a href="https://github.com/matrix-org/synapse/pull/9854#issuecomment-823472183">here</a>.</p>
+<h2 id="dropping-support-for-old-python-postgres-and-sqlite-versions"><a class="header" href="#dropping-support-for-old-python-postgres-and-sqlite-versions">Dropping support for old Python, Postgres and SQLite versions</a></h2>
+<p>In line with our <a href="deprecation_policy.html">deprecation policy</a>,
+we've dropped support for Python 3.5 and PostgreSQL 9.5, as they are no
+longer supported upstream.</p>
+<p>This release of Synapse requires Python 3.6+ and PostgresSQL 9.6+ or
+SQLite 3.22+.</p>
+<h2 id="removal-of-old-list-accounts-admin-api"><a class="header" href="#removal-of-old-list-accounts-admin-api">Removal of old List Accounts Admin API</a></h2>
+<p>The deprecated v1 &quot;list accounts&quot; admin API
+(<code>GET /_synapse/admin/v1/users/&lt;user_id&gt;</code>) has been removed in this
+version.</p>
+<p>The <a href="admin_api/user_admin_api.html#list-accounts">v2 list accounts API</a>
+has been available since Synapse 1.7.0 (2019-12-13), and is accessible
+under <code>GET /_synapse/admin/v2/users</code>.</p>
+<p>The deprecation of the old endpoint was announced with Synapse 1.28.0
+(released on 2021-02-25).</p>
+<h2 id="application-services-must-use-type-mloginapplication_service-when-registering-users"><a class="header" href="#application-services-must-use-type-mloginapplication_service-when-registering-users">Application Services must use type <code>m.login.application_service</code> when registering users</a></h2>
+<p>In compliance with the <a href="https://matrix.org/docs/spec/application_service/r0.1.2#server-admin-style-permissions">Application Service
+spec</a>,
+Application Services are now required to use the
+<code>m.login.application_service</code> type when registering users via the
+<code>/_matrix/client/r0/register</code> endpoint. This behaviour was deprecated in
+Synapse v1.30.0.</p>
+<p>Please ensure your Application Services are up to date.</p>
+<h1 id="upgrading-to-v1290"><a class="header" href="#upgrading-to-v1290">Upgrading to v1.29.0</a></h1>
+<h2 id="requirement-for-x-forwarded-proto-header"><a class="header" href="#requirement-for-x-forwarded-proto-header">Requirement for X-Forwarded-Proto header</a></h2>
+<p>When using Synapse with a reverse proxy (in particular, when using the
+<code>x_forwarded</code> option on an HTTP listener), Synapse now
+expects to receive an <code>X-Forwarded-Proto</code> header on incoming
+HTTP requests. If it is not set, Synapse will log a warning on each
+received request.</p>
+<p>To avoid the warning, administrators using a reverse proxy should ensure
+that the reverse proxy sets <code>X-Forwarded-Proto</code> header to
+<code>https</code> or <code>http</code> to indicate the protocol used
+by the client.</p>
+<p>Synapse also requires the <code>Host</code> header to be preserved.</p>
+<p>See the <a href="reverse_proxy.html">reverse proxy documentation</a>, where the
+example configurations have been updated to show how to set these
+headers.</p>
+<p>(Users of <a href="https://caddyserver.com/">Caddy</a> are unaffected, since we
+believe it sets <code>X-Forwarded-Proto</code> by default.)</p>
+<h1 id="upgrading-to-v1270"><a class="header" href="#upgrading-to-v1270">Upgrading to v1.27.0</a></h1>
+<h2 id="changes-to-callback-uri-for-oauth2--openid-connect-and-saml2"><a class="header" href="#changes-to-callback-uri-for-oauth2--openid-connect-and-saml2">Changes to callback URI for OAuth2 / OpenID Connect and SAML2</a></h2>
+<p>This version changes the URI used for callbacks from OAuth2 and SAML2
+identity providers:</p>
+<ul>
+<li>
+<p>If your server is configured for single sign-on via an OpenID
+Connect or OAuth2 identity provider, you will need to add
+<code>[synapse public baseurl]/_synapse/client/oidc/callback</code> to the list
+of permitted &quot;redirect URIs&quot; at the identity provider.</p>
+<p>See the <a href="openid.html">OpenID docs</a> for more information on setting
+up OpenID Connect.</p>
+</li>
+<li>
+<p>If your server is configured for single sign-on via a SAML2 identity
+provider, you will need to add
+<code>[synapse public baseurl]/_synapse/client/saml2/authn_response</code> as a
+permitted &quot;ACS location&quot; (also known as &quot;allowed callback URLs&quot;)
+at the identity provider.</p>
+<p>The &quot;Issuer&quot; in the &quot;AuthnRequest&quot; to the SAML2 identity
+provider is also updated to
+<code>[synapse public baseurl]/_synapse/client/saml2/metadata.xml</code>. If
+your SAML2 identity provider uses this property to validate or
+otherwise identify Synapse, its configuration will need to be
+updated to use the new URL. Alternatively you could create a new,
+separate &quot;EntityDescriptor&quot; in your SAML2 identity provider with
+the new URLs and leave the URLs in the existing &quot;EntityDescriptor&quot;
+as they were.</p>
+</li>
+</ul>
+<h2 id="changes-to-html-templates"><a class="header" href="#changes-to-html-templates">Changes to HTML templates</a></h2>
+<p>The HTML templates for SSO and email notifications now have <a href="https://jinja.palletsprojects.com/en/2.11.x/api/#autoescaping">Jinja2's
+autoescape</a>
+enabled for files ending in <code>.html</code>, <code>.htm</code>, and <code>.xml</code>. If you have
+customised these templates and see issues when viewing them you might
+need to update them. It is expected that most configurations will need
+no changes.</p>
+<p>If you have customised the templates <em>names</em> for these templates, it is
+recommended to verify they end in <code>.html</code> to ensure autoescape is
+enabled.</p>
+<p>The above applies to the following templates:</p>
+<ul>
+<li><code>add_threepid.html</code></li>
+<li><code>add_threepid_failure.html</code></li>
+<li><code>add_threepid_success.html</code></li>
+<li><code>notice_expiry.html</code></li>
+<li><code>notice_expiry.html</code></li>
+<li><code>notif_mail.html</code> (which, by default, includes <code>room.html</code> and
+<code>notif.html</code>)</li>
+<li><code>password_reset.html</code></li>
+<li><code>password_reset_confirmation.html</code></li>
+<li><code>password_reset_failure.html</code></li>
+<li><code>password_reset_success.html</code></li>
+<li><code>registration.html</code></li>
+<li><code>registration_failure.html</code></li>
+<li><code>registration_success.html</code></li>
+<li><code>sso_account_deactivated.html</code></li>
+<li><code>sso_auth_bad_user.html</code></li>
+<li><code>sso_auth_confirm.html</code></li>
+<li><code>sso_auth_success.html</code></li>
+<li><code>sso_error.html</code></li>
+<li><code>sso_login_idp_picker.html</code></li>
+<li><code>sso_redirect_confirm.html</code></li>
+</ul>
+<h1 id="upgrading-to-v1260"><a class="header" href="#upgrading-to-v1260">Upgrading to v1.26.0</a></h1>
+<h2 id="rolling-back-to-v1250-after-a-failed-upgrade"><a class="header" href="#rolling-back-to-v1250-after-a-failed-upgrade">Rolling back to v1.25.0 after a failed upgrade</a></h2>
+<p>v1.26.0 includes a lot of large changes. If something problematic
+occurs, you may want to roll-back to a previous version of Synapse.
+Because v1.26.0 also includes a new database schema version, reverting
+that version is also required alongside the generic rollback
+instructions mentioned above. In short, to roll back to v1.25.0 you need
+to:</p>
+<ol>
+<li>
+<p>Stop the server</p>
+</li>
+<li>
+<p>Decrease the schema version in the database:</p>
+<pre><code class="language-sql">UPDATE schema_version SET version = 58;
+</code></pre>
+</li>
+<li>
+<p>Delete the ignored users &amp; chain cover data:</p>
+<pre><code class="language-sql">DROP TABLE IF EXISTS ignored_users;
+UPDATE rooms SET has_auth_chain_index = false;
+</code></pre>
+<p>For PostgreSQL run:</p>
+<pre><code class="language-sql">TRUNCATE event_auth_chain_links;
+TRUNCATE event_auth_chains;
+</code></pre>
+<p>For SQLite run:</p>
+<pre><code class="language-sql">DELETE FROM event_auth_chain_links;
+DELETE FROM event_auth_chains;
+</code></pre>
+</li>
+<li>
+<p>Mark the deltas as not run (so they will re-run on upgrade).</p>
+<pre><code class="language-sql">DELETE FROM applied_schema_deltas WHERE version = 59 AND file = &quot;59/01ignored_user.py&quot;;
+DELETE FROM applied_schema_deltas WHERE version = 59 AND file = &quot;59/06chain_cover_index.sql&quot;;
+</code></pre>
+</li>
+<li>
+<p>Downgrade Synapse by following the instructions for your
+installation method in the &quot;Rolling back to older versions&quot;
+section above.</p>
+</li>
+</ol>
+<h1 id="upgrading-to-v1250"><a class="header" href="#upgrading-to-v1250">Upgrading to v1.25.0</a></h1>
+<h2 id="last-release-supporting-python-35"><a class="header" href="#last-release-supporting-python-35">Last release supporting Python 3.5</a></h2>
+<p>This is the last release of Synapse which guarantees support with Python
+3.5, which passed its upstream End of Life date several months ago.</p>
+<p>We will attempt to maintain support through March 2021, but without
+guarantees.</p>
+<p>In the future, Synapse will follow upstream schedules for ending support
+of older versions of Python and PostgreSQL. Please upgrade to at least
+Python 3.6 and PostgreSQL 9.6 as soon as possible.</p>
+<h2 id="blacklisting-ip-ranges"><a class="header" href="#blacklisting-ip-ranges">Blacklisting IP ranges</a></h2>
+<p>Synapse v1.25.0 includes new settings, <code>ip_range_blacklist</code> and
+<code>ip_range_whitelist</code>, for controlling outgoing requests from Synapse for
+federation, identity servers, push, and for checking key validity for
+third-party invite events. The previous setting,
+<code>federation_ip_range_blacklist</code>, is deprecated. The new
+<code>ip_range_blacklist</code> defaults to private IP ranges if it is not defined.</p>
+<p>If you have never customised <code>federation_ip_range_blacklist</code> it is
+recommended that you remove that setting.</p>
+<p>If you have customised <code>federation_ip_range_blacklist</code> you should update
+the setting name to <code>ip_range_blacklist</code>.</p>
+<p>If you have a custom push server that is reached via private IP space
+you may need to customise <code>ip_range_blacklist</code> or <code>ip_range_whitelist</code>.</p>
+<h1 id="upgrading-to-v1240"><a class="header" href="#upgrading-to-v1240">Upgrading to v1.24.0</a></h1>
+<h2 id="custom-openid-connect-mapping-provider-breaking-change"><a class="header" href="#custom-openid-connect-mapping-provider-breaking-change">Custom OpenID Connect mapping provider breaking change</a></h2>
+<p>This release allows the OpenID Connect mapping provider to perform
+normalisation of the localpart of the Matrix ID. This allows for the
+mapping provider to specify different algorithms, instead of the
+<a href="https://matrix.org/docs/spec/appendices#mapping-from-other-character-sets">default
+way</a>.</p>
+<p>If your Synapse configuration uses a custom mapping provider
+(<code>oidc_config.user_mapping_provider.module</code> is specified and
+not equal to
+<code>synapse.handlers.oidc_handler.JinjaOidcMappingProvider</code>)
+then you <em>must</em> ensure that <code>map_user_attributes</code> of the
+mapping provider performs some normalisation of the
+<code>localpart</code> returned. To match previous behaviour you can
+use the <code>map_username_to_mxid_localpart</code> function provided
+by Synapse. An example is shown below:</p>
+<pre><code class="language-python">from synapse.types import map_username_to_mxid_localpart
+
+class MyMappingProvider:
+    def map_user_attributes(self, userinfo, token):
+        # ... your custom logic ...
+        sso_user_id = ...
