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126 lines
5.9 KiB
ReStructuredText
126 lines
5.9 KiB
ReStructuredText
How to monitor Synapse metrics using Prometheus
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===============================================
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1. Install prometheus:
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Follow instructions at http://prometheus.io/docs/introduction/install/
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2. Enable synapse metrics:
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Simply setting a (local) port number will enable it. Pick a port.
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prometheus itself defaults to 9090, so starting just above that for
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locally monitored services seems reasonable. E.g. 9092:
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Add to homeserver.yaml::
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metrics_port: 9092
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Also ensure that ``enable_metrics`` is set to ``True``.
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Restart synapse.
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3. Add a prometheus target for synapse.
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It needs to set the ``metrics_path`` to a non-default value (under ``scrape_configs``)::
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- job_name: "synapse"
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metrics_path: "/_synapse/metrics"
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static_configs:
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- targets: ["my.server.here:9092"]
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If your prometheus is older than 1.5.2, you will need to replace
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``static_configs`` in the above with ``target_groups``.
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Restart prometheus.
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Deprecated metrics removed in 0.28.0
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------------------------------------
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Synapse 0.28.0 removes all of the metrics deprecated by 0.27.0, which are those
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listed under "Old name" below. This has been done to reduce the bandwidth used
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by gathering metrics and the storage requirements for the Prometheus server, as
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well as reducing CPU overhead for both Synapse and Prometheus.
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Administrators should update any alerts or monitoring dashboards to use the
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"New name" listed below.
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Block and response metrics renamed for 0.27.0
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---------------------------------------------
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Synapse 0.27.0 begins the process of rationalising the duplicate ``*:count``
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metrics reported for the resource tracking for code blocks and HTTP requests.
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At the same time, the corresponding ``*:total`` metrics are being renamed, as
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the ``:total`` suffix no longer makes sense in the absence of a corresponding
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``:count`` metric.
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To enable a graceful migration path, this release just adds new names for the
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metrics being renamed. A future release will remove the old ones.
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The following table shows the new metrics, and the old metrics which they are
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replacing.
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==================================================== ===================================================
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New name Old name
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==================================================== ===================================================
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synapse_util_metrics_block_count synapse_util_metrics_block_timer:count
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synapse_util_metrics_block_count synapse_util_metrics_block_ru_utime:count
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synapse_util_metrics_block_count synapse_util_metrics_block_ru_stime:count
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synapse_util_metrics_block_count synapse_util_metrics_block_db_txn_count:count
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synapse_util_metrics_block_count synapse_util_metrics_block_db_txn_duration:count
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synapse_util_metrics_block_time_seconds synapse_util_metrics_block_timer:total
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synapse_util_metrics_block_ru_utime_seconds synapse_util_metrics_block_ru_utime:total
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synapse_util_metrics_block_ru_stime_seconds synