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+
+                        <h1 id="how-to-monitor-synapse-metrics-using-prometheus"><a class="header" href="#how-to-monitor-synapse-metrics-using-prometheus">How to monitor Synapse metrics using Prometheus</a></h1>
+<ol>
+<li>
+<p>Install Prometheus:</p>
+<p>Follow instructions at
+<a href="http://prometheus.io/docs/introduction/install/">http://prometheus.io/docs/introduction/install/</a></p>
+</li>
+<li>
+<p>Enable Synapse metrics:</p>
+<p>In <code>homeserver.yaml</code>, make sure <code>enable_metrics</code> is
+set to <code>True</code>.</p>
+</li>
+<li>
+<p>Enable the <code>/_synapse/metrics</code> Synapse endpoint that Prometheus uses to
+collect data:</p>
+<p>There are two methods of enabling the metrics endpoint in Synapse.</p>
+<p>The first serves the metrics as a part of the usual web server and
+can be enabled by adding the <code>metrics</code> resource to the existing
+listener as such as in this example:</p>
+<pre><code class="language-yaml">listeners:
+  - port: 8008
+    tls: false
+    type: http
+    x_forwarded: true
+    bind_addresses: ['::1', '127.0.0.1']
+
+    resources:
+      # added &quot;metrics&quot; in this line
+      - names: [client, federation, metrics]
+        compress: false
+</code></pre>
+<p>This provides a simple way of adding metrics to your Synapse
+installation, and serves under <code>/_synapse/metrics</code>. If you do not
+wish your metrics be publicly exposed, you will need to either
+filter it out at your load balancer, or use the second method.</p>
+<p>The second method runs the metrics server on a different port, in a
+different thread to Synapse. This can make it more resilient to
+heavy load meaning metrics cannot be retrieved, and can be exposed
+to just internal networks easier. The served metrics are available
+over HTTP only, and will be available at <code>/_synapse/metrics</code>.</p>
+<p>Add a new listener to homeserver.yaml as in this example:</p>
+<pre><code class="language-yaml">listeners:
+  - port: 8008
+    tls: false
+    type: http
+    x_forwarded: true
+    bind_addresses: ['::1', '127.0.0.1']
+
+    resources:
+      - names: [client, federation]
+        compress: false
+
+  # beginning of the new metrics listener
+  - port: 9000
+    type: metrics
+    bind_addresses: ['::1', '127.0.0.1']
+</code></pre>
+</li>
+<li>
+<p>Restart Synapse.</p>
+</li>
+<li>
+<p>Add a Prometheus target for Synapse.</p>
+<p>It needs to set the <code>metrics_path</code> to a non-default value (under
+<code>scrape_configs</code>):</p>
+<pre><code class="language-yaml">  - job_name: &quot;synapse&quot;
+    scrape_interval: 15s
+    metrics_path: &quot;/_synapse/metrics&quot;
+    static_configs:
+      - targets: [&quot;my.server.here:port&quot;]
+</code></pre>
+<p>where <code>my.server.here</code> is the IP address of Synapse, and <code>port</code> is
+the listener port configured with the <code>metrics</code> resource.</p>
+<p>If your prometheus is older than 1.5.2, you will need to replace
+<code>static_configs</code> in the above with <code>target_groups</code>.</p>
+</li>
+<li>
+<p>Restart Prometheus.</p>
+</li>
+<li>
+<p>Consider using the <a href="https://github.com/matrix-org/synapse/tree/master/contrib/grafana/">grafana dashboard</a>
+and required <a href="https://github.com/matrix-org/synapse/tree/master/contrib/prometheus/">recording rules</a> </p>
+</li>
+</ol>
+<h2 id="monitoring-workers"><a class="header" href="#monitoring-workers">Monitoring workers</a></h2>
+<p>To monitor a Synapse installation using <a href="workers.html">workers</a>,
+every worker needs to be monitored independently, in addition to
+the main homeserver process. This is because workers don't send
+their metrics to the main homeserver process, but expose them
+directly (if they are configured to do so).</p>
+<p>To allow collecting metrics from a worker, you need to add a
+<code>metrics</code> listener to its configuration, by adding the following
+under <code>worker_listeners</code>:</p>
+<pre><code class="language-yaml">  - type: metrics
+    bind_address: ''
+    port: 9101
+</code></pre>
+<p>The <code>bind_address</code> and <code>port</code> parameters should be set so that
+the resulting listener can be reached by prometheus, and they
+don't clash with an existing worker.
+With this example, the worker's metrics would then be available
+on <code>http://127.0.0.1:9101</code>.</p>
+<p>Example Prometheus target for Synapse with workers:</p>
+<pre><code class="language-yaml">  - job_name: &quot;synapse&quot;
+    scrape_interval: 15s
+    metrics_path: &quot;/_synapse/metrics&quot;
+    static_configs:
+      - targets: [&quot;my.server.here:port&quot;]
+        labels:
+          instance: &quot;my.server&quot;
+          job: &quot;master&quot;
+          index: 1
+      - targets: [&quot;my.workerserver.here:port&quot;]
+        labels:
+          instance: &quot;my.server&quot;
+          job: &quot;generic_worker&quot;
+          index: 1
+      - targets: [&quot;my.workerserver.here:port&quot;]
+        labels:
+          instance: &quot;my.server&quot;
+          job: &quot;generic_worker&quot;
+          index: 2
+      - targets: [&quot;my.workerserver.here:port&quot;]
+        labels:
+          instance: &quot;my.server&quot;
+          job: &quot;media_repository&quot;
+          index: 1
+</code></pre>
+<p>Labels (<code>instance</code>, <code>job</code>, <code>index</code>) can be defined as anything.
+The labels are used to group graphs in grafana.</p>
+<h2 id="renaming-of-metrics--deprecation-of-old-names-in-12"><a class="header" href="#renaming-of-metrics--deprecation-of-old-names-in-12">Renaming of metrics &amp; deprecation of old names in 1.2</a></h2>
+<p>Synapse 1.2 updates the Prometheus metrics to match the naming
+convention of the upstream <code>prometheus_client</code>. The old names are
+considered deprecated and will be removed in a future version of
+Synapse.
+<strong>The old names will be disabled by default in Synapse v1.71.0 and removed
+altogether in Synapse v1.73.0.</strong></p>
+<table><thead><tr><th>New Name</th><th>Old Name</th></tr></thead><tbody>
+<tr><td>python_gc_objects_collected_total</td><td>python_gc_objects_collected</td></tr>
+<tr><td>python_gc_objects_uncollectable_total</td><td>python_gc_objects_uncollectable</td></tr>
+<tr><td>python_gc_collections_total</td><td>python_gc_collections</td></tr>
+<tr><td>process_cpu_seconds_total</td><td>process_cpu_seconds</td></tr>
+<tr><td>synapse_federation_client_sent_transactions_total</td><td>synapse_federation_client_sent_transactions</td></tr>
+<tr><td>synapse_federation_client_events_processed_total</td><td>synapse_federation_client_events_processed</td></tr>
+<tr><td>synapse_event_processing_loop_count_total</td><td>synapse_event_processing_loop_count</td></tr>
+<tr><td>synapse_event_processing_loop_room_count_total</td><td>synapse_event_processing_loop_room_count</td></tr>
+<tr><td>synapse_util_caches_cache_hits</td><td>synapse_util_caches_cache:hits</td></tr>
+<tr><td>synapse_util_caches_cache_size</td><td>synapse_util_caches_cache:size</td></tr>
+<tr><td>synapse_util_caches_cache_evicted_size</td><td>synapse_util_caches_cache:evicted_size</td></tr>
+<tr><td>synapse_util_caches_cache</td><td>synapse_util_caches_cache:total</td></tr>
+<tr><td>synapse_util_caches_response_cache_size</td><td>synapse_util_caches_response_cache:size</td></tr>
+<tr><td>synapse_util_caches_response_cache_hits</td><td>synapse_util_caches_response_cache:hits</td></tr>
+<tr><td>synapse_util_caches_response_cache_evicted_size</td><td>synapse_util_caches_response_cache:evicted_size</td></tr>
+<tr><td>synapse_util_metrics_block_count_total</td><td>synapse_util_metrics_block_count</td></tr>
+<tr><td>synapse_util_metrics_block_time_seconds_total</td><td>synapse_util_metrics_block_time_seconds</td></tr>