+        localpart = map_username_to_mxid_localpart(sso_user_id)
+
+        return {&quot;localpart&quot;: localpart}
+</code></pre>
+<h2 id="removal-historical-synapse-admin-api"><a class="header" href="#removal-historical-synapse-admin-api">Removal historical Synapse Admin API</a></h2>
+<p>Historically, the Synapse Admin API has been accessible under:</p>
+<ul>
+<li><code>/_matrix/client/api/v1/admin</code></li>
+<li><code>/_matrix/client/unstable/admin</code></li>
+<li><code>/_matrix/client/r0/admin</code></li>
+<li><code>/_synapse/admin/v1</code></li>
+</ul>
+<p>The endpoints with <code>/_matrix/client/*</code> prefixes have been removed as of
+v1.24.0. The Admin API is now only accessible under:</p>
+<ul>
+<li><code>/_synapse/admin/v1</code></li>
+</ul>
+<p>The only exception is the <code>/admin/whois</code> endpoint, which is
+<a href="https://matrix.org/docs/spec/client_server/r0.6.1#get-matrix-client-r0-admin-whois-userid">also available via the client-server
+API</a>.</p>
+<p>The deprecation of the old endpoints was announced with Synapse 1.20.0
+(released on 2020-09-22) and makes it easier for homeserver admins to
+lock down external access to the Admin API endpoints.</p>
+<h1 id="upgrading-to-v1230"><a class="header" href="#upgrading-to-v1230">Upgrading to v1.23.0</a></h1>
+<h2 id="structured-logging-configuration-breaking-changes"><a class="header" href="#structured-logging-configuration-breaking-changes">Structured logging configuration breaking changes</a></h2>
+<p>This release deprecates use of the <code>structured: true</code> logging
+configuration for structured logging. If your logging configuration
+contains <code>structured: true</code> then it should be modified based on the
+<a href="https://matrix-org.github.io/synapse/v1.56/structured_logging.html#upgrading-from-legacy-structured-logging-configuration">structured logging documentation</a>.</p>
+<p>The <code>structured</code> and <code>drains</code> logging options are now deprecated and
+should be replaced by standard logging configuration of <code>handlers</code> and
+<code>formatters</code>.</p>
+<p>A future will release of Synapse will make using <code>structured: true</code> an
+error.</p>
+<h1 id="upgrading-to-v1220"><a class="header" href="#upgrading-to-v1220">Upgrading to v1.22.0</a></h1>
+<h2 id="thirdpartyeventrules-breaking-changes"><a class="header" href="#thirdpartyeventrules-breaking-changes">ThirdPartyEventRules breaking changes</a></h2>
+<p>This release introduces a backwards-incompatible change to modules
+making use of <code>ThirdPartyEventRules</code> in Synapse. If you make use of a
+module defined under the <code>third_party_event_rules</code> config option, please
+make sure it is updated to handle the below change:</p>
+<p>The <code>http_client</code> argument is no longer passed to modules as they are
+initialised. Instead, modules are expected to make use of the
+<code>http_client</code> property on the <code>ModuleApi</code> class. Modules are now passed
+a <code>module_api</code> argument during initialisation, which is an instance of
+<code>ModuleApi</code>. <code>ModuleApi</code> instances have a <code>http_client</code> property which
+acts the same as the <code>http_client</code> argument previously passed to
+<code>ThirdPartyEventRules</code> modules.</p>
+<h1 id="upgrading-to-v1210"><a class="header" href="#upgrading-to-v1210">Upgrading to v1.21.0</a></h1>
+<h2 id="forwarding-_synapseclient-through-your-reverse-proxy"><a class="header" href="#forwarding-_synapseclient-through-your-reverse-proxy">Forwarding <code>/_synapse/client</code> through your reverse proxy</a></h2>
+<p>The <a href="reverse_proxy.html">reverse proxy documentation</a>
+has been updated to include reverse proxy directives for
+<code>/_synapse/client/*</code> endpoints. As the user password reset flow now uses
+endpoints under this prefix, <strong>you must update your reverse proxy
+configurations for user password reset to work</strong>.</p>
+<p>Additionally, note that the <a href="workers.html">Synapse worker documentation</a> has been updated to</p>
+<p>:   state that the <code>/_synapse/client/password_reset/email/submit_token</code>
+endpoint can be handled</p>
+<p>by all workers. If you make use of Synapse's worker feature, please
+update your reverse proxy configuration to reflect this change.</p>
+<h2 id="new-html-templates"><a class="header" href="#new-html-templates">New HTML templates</a></h2>
+<p>A new HTML template,
+<a href="https://github.com/matrix-org/synapse/blob/develop/synapse/res/templates/password_reset_confirmation.html">password_reset_confirmation.html</a>,
+has been added to the <code>synapse/res/templates</code> directory. If you are
+using a custom template directory, you may want to copy the template
+over and modify it.</p>
+<p>Note that as of v1.20.0, templates do not need to be included in custom
+template directories for Synapse to start. The default templates will be
+used if a custom template cannot be found.</p>
+<p>This page will appear to the user after clicking a password reset link
+that has been emailed to them.</p>
+<p>To complete password reset, the page must include a way to make a
+<code>POST</code> request to
+<code>/_synapse/client/password_reset/{medium}/submit_token</code> with the query
+parameters from the original link, presented as a URL-encoded form. See
+the file itself for more details.</p>
+<h2 id="updated-single-sign-on-html-templates"><a class="header" href="#updated-single-sign-on-html-templates">Updated Single Sign-on HTML Templates</a></h2>
+<p>The <code>saml_error.html</code> template was removed from Synapse and replaced
+with the <code>sso_error.html</code> template. If your Synapse is configured to use
+SAML and a custom <code>sso_redirect_confirm_template_dir</code> configuration then
+any customisations of the <code>saml_error.html</code> template will need to be
+merged into the <code>sso_error.html</code> template. These templates are similar,
+but the parameters are slightly different:</p>
+<ul>
+<li>The <code>msg</code> parameter should be renamed to <code>error_description</code>.</li>
+<li>There is no longer a <code>code</code> parameter for the response code.</li>
+<li>A string <code>error</code> parameter is available that includes a short hint
+of why a user is seeing the error page.</li>
+</ul>
+<h1 id="upgrading-to-v1180"><a class="header" href="#upgrading-to-v1180">Upgrading to v1.18.0</a></h1>
+<h2 id="docker--py3-suffix-will-be-removed-in-future-versions"><a class="header" href="#docker--py3-suffix-will-be-removed-in-future-versions">Docker <code>-py3</code> suffix will be removed in future versions</a></h2>
+<p>From 10th August 2020, we will no longer publish Docker images with the
+<code>-py3</code> tag suffix. The images tagged with the
+<code>-py3</code> suffix have been identical to the non-suffixed tags
+since release 0.99.0, and the suffix is obsolete.</p>
+<p>On 10th August, we will remove the <code>latest-py3</code> tag.
+Existing per-release tags (such as <code>v1.18.0-py3</code> will not
+be removed, but no new <code>-py3</code> tags will be added.</p>
+<p>Scripts relying on the <code>-py3</code> suffix will need to be
+updated.</p>
+<h2 id="redis-replication-is-now-recommended-in-lieu-of-tcp-replication"><a class="header" href="#redis-replication-is-now-recommended-in-lieu-of-tcp-replication">Redis replication is now recommended in lieu of TCP replication</a></h2>
+<p>When setting up worker processes, we now recommend the use of a Redis
+server for replication. <strong>The old direct TCP connection method is
+deprecated and will be removed in a future release.</strong> See
+the <a href="https://matrix-org.github.io/synapse/v1.66/workers.html">worker documentation</a> for more details.</p>
+<h1 id="upgrading-to-v1140"><a class="header" href="#upgrading-to-v1140">Upgrading to v1.14.0</a></h1>
+<p>This version includes a database update which is run as part of the
+upgrade, and which may take a couple of minutes in the case of a large
+server. Synapse will not respond to HTTP requests while this update is
+taking place.</p>
+<h1 id="upgrading-to-v1130"><a class="header" href="#upgrading-to-v1130">Upgrading to v1.13.0</a></h1>
+<h2 id="incorrect-database-migration-in-old-synapse-versions"><a class="header" href="#incorrect-database-migration-in-old-synapse-versions">Incorrect database migration in old synapse versions</a></h2>
+<p>A bug was introduced in Synapse 1.4.0 which could cause the room
+directory to be incomplete or empty if Synapse was upgraded directly
+from v1.2.1 or earlier, to versions between v1.4.0 and v1.12.x.</p>
+<p>This will <em>not</em> be a problem for Synapse installations which were:</p>
+<p>:   -   created at v1.4.0 or later,
+-   upgraded via v1.3.x, or
+-   upgraded straight from v1.2.1 or earlier to v1.13.0 or later.</p>
+<p>If completeness of the room directory is a concern, installations which
+are affected can be repaired as follows:</p>
+<ol>
+<li>
+<p>Run the following sql from a <code>psql</code> or
+<code>sqlite3</code> console:</p>
+<pre><code class="language-sql">INSERT INTO background_updates (update_name, progress_json, depends_on) VALUES
+   ('populate_stats_process_rooms', '{}', 'current_state_events_membership');
+
+INSERT INTO background_updates (update_name, progress_json, depends_on) VALUES
+   ('populate_stats_process_users', '{}', 'populate_stats_process_rooms');
+</code></pre>
+</li>
+<li>
+<p>Restart synapse.</p>
+</li>
+</ol>
+<h2 id="new-single-sign-on-html-templates"><a class="header" href="#new-single-sign-on-html-templates">New Single Sign-on HTML Templates</a></h2>
+<p>New templates (<code>sso_auth_confirm.html</code>, <code>sso_auth_success.html</code>, and
+<code>sso_account_deactivated.html</code>) were added to Synapse. If your Synapse
+is configured to use SSO and a custom
+<code>sso_redirect_confirm_template_dir</code> configuration then these templates
+will need to be copied from
+<a href="https://github.com/matrix-org/synapse/tree/develop/synapse/res/templates"><code>synapse/res/templates</code></a> into that directory.</p>
+<h2 id="synapse-sso-plugins-method-deprecation"><a class="header" href="#synapse-sso-plugins-method-deprecation">Synapse SSO Plugins Method Deprecation</a></h2>
+<p>Plugins using the <code>complete_sso_login</code> method of
+<code>synapse.module_api.ModuleApi</code> should update to using the async/await
+version <code>complete_sso_login_async</code> which includes additional checks. The
+non-async version is considered deprecated.</p>
+<h2 id="rolling-back-to-v1124-after-a-failed-upgrade"><a class="header" href="#rolling-back-to-v1124-after-a-failed-upgrade">Rolling back to v1.12.4 after a failed upgrade</a></h2>
+<p>v1.13.0 includes a lot of large changes. If something problematic
+occurs, you may want to roll-back to a previous version of Synapse.
