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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 "metrics" 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: "synapse"
- scrape_interval: 15s
- metrics_path: "/_synapse/metrics"
- static_configs:
- - targets: ["my.server.here:port"]
- </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: "synapse"
- scrape_interval: 15s
- metrics_path: "/_synapse/metrics"
- static_configs:
- - targets: ["my.server.here:port"]
- labels:
- instance: "my.server"
- job: "master"
- index: 1
- - targets: ["my.workerserver.here:port"]
- labels:
- instance: "my.server"
- job: "generic_worker"
- index: 1
- - targets: ["my.workerserver.here:port"]
- labels:
- instance: "my.server"
- job: "generic_worker"
- index: 2
- - targets: ["my.workerserver.here:port"]
- labels:
- instance: "my.server"
- job: "media_repository"
- 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 & 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 & 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 -> 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>
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