+<tr><td>synapse_util_metrics_block_ru_utime_seconds_total</td><td>synapse_util_metrics_block_ru_utime_seconds</td></tr>
+<tr><td>synapse_util_metrics_block_ru_stime_seconds_total</td><td>synapse_util_metrics_block_ru_stime_seconds</td></tr>
+<tr><td>synapse_util_metrics_block_db_txn_count_total</td><td>synapse_util_metrics_block_db_txn_count</td></tr>
+<tr><td>synapse_util_metrics_block_db_txn_duration_seconds_total</td><td>synapse_util_metrics_block_db_txn_duration_seconds</td></tr>
+<tr><td>synapse_util_metrics_block_db_sched_duration_seconds_total</td><td>synapse_util_metrics_block_db_sched_duration_seconds</td></tr>
+<tr><td>synapse_background_process_start_count_total</td><td>synapse_background_process_start_count</td></tr>
+<tr><td>synapse_background_process_ru_utime_seconds_total</td><td>synapse_background_process_ru_utime_seconds</td></tr>
+<tr><td>synapse_background_process_ru_stime_seconds_total</td><td>synapse_background_process_ru_stime_seconds</td></tr>
+<tr><td>synapse_background_process_db_txn_count_total</td><td>synapse_background_process_db_txn_count</td></tr>
+<tr><td>synapse_background_process_db_txn_duration_seconds_total</td><td>synapse_background_process_db_txn_duration_seconds</td></tr>
+<tr><td>synapse_background_process_db_sched_duration_seconds_total</td><td>synapse_background_process_db_sched_duration_seconds</td></tr>
+<tr><td>synapse_storage_events_persisted_events_total</td><td>synapse_storage_events_persisted_events</td></tr>
+<tr><td>synapse_storage_events_persisted_events_sep_total</td><td>synapse_storage_events_persisted_events_sep</td></tr>
+<tr><td>synapse_storage_events_state_delta_total</td><td>synapse_storage_events_state_delta</td></tr>
+<tr><td>synapse_storage_events_state_delta_single_event_total</td><td>synapse_storage_events_state_delta_single_event</td></tr>
+<tr><td>synapse_storage_events_state_delta_reuse_delta_total</td><td>synapse_storage_events_state_delta_reuse_delta</td></tr>
+<tr><td>synapse_federation_server_received_pdus_total</td><td>synapse_federation_server_received_pdus</td></tr>
+<tr><td>synapse_federation_server_received_edus_total</td><td>synapse_federation_server_received_edus</td></tr>
+<tr><td>synapse_handler_presence_notified_presence_total</td><td>synapse_handler_presence_notified_presence</td></tr>
+<tr><td>synapse_handler_presence_federation_presence_out_total</td><td>synapse_handler_presence_federation_presence_out</td></tr>
+<tr><td>synapse_handler_presence_presence_updates_total</td><td>synapse_handler_presence_presence_updates</td></tr>
+<tr><td>synapse_handler_presence_timers_fired_total</td><td>synapse_handler_presence_timers_fired</td></tr>
+<tr><td>synapse_handler_presence_federation_presence_total</td><td>synapse_handler_presence_federation_presence</td></tr>
+<tr><td>synapse_handler_presence_bump_active_time_total</td><td>synapse_handler_presence_bump_active_time</td></tr>
+<tr><td>synapse_federation_client_sent_edus_total</td><td>synapse_federation_client_sent_edus</td></tr>
+<tr><td>synapse_federation_client_sent_pdu_destinations_count_total</td><td>synapse_federation_client_sent_pdu_destinations:count</td></tr>
+<tr><td>synapse_federation_client_sent_pdu_destinations_total</td><td>synapse_federation_client_sent_pdu_destinations:total</td></tr>
+<tr><td>synapse_handlers_appservice_events_processed_total</td><td>synapse_handlers_appservice_events_processed</td></tr>
+<tr><td>synapse_notifier_notified_events_total</td><td>synapse_notifier_notified_events</td></tr>