+Because v1.13.0 also includes a new database schema version, reverting
+that version is also required alongside the generic rollback
+instructions mentioned above. In short, to roll back to v1.12.4 you need
+to:</p>
+<ol>
+<li>
+<p>Stop the server</p>
+</li>
+<li>
+<p>Decrease the schema version in the database:</p>
+<pre><code class="language-sql">UPDATE schema_version SET version = 57;
+</code></pre>
+</li>
+<li>
+<p>Downgrade Synapse by following the instructions for your
+installation method in the &quot;Rolling back to older versions&quot;
+section above.</p>
+</li>
+</ol>
+<h1 id="upgrading-to-v1120"><a class="header" href="#upgrading-to-v1120">Upgrading to v1.12.0</a></h1>
+<p>This version includes a database update which is run as part of the
+upgrade, and which may take some time (several hours in the case of a
+large server). Synapse will not respond to HTTP requests while this
+update is taking place.</p>
+<p>This is only likely to be a problem in the case of a server which is
+participating in many rooms.</p>
+<ol start="0">
+<li>
+<p>As with all upgrades, it is recommended that you have a recent
+backup of your database which can be used for recovery in the event
+of any problems.</p>
+</li>
+<li>
+<p>As an initial check to see if you will be affected, you can try
+running the following query from the <code>psql</code> or
+<code>sqlite3</code> console. It is safe to run it while Synapse is
+still running.</p>
+<pre><code class="language-sql">SELECT MAX(q.v) FROM (
+  SELECT (
+    SELECT ej.json AS v
+    FROM state_events se INNER JOIN event_json ej USING (event_id)
+    WHERE se.room_id=rooms.room_id AND se.type='m.room.create' AND se.state_key=''
+    LIMIT 1
+  ) FROM rooms WHERE rooms.room_version IS NULL
+) q;
+</code></pre>
+<p>This query will take about the same amount of time as the upgrade
+process: ie, if it takes 5 minutes, then it is likely that Synapse
+will be unresponsive for 5 minutes during the upgrade.</p>
+<p>If you consider an outage of this duration to be acceptable, no
+further action is necessary and you can simply start Synapse 1.12.0.</p>
+<p>If you would prefer to reduce the downtime, continue with the steps
+below.</p>
+</li>
+<li>
+<p>The easiest workaround for this issue is to manually create a new
+index before upgrading. On PostgreSQL, his can be done as follows:</p>
+<pre><code class="language-sql">CREATE INDEX CONCURRENTLY tmp_upgrade_1_12_0_index
+ON state_events(room_id) WHERE type = 'm.room.create';
+</code></pre>
+<p>The above query may take some time, but is also safe to run while
+Synapse is running.</p>
+<p>We assume that no SQLite users have databases large enough to be
+affected. If you <em>are</em> affected, you can run a similar query,
+omitting the <code>CONCURRENTLY</code> keyword. Note however that this
+operation may in itself cause Synapse to stop running for some time.
+Synapse admins are reminded that <a href="postgres.html">SQLite is not recommended for use
+outside a test environment</a>.</p>
+</li>
+<li>
+<p>Once the index has been created, the <code>SELECT</code> query in step 1 above
+should complete quickly. It is therefore safe to upgrade to Synapse
+1.12.0.</p>
+</li>
+<li>
+<p>Once Synapse 1.12.0 has successfully started and is responding to
+HTTP requests, the temporary index can be removed:</p>
+<pre><code class="language-sql">DROP INDEX tmp_upgrade_1_12_0_index;
+</code></pre>
+</li>
+</ol>
+<h1 id="upgrading-to-v1100"><a class="header" href="#upgrading-to-v1100">Upgrading to v1.10.0</a></h1>
+<p>Synapse will now log a warning on start up if used with a PostgreSQL
+database that has a non-recommended locale set.</p>
+<p>See <a href="postgres.html">Postgres</a> for details.</p>
+<h1 id="upgrading-to-v180"><a class="header" href="#upgrading-to-v180">Upgrading to v1.8.0</a></h1>
+<p>Specifying a <code>log_file</code> config option will now cause Synapse to refuse
+to start, and should be replaced by with the <code>log_config</code> option.
+Support for the <code>log_file</code> option was removed in v1.3.0 and has since
+had no effect.</p>
+<h1 id="upgrading-to-v170"><a class="header" href="#upgrading-to-v170">Upgrading to v1.7.0</a></h1>
+<p>In an attempt to configure Synapse in a privacy preserving way, the
+default behaviours of <code>allow_public_rooms_without_auth</code> and
+<code>allow_public_rooms_over_federation</code> have been inverted. This means that
+by default, only authenticated users querying the Client/Server API will
+be able to query the room directory, and relatedly that the server will
+not share room directory information with other servers over federation.</p>
+<p>If your installation does not explicitly set these settings one way or
+the other and you want either setting to be <code>true</code> then it will
+necessary to update your homeserver configuration file accordingly.</p>
+<p>For more details on the surrounding context see our
+<a href="https://matrix.org/blog/2019/11/09/avoiding-unwelcome-visitors-on-private-matrix-servers">explainer</a>.</p>
+<h1 id="upgrading-to-v150"><a class="header" href="#upgrading-to-v150">Upgrading to v1.5.0</a></h1>
+<p>This release includes a database migration which may take several
+minutes to complete if there are a large number (more than a million or
+so) of entries in the <code>devices</code> table. This is only likely to a be a
+problem on very large installations.</p>
+<h1 id="upgrading-to-v140"><a class="header" href="#upgrading-to-v140">Upgrading to v1.4.0</a></h1>
+<h2 id="new-custom-templates"><a class="header" href="#new-custom-templates">New custom templates</a></h2>
+<p>If you have configured a custom template directory with the
+<code>email.template_dir</code> option, be aware that there are new templates
+regarding registration and threepid management (see below) that must be
+included.</p>
+<ul>
+<li><code>registration.html</code> and <code>registration.txt</code></li>
+<li><code>registration_success.html</code> and <code>registration_failure.html</code></li>
+<li><code>add_threepid.html</code> and <code>add_threepid.txt</code></li>
+<li><code>add_threepid_failure.html</code> and <code>add_threepid_success.html</code></li>
+</ul>
+<p>Synapse will expect these files to exist inside the configured template
+directory, and <strong>will fail to start</strong> if they are absent. To view the
+default templates, see
+<a href="https://github.com/matrix-org/synapse/tree/master/synapse/res/templates">synapse/res/templates</a>.</p>
+<h2 id="3pid-verification-changes"><a class="header" href="#3pid-verification-changes">3pid verification changes</a></h2>
+<p><strong>Note: As of this release, users will be unable to add phone numbers or
+email addresses to their accounts, without changes to the Synapse
+configuration. This includes adding an email address during
+registration.</strong></p>
+<p>It is possible for a user to associate an email address or phone number
+with their account, for a number of reasons:</p>
+<ul>
+<li>for use when logging in, as an alternative to the user id.</li>
+<li>in the case of email, as an alternative contact to help with account
+recovery.</li>
+<li>in the case of email, to receive notifications of missed messages.</li>
+</ul>
+<p>Before an email address or phone number can be added to a user's
+account, or before such an address is used to carry out a
+password-reset, Synapse must confirm the operation with the owner of the
+email address or phone number. It does this by sending an email or text
+giving the user a link or token to confirm receipt. This process is
+known as '3pid verification'. ('3pid', or 'threepid', stands for
+third-party identifier, and we use it to refer to external identifiers
+such as email addresses and phone numbers.)</p>
+<p>Previous versions of Synapse delegated the task of 3pid verification to
+an identity server by default. In most cases this server is <code>vector.im</code>
+or <code>matrix.org</code>.</p>
+<p>In Synapse 1.4.0, for security and privacy reasons, the homeserver will
+no longer delegate this task to an identity server by default. Instead,
+the server administrator will need to explicitly decide how they would
+like the verification messages to be sent.</p>
+<p>In the medium term, the <code>vector.im</code> and <code>matrix.org</code> identity servers
+will disable support for delegated 3pid verification entirely. However,
+in order to ease the transition, they will retain the capability for a
+limited period. Delegated email verification will be disabled on Monday
+2nd December 2019 (giving roughly 2 months notice). Disabling delegated
+SMS verification will follow some time after that once SMS verification
+support lands in Synapse.</p>
+<p>Once delegated 3pid verification support has been disabled in the
+<code>vector.im</code> and <code>matrix.org</code> identity servers, all Synapse versions that
+depend on those instances will be unable to verify email and phone
+numbers through them. There are no imminent plans to remove delegated
+3pid verification from Sydent generally. (Sydent is the identity server
+project that backs the <code>vector.im</code> and <code>matrix.org</code> instances).</p>
+<h3 id="email"><a class="header" href="#email">Email</a></h3>
+<p>Following upgrade, to continue verifying email (e.g. as part of the
+registration process), admins can either:-</p>
+<ul>
+<li>Configure Synapse to use an email server.</li>
+<li>Run or choose an identity server which allows delegated email
+verification and delegate to it.</li>
+</ul>
+<h4 id="configure-smtp-in-synapse"><a class="header" href="#configure-smtp-in-synapse">Configure SMTP in Synapse</a></h4>
+<p>To configure an SMTP server for Synapse, modify the configuration
+section headed <code>email</code>, and be sure to have at least the
+<code>smtp_host, smtp_port</code> and <code>notif_from</code> fields filled out.</p>
+<p>You may also need to set <code>smtp_user</code>, <code>smtp_pass</code>, and
+<code>require_transport_security</code>.</p>
+<p>See the <a href="usage/configuration/homeserver_sample_config.html">sample configuration file</a>
+for more details on these settings.</p>
+<h4 id="delegate-email-to-an-identity-server"><a class="header" href="#delegate-email-to-an-identity-server">Delegate email to an identity server</a></h4>
+<p>Some admins will wish to continue using email verification as part of
+the registration process, but will not immediately have an appropriate
+SMTP server at hand.</p>
+<p>To this end, we will continue to support email verification delegation
+via the <code>vector.im</code> and <code>matrix.org</code> identity servers for two months.
+Support for delegated email verification will be disabled on Monday 2nd
+December.</p>
+<p>The <code>account_threepid_delegates</code> dictionary defines whether the
+homeserver should delegate an external server (typically an <a href="https://matrix.org/docs/spec/identity_service/r0.2.1">identity
+server</a>) to handle
+sending confirmation messages via email and SMS.</p>
+<p>So to delegate email verification, in <code>homeserver.yaml</code>, set
+<code>account_threepid_delegates.email</code> to the base URL of an identity
+server. For example:</p>
+<pre><code class="language-yaml">account_threepid_delegates:
+    email: https://example.com     # Delegate email sending to example.com
+</code></pre>
+<p>Note that <code>account_threepid_delegates.email</code> replaces the deprecated
+<code>email.trust_identity_server_for_password_resets</code>: if
+<code>email.trust_identity_server_for_password_resets</code> is set to <code>true</code>, and
+<code>account_threepid_delegates.email</code> is not set, then the first entry in
+<code>trusted_third_party_id_servers</code> will be used as the
+<code>account_threepid_delegate</code> for email. This is to ensure compatibility
+with existing Synapse installs that set up external server handling for
+these tasks before v1.4.0. If
+<code>email.trust_identity_server_for_password_resets</code> is <code>true</code> and no
+trusted identity server domains are configured, Synapse will report an
+error and refuse to start.</p>
+<p>If <code>email.trust_identity_server_for_password_resets</code> is <code>false</code> or
+absent and no <code>email</code> delegate is configured in
+<code>account_threepid_delegates</code>, then Synapse will send email verification
+messages itself, using the configured SMTP server (see above). that
+type.</p>
+<h3 id="phone-numbers"><a class="header" href="#phone-numbers">Phone numbers</a></h3>
+<p>Synapse does not support phone-number verification itself, so the only
+way to maintain the ability for users to add phone numbers to their
+accounts will be by continuing to delegate phone number verification to
+the <code>matrix.org</code> and <code>vector.im</code> identity servers (or another identity
+server that supports SMS sending).</p>
+<p>The <code>account_threepid_delegates</code> dictionary defines whether the
+homeserver should delegate an external server (typically an <a href="https://matrix.org/docs/spec/identity_service/r0.2.1">identity
+server</a>) to handle
+sending confirmation messages via email and SMS.</p>
+<p>So to delegate phone number verification, in <code>homeserver.yaml</code>, set
+<code>account_threepid_delegates.msisdn</code> to the base URL of an identity
+server. For example:</p>
+<pre><code class="language-yaml">account_threepid_delegates:
+    msisdn: https://example.com     # Delegate sms sending to example.com
+</code></pre>
+<p>The <code>matrix.org</code> and <code>vector.im</code> identity servers will continue to
+support delegated phone number verification via SMS until such time as
+it is possible for admins to configure their servers to perform phone
+number verification directly. More details will follow in a future
+release.</p>
+<h2 id="rolling-back-to-v131"><a class="header" href="#rolling-back-to-v131">Rolling back to v1.3.1</a></h2>
+<p>If you encounter problems with v1.4.0, it should be possible to roll
+back to v1.3.1, subject to the following:</p>
+<ul>
+<li>
+<p>The 'room statistics' engine was heavily reworked in this release
+(see <a href="https://github.com/matrix-org/synapse/pull/5971">#5971</a>),
+including significant changes to the database schema, which are not
+easily reverted. This will cause the room statistics engine to stop
+updating when you downgrade.</p>
+<p>The room statistics are essentially unused in v1.3.1 (in future
+versions of Synapse, they will be used to populate the room
+directory), so there should be no loss of functionality. However,
+the statistics engine will write errors to the logs, which can be
+avoided by setting the following in <code>homeserver.yaml</code>:</p>
+<pre><code class="language-yaml">stats:
+  enabled: false
+</code></pre>
+<p>Don't forget to re-enable it when you upgrade again, in preparation
+for its use in the room directory!</p>
+</li>
+</ul>
+<h1 id="upgrading-to-v120"><a class="header" href="#upgrading-to-v120">Upgrading to v1.2.0</a></h1>
+<p>Some counter metrics have been renamed, with the old names deprecated.