+<tr><td>synapse_push_bulk_push_rule_evaluator_push_rules_invalidation_counter_total</td><td>synapse_push_bulk_push_rule_evaluator_push_rules_invalidation_counter</td></tr>
+<tr><td>synapse_push_bulk_push_rule_evaluator_push_rules_state_size_counter_total</td><td>synapse_push_bulk_push_rule_evaluator_push_rules_state_size_counter</td></tr>
+<tr><td>synapse_http_httppusher_http_pushes_processed_total</td><td>synapse_http_httppusher_http_pushes_processed</td></tr>
+<tr><td>synapse_http_httppusher_http_pushes_failed_total</td><td>synapse_http_httppusher_http_pushes_failed</td></tr>
+<tr><td>synapse_http_httppusher_badge_updates_processed_total</td><td>synapse_http_httppusher_badge_updates_processed</td></tr>
+<tr><td>synapse_http_httppusher_badge_updates_failed_total</td><td>synapse_http_httppusher_badge_updates_failed</td></tr>
+<tr><td>synapse_admin_mau_current</td><td>synapse_admin_mau:current</td></tr>
+<tr><td>synapse_admin_mau_max</td><td>synapse_admin_mau:max</td></tr>
+<tr><td>synapse_admin_mau_registered_reserved_users</td><td>synapse_admin_mau:registered_reserved_users</td></tr>
+</tbody></table>
+<h2 id="removal-of-deprecated-metrics--time-based-counters-becoming-histograms-in-0310"><a class="header" href="#removal-of-deprecated-metrics--time-based-counters-becoming-histograms-in-0310">Removal of deprecated metrics &amp; time based counters becoming histograms in 0.31.0</a></h2>
+<p>The duplicated metrics deprecated in Synapse 0.27.0 have been removed.</p>
+<p>All time duration-based metrics have been changed to be seconds. This
+affects:</p>
+<table><thead><tr><th>msec -&gt; sec metrics</th></tr></thead><tbody>
+<tr><td>python_gc_time</td></tr>
+<tr><td>python_twisted_reactor_tick_time</td></tr>
+<tr><td>synapse_storage_query_time</td></tr>
+<tr><td>synapse_storage_schedule_time</td></tr>
+<tr><td>synapse_storage_transaction_time</td></tr>
+</tbody></table>
+<p>Several metrics have been changed to be histograms, which sort entries
+into buckets and allow better analysis. The following metrics are now
+histograms:</p>
+<table><thead><tr><th>Altered metrics</th></tr></thead><tbody>
+<tr><td>python_gc_time</td></tr>
+<tr><td>python_twisted_reactor_pending_calls</td></tr>
+<tr><td>python_twisted_reactor_tick_time</td></tr>
+<tr><td>synapse_http_server_response_time_seconds</td></tr>
+<tr><td>synapse_storage_query_time</td></tr>
+<tr><td>synapse_storage_schedule_time</td></tr>
+<tr><td>synapse_storage_transaction_time</td></tr>
+</tbody></table>
+<h2 id="block-and-response-metrics-renamed-for-0270"><a class="header" href="#block-and-response-metrics-renamed-for-0270">Block and response metrics renamed for 0.27.0</a></h2>
+<p>Synapse 0.27.0 begins the process of rationalising the duplicate
+<code>*:count</code> metrics reported for the resource tracking for code blocks and
+HTTP requests.</p>
+<p>At the same time, the corresponding <code>*:total</code> metrics are being renamed,
+as the <code>:total</code> suffix no longer makes sense in the absence of a
+corresponding <code>:count</code> metric.</p>
+<p>To enable a graceful migration path, this release just adds new names
+for the metrics being renamed. A future release will remove the old
+ones.</p>
+<p>The following table shows the new metrics, and the old metrics which
+they are replacing.</p>
+<table><thead><tr><th>New name</th><th>Old name</th></tr></thead><tbody>
+<tr><td>synapse_util_metrics_block_count</td><td>synapse_util_metrics_block_timer:count</td></tr>
+<tr><td>synapse_util_metrics_block_count</td><td>synapse_util_metrics_block_ru_utime:count</td></tr>