+See <a href="metrics-howto.html#renaming-of-metrics--deprecation-of-old-names-in-12">the metrics
+documentation</a>
+for details.</p>
+<h1 id="upgrading-to-v110"><a class="header" href="#upgrading-to-v110">Upgrading to v1.1.0</a></h1>
+<p>Synapse v1.1.0 removes support for older Python and PostgreSQL versions,
+as outlined in <a href="https://matrix.org/blog/2019/04/08/synapse-deprecating-postgres-9-4-and-python-2-x">our deprecation
+notice</a>.</p>
+<h2 id="minimum-python-version"><a class="header" href="#minimum-python-version">Minimum Python Version</a></h2>
+<p>Synapse v1.1.0 has a minimum Python requirement of Python 3.5. Python
+3.6 or Python 3.7 are recommended as they have improved internal string
+handling, significantly reducing memory usage.</p>
+<p>If you use current versions of the Matrix.org-distributed Debian
+packages or Docker images, action is not required.</p>
+<p>If you install Synapse in a Python virtual environment, please see
+&quot;Upgrading to v0.34.0&quot; for notes on setting up a new virtualenv under
+Python 3.</p>
+<h2 id="minimum-postgresql-version"><a class="header" href="#minimum-postgresql-version">Minimum PostgreSQL Version</a></h2>
+<p>If using PostgreSQL under Synapse, you will need to use PostgreSQL 9.5
+or above. Please see the <a href="https://www.postgresql.org/docs/11/upgrading.html">PostgreSQL
+documentation</a> for
+more details on upgrading your database.</p>
+<h1 id="upgrading-to-v10"><a class="header" href="#upgrading-to-v10">Upgrading to v1.0</a></h1>
+<h2 id="validation-of-tls-certificates"><a class="header" href="#validation-of-tls-certificates">Validation of TLS certificates</a></h2>
+<p>Synapse v1.0 is the first release to enforce validation of TLS
+certificates for the federation API. It is therefore essential that your
+certificates are correctly configured.</p>
+<p>Note, v1.0 installations will also no longer be able to federate with
+servers that have not correctly configured their certificates.</p>
+<p>In rare cases, it may be desirable to disable certificate checking: for
+example, it might be essential to be able to federate with a given
+legacy server in a closed federation. This can be done in one of two
+ways:-</p>
+<ul>
+<li>Configure the global switch <code>federation_verify_certificates</code> to
+<code>false</code>.</li>
+<li>Configure a whitelist of server domains to trust via
+<code>federation_certificate_verification_whitelist</code>.</li>
+</ul>
+<p>See the <a href="usage/configuration/homeserver_sample_config.html">sample configuration file</a>
+for more details on these settings.</p>
+<h2 id="email-1"><a class="header" href="#email-1">Email</a></h2>
+<p>When a user requests a password reset, Synapse will send an email to the
+user to confirm the request.</p>
+<p>Previous versions of Synapse delegated the job of sending this email to
+an identity server. If the identity server was somehow malicious or
+became compromised, it would be theoretically possible to hijack an
+account through this means.</p>
+<p>Therefore, by default, Synapse v1.0 will send the confirmation email
+itself. If Synapse is not configured with an SMTP server, password reset
+via email will be disabled.</p>
+<p>To configure an SMTP server for Synapse, modify the configuration
+section headed <code>email</code>, and be sure to have at least the <code>smtp_host</code>,
+<code>smtp_port</code> and <code>notif_from</code> fields filled out. You may also need to set
+<code>smtp_user</code>, <code>smtp_pass</code>, and <code>require_transport_security</code>.</p>
+<p>If you are absolutely certain that you wish to continue using an
+identity server for password resets, set
+<code>trust_identity_server_for_password_resets</code> to <code>true</code>.</p>
+<p>See the <a href="usage/configuration/homeserver_sample_config.html">sample configuration file</a>
+for more details on these settings.</p>
+<h2 id="new-email-templates"><a class="header" href="#new-email-templates">New email templates</a></h2>
+<p>Some new templates have been added to the default template directory for the purpose of
+the homeserver sending its own password reset emails. If you have configured a
+custom <code>template_dir</code> in your Synapse config, these files will need to be added.</p>
+<p><code>password_reset.html</code> and <code>password_reset.txt</code> are HTML and plain text
+templates respectively that contain the contents of what will be emailed
+to the user upon attempting to reset their password via email.
+<code>password_reset_success.html</code> and <code>password_reset_failure.html</code> are HTML
+files that the content of which (assuming no redirect URL is set) will
+be shown to the user after they attempt to click the link in the email
+sent to them.</p>
+<h1 id="upgrading-to-v0990"><a class="header" href="#upgrading-to-v0990">Upgrading to v0.99.0</a></h1>
+<p>Please be aware that, before Synapse v1.0 is released around March 2019,
+you will need to replace any self-signed certificates with those
+verified by a root CA. Information on how to do so can be found at the
+ACME docs.</p>
+<h1 id="upgrading-to-v0340"><a class="header" href="#upgrading-to-v0340">Upgrading to v0.34.0</a></h1>
+<ol>
+<li>
+<p>This release is the first to fully support Python 3. Synapse will
+now run on Python versions 3.5, or 3.6 (as well as 2.7). We
+recommend switching to Python 3, as it has been shown to give
+performance improvements.</p>
+<p>For users who have installed Synapse into a virtualenv, we recommend
+doing this by creating a new virtualenv. For example:</p>
+<pre><code class="language-sh">virtualenv -p python3 ~/synapse/env3
+source ~/synapse/env3/bin/activate
+pip install matrix-synapse
+</code></pre>
+<p>You can then start synapse as normal, having activated the new
+virtualenv:</p>
+<pre><code class="language-sh">cd ~/synapse
+source env3/bin/activate
+synctl start
+</code></pre>
+<p>Users who have installed from distribution packages should see the
+relevant package documentation. See below for notes on Debian
+packages.</p>
+<ul>
+<li>
+<p>When upgrading to Python 3, you <strong>must</strong> make sure that your log
+files are configured as UTF-8, by adding <code>encoding: utf8</code> to the
+<code>RotatingFileHandler</code> configuration (if you have one) in your
+<code>&lt;server&gt;.log.config</code> file. For example, if your <code>log.config</code>
+file contains:</p>
+<pre><code class="language-yaml">handlers:
+  file:
+    class: logging.handlers.RotatingFileHandler
+    formatter: precise
+    filename: homeserver.log
+    maxBytes: 104857600
+    backupCount: 10
+    filters: [context]
+  console:
+    class: logging.StreamHandler
+    formatter: precise
+    filters: [context]
+</code></pre>
+<p>Then you should update this to be:</p>
+<pre><code class="language-yaml">handlers:
+  file:
+    class: logging.handlers.RotatingFileHandler
+    formatter: precise
+    filename: homeserver.log
+    maxBytes: 104857600
+    backupCount: 10
+    filters: [context]
+    encoding: utf8
+  console:
+    class: logging.StreamHandler
+    formatter: precise
+    filters: [context]
+</code></pre>
+<p>There is no need to revert this change if downgrading to
+Python 2.</p>
+</li>
+</ul>
+<p>We are also making available Debian packages which will run Synapse
+on Python 3. You can switch to these packages with
+<code>apt-get install matrix-synapse-py3</code>, however, please read
+<a href="https://github.com/matrix-org/synapse/blob/release-v0.34.0/debian/NEWS">debian/NEWS</a>
+before doing so. The existing <code>matrix-synapse</code> packages will
+continue to use Python 2 for the time being.</p>
+</li>
+<li>
+<p>This release removes the <code>riot.im</code> from the default list of trusted
+identity servers.</p>
+<p>If <code>riot.im</code> is in your homeserver's list of
+<code>trusted_third_party_id_servers</code>, you should remove it. It was added
+in case a hypothetical future identity server was put there. If you
+don't remove it, users may be unable to deactivate their accounts.</p>
+</li>
+<li>
+<p>This release no longer installs the (unmaintained) Matrix Console
+web client as part of the default installation. It is possible to
+re-enable it by installing it separately and setting the
+<code>web_client_location</code> config option, but please consider switching
+to another client.</p>
+</li>
+</ol>
+<h1 id="upgrading-to-v0337"><a class="header" href="#upgrading-to-v0337">Upgrading to v0.33.7</a></h1>
+<p>This release removes the example email notification templates from
+<code>res/templates</code> (they are now internal to the python package). This
+should only affect you if you (a) deploy your Synapse instance from a
+git checkout or a github snapshot URL, and (b) have email notifications
+enabled.</p>
+<p>If you have email notifications enabled, you should ensure that
+<code>email.template_dir</code> is either configured to point at a directory where
+you have installed customised templates, or leave it unset to use the
+default templates.</p>
+<h1 id="upgrading-to-v0273"><a class="header" href="#upgrading-to-v0273">Upgrading to v0.27.3</a></h1>
+<p>This release expands the anonymous usage stats sent if the opt-in
+<code>report_stats</code> configuration is set to <code>true</code>. We now capture RSS memory
+and cpu use at a very coarse level. This requires administrators to
+install the optional <code>psutil</code> python module.</p>
+<p>We would appreciate it if you could assist by ensuring this module is
+available and <code>report_stats</code> is enabled. This will let us see if
+performance changes to synapse are having an impact to the general
+community.</p>
+<h1 id="upgrading-to-v0150"><a class="header" href="#upgrading-to-v0150">Upgrading to v0.15.0</a></h1>
+<p>If you want to use the new URL previewing API
+(<code>/_matrix/media/r0/preview_url</code>) then you have to explicitly enable it
+in the config and update your dependencies dependencies. See README.rst
+for details.</p>
+<h1 id="upgrading-to-v0110"><a class="header" href="#upgrading-to-v0110">Upgrading to v0.11.0</a></h1>
+<p>This release includes the option to send anonymous usage stats to
+matrix.org, and requires that administrators explictly opt in or out by
+setting the <code>report_stats</code> option to either <code>true</code> or <code>false</code>.</p>
+<p>We would really appreciate it if you could help our project out by
+reporting anonymized usage statistics from your homeserver. Only very
+basic aggregate data (e.g. number of users) will be reported, but it
+helps us to track the growth of the Matrix community, and helps us to
+make Matrix a success, as well as to convince other networks that they
+should peer with us.</p>
+<h1 id="upgrading-to-v090"><a class="header" href="#upgrading-to-v090">Upgrading to v0.9.0</a></h1>
+<p>Application services have had a breaking API change in this version.</p>
+<p>They can no longer register themselves with a home server using the AS
+HTTP API. This decision was made because a compromised application
+service with free reign to register any regex in effect grants full
+read/write access to the home server if a regex of <code>.*</code> is used. An
+attack where a compromised AS re-registers itself with <code>.*</code> was deemed
+too big of a security risk to ignore, and so the ability to register
+with the HS remotely has been removed.</p>
+<p>It has been replaced by specifying a list of application service
+registrations in <code>homeserver.yaml</code>:</p>
+<pre><code class="language-yaml">app_service_config_files: [&quot;registration-01.yaml&quot;, &quot;registration-02.yaml&quot;]
+</code></pre>
+<p>Where <code>registration-01.yaml</code> looks like:</p>
+<pre><code class="language-yaml">url: &lt;String&gt;  # e.g. &quot;https://my.application.service.com&quot;
+as_token: &lt;String&gt;
+hs_token: &lt;String&gt;
+sender_localpart: &lt;String&gt;  # This is a new field which denotes the user_id localpart when using the AS token
+namespaces:
+  users:
+    - exclusive: &lt;Boolean&gt;
+      regex: &lt;String&gt;  # e.g. &quot;@prefix_.*&quot;
+  aliases:
+    - exclusive: &lt;Boolean&gt;
+      regex: &lt;String&gt;
+  rooms:
+    - exclusive: &lt;Boolean&gt;
+      regex: &lt;String&gt;
+</code></pre>
+<h1 id="upgrading-to-v080"><a class="header" href="#upgrading-to-v080">Upgrading to v0.8.0</a></h1>