+<tr><td>synapse_util_metrics_block_count</td><td>synapse_util_metrics_block_ru_stime:count</td></tr>
+<tr><td>synapse_util_metrics_block_count</td><td>synapse_util_metrics_block_db_txn_count:count</td></tr>
+<tr><td>synapse_util_metrics_block_count</td><td>synapse_util_metrics_block_db_txn_duration:count</td></tr>
+<tr><td>synapse_util_metrics_block_time_seconds</td><td>synapse_util_metrics_block_timer:total</td></tr>
+<tr><td>synapse_util_metrics_block_ru_utime_seconds</td><td>synapse_util_metrics_block_ru_utime:total</td></tr>
+<tr><td>synapse_util_metrics_block_ru_stime_seconds</td><td>synapse_util_metrics_block_ru_stime:total</td></tr>
+<tr><td>synapse_util_metrics_block_db_txn_count</td><td>synapse_util_metrics_block_db_txn_count:total</td></tr>
+<tr><td>synapse_util_metrics_block_db_txn_duration_seconds</td><td>synapse_util_metrics_block_db_txn_duration:total</td></tr>
+<tr><td>synapse_http_server_response_count</td><td>synapse_http_server_requests</td></tr>
+<tr><td>synapse_http_server_response_count</td><td>synapse_http_server_response_time:count</td></tr>
+<tr><td>synapse_http_server_response_count</td><td>synapse_http_server_response_ru_utime:count</td></tr>
+<tr><td>synapse_http_server_response_count</td><td>synapse_http_server_response_ru_stime:count</td></tr>
+<tr><td>synapse_http_server_response_count</td><td>synapse_http_server_response_db_txn_count:count</td></tr>
+<tr><td>synapse_http_server_response_count</td><td>synapse_http_server_response_db_txn_duration:count</td></tr>
+<tr><td>synapse_http_server_response_time_seconds</td><td>synapse_http_server_response_time:total</td></tr>
+<tr><td>synapse_http_server_response_ru_utime_seconds</td><td>synapse_http_server_response_ru_utime:total</td></tr>
+<tr><td>synapse_http_server_response_ru_stime_seconds</td><td>synapse_http_server_response_ru_stime:total</td></tr>
+<tr><td>synapse_http_server_response_db_txn_count</td><td>synapse_http_server_response_db_txn_count:total</td></tr>
+<tr><td>synapse_http_server_response_db_txn_duration_seconds</td><td>synapse_http_server_response_db_txn_duration:total</td></tr>
+</tbody></table>
+<h2 id="standard-metric-names"><a class="header" href="#standard-metric-names">Standard Metric Names</a></h2>
+<p>As of synapse version 0.18.2, the format of the process-wide metrics has
+been changed to fit prometheus standard naming conventions. Additionally
+the units have been changed to seconds, from milliseconds.</p>
+<table><thead><tr><th>New name</th><th>Old name</th></tr></thead><tbody>
+<tr><td>process_cpu_user_seconds_total</td><td>process_resource_utime / 1000</td></tr>
+<tr><td>process_cpu_system_seconds_total</td><td>process_resource_stime / 1000</td></tr>
+<tr><td>process_open_fds (no 'type' label)</td><td>process_fds</td></tr>
+</tbody></table>
+<p>The python-specific counts of garbage collector performance have been
+renamed.</p>
+<table><thead><tr><th>New name</th><th>Old name</th></tr></thead><tbody>
+<tr><td>python_gc_time</td><td>reactor_gc_time</td></tr>
+<tr><td>python_gc_unreachable_total</td><td>reactor_gc_unreachable</td></tr>
+<tr><td>python_gc_counts</td><td>reactor_gc_counts</td></tr>
+</tbody></table>
+<p>The twisted-specific reactor metrics have been renamed.</p>
+<table><thead><tr><th>New name</th><th>Old name</th></tr></thead><tbody>
+<tr><td>python_twisted_reactor_pending_calls</td><td>reactor_pending_calls</td></tr>
+<tr><td>python_twisted_reactor_tick_time</td><td>reactor_tick_time</td></tr>
+</tbody></table>
+
+                    </main>
+
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