+<p>Servers which use captchas will need to add their public key to:</p>
+<pre><code>static/client/register/register_config.js
+
+  window.matrixRegistrationConfig = {
+      recaptcha_public_key: &quot;YOUR_PUBLIC_KEY&quot;
+  };
+</code></pre>
+<p>This is required in order to support registration fallback (typically
+used on mobile devices).</p>
+<h1 id="upgrading-to-v070"><a class="header" href="#upgrading-to-v070">Upgrading to v0.7.0</a></h1>
+<p>New dependencies are:</p>
+<ul>
+<li>pydenticon</li>
+<li>simplejson</li>
+<li>syutil</li>
+<li>matrix-angular-sdk</li>
+</ul>
+<p>To pull in these dependencies in a virtual env, run:</p>
+<pre><code>python synapse/python_dependencies.py | xargs -n 1 pip install
+</code></pre>
+<h1 id="upgrading-to-v060"><a class="header" href="#upgrading-to-v060">Upgrading to v0.6.0</a></h1>
+<p>To pull in new dependencies, run:</p>
+<pre><code>python setup.py develop --user
+</code></pre>
+<p>This update includes a change to the database schema. To upgrade you
+first need to upgrade the database by running:</p>
+<pre><code>python scripts/upgrade_db_to_v0.6.0.py &lt;db&gt; &lt;server_name&gt; &lt;signing_key&gt;
+</code></pre>
+<p>Where <code>&lt;db&gt;</code> is the location of the database,
+<code>&lt;server_name&gt;</code> is the server name as specified in the
+synapse configuration, and <code>&lt;signing_key&gt;</code> is the location
+of the signing key as specified in the synapse configuration.</p>
+<p>This may take some time to complete. Failures of signatures and content
+hashes can safely be ignored.</p>
+<h1 id="upgrading-to-v051"><a class="header" href="#upgrading-to-v051">Upgrading to v0.5.1</a></h1>
+<p>Depending on precisely when you installed v0.5.0 you may have ended up
+with a stale release of the reference matrix webclient installed as a
+python module. To uninstall it and ensure you are depending on the
+latest module, please run:</p>
+<pre><code>$ pip uninstall syweb
+</code></pre>
+<h1 id="upgrading-to-v050"><a class="header" href="#upgrading-to-v050">Upgrading to v0.5.0</a></h1>
+<p>The webclient has been split out into a seperate repository/pacakage in
+this release. Before you restart your homeserver you will need to pull
+in the webclient package by running:</p>
+<pre><code>python setup.py develop --user
+</code></pre>
+<p>This release completely changes the database schema and so requires
+upgrading it before starting the new version of the homeserver.</p>
+<p>The script &quot;database-prepare-for-0.5.0.sh&quot; should be used to upgrade
+the database. This will save all user information, such as logins and
+profiles, but will otherwise purge the database. This includes messages,
+which rooms the home server was a member of and room alias mappings.</p>
+<p>If you would like to keep your history, please take a copy of your
+database file and ask for help in #matrix:matrix.org. The upgrade
+process is, unfortunately, non trivial and requires human intervention
+to resolve any resulting conflicts during the upgrade process.</p>
+<p>Before running the command the homeserver should be first completely
+shutdown. To run it, simply specify the location of the database, e.g.:</p>
+<blockquote>
+<p>./scripts/database-prepare-for-0.5.0.sh &quot;homeserver.db&quot;</p>
+</blockquote>
+<p>Once this has successfully completed it will be safe to restart the
+homeserver. You may notice that the homeserver takes a few seconds
+longer to restart than usual as it reinitializes the database.</p>
+<p>On startup of the new version, users can either rejoin remote rooms
+using room aliases or by being reinvited. Alternatively, if any other
+homeserver sends a message to a room that the homeserver was previously
+in the local HS will automatically rejoin the room.</p>
+<h1 id="upgrading-to-v040"><a class="header" href="#upgrading-to-v040">Upgrading to v0.4.0</a></h1>
+<p>This release needs an updated syutil version. Run:</p>
+<pre><code>python setup.py develop
+</code></pre>
+<p>You will also need to upgrade your configuration as the signing key
+format has changed. Run:</p>
+<pre><code>python -m synapse.app.homeserver --config-path &lt;CONFIG&gt; --generate-config
+</code></pre>
+<h1 id="upgrading-to-v030"><a class="header" href="#upgrading-to-v030">Upgrading to v0.3.0</a></h1>
+<p>This registration API now closely matches the login API. This introduces
+a bit more backwards and forwards between the HS and the client, but
+this improves the overall flexibility of the API. You can now GET on
+/register to retrieve a list of valid registration flows. Upon choosing
+one, they are submitted in the same way as login, e.g:</p>
+<pre><code>{
+  type: m.login.password,
+  user: foo,
+  password: bar
+}
+</code></pre>
+<p>The default HS supports 2 flows, with and without Identity Server email
+authentication. Enabling captcha on the HS will add in an extra step to
+all flows: <code>m.login.recaptcha</code> which must be completed before you can
+transition to the next stage. There is a new login type:
+<code>m.login.email.identity</code> which contains the <code>threepidCreds</code> key which
+were previously sent in the original register request. For more
+information on this, see the specification.</p>
+<h2 id="web-client"><a class="header" href="#web-client">Web Client</a></h2>
+<p>The VoIP specification has changed between v0.2.0 and v0.3.0. Users
+should refresh any browser tabs to get the latest web client code. Users
+on v0.2.0 of the web client will not be able to call those on v0.3.0 and
+vice versa.</p>
+<h1 id="upgrading-to-v020"><a class="header" href="#upgrading-to-v020">Upgrading to v0.2.0</a></h1>
+<p>The home server now requires setting up of SSL config before it can run.
+To automatically generate default config use:</p>
+<pre><code>$ python synapse/app/homeserver.py \
+    --server-name machine.my.domain.name \
+    --bind-port 8448 \
+    --config-path homeserver.config \
+    --generate-config
+</code></pre>
+<p>This config can be edited if desired, for example to specify a different
+SSL certificate to use. Once done you can run the home server using:</p>
+<pre><code>$ python synapse/app/homeserver.py --config-path homeserver.config
+</code></pre>
+<p>See the README.rst for more information.</p>
+<p>Also note that some config options have been renamed, including:</p>
+<ul>
+<li>&quot;host&quot; to &quot;server-name&quot;</li>
+<li>&quot;database&quot; to &quot;database-path&quot;</li>
+<li>&quot;port&quot; to &quot;bind-port&quot; and &quot;unsecure-port&quot;</li>
+</ul>
+<h1 id="upgrading-to-v001"><a class="header" href="#upgrading-to-v001">Upgrading to v0.0.1</a></h1>
+<p>This release completely changes the database schema and so requires
+upgrading it before starting the new version of the homeserver.</p>
+<p>The script &quot;database-prepare-for-0.0.1.sh&quot; should be used to upgrade
+the database. This will save all user information, such as logins and
+profiles, but will otherwise purge the database. This includes messages,
+which rooms the home server was a member of and room alias mappings.</p>
+<p>Before running the command the homeserver should be first completely
+shutdown. To run it, simply specify the location of the database, e.g.:</p>
+<blockquote>
+<p>./scripts/database-prepare-for-0.0.1.sh &quot;homeserver.db&quot;</p>
+</blockquote>
+<p>Once this has successfully completed it will be safe to restart the
+homeserver. You may notice that the homeserver takes a few seconds
+longer to restart than usual as it reinitializes the database.</p>
+<p>On startup of the new version, users can either rejoin remote rooms
+using room aliases or by being reinvited. Alternatively, if any other
+homeserver sends a message to a room that the homeserver was previously
+in the local HS will automatically rejoin the room.</p>
+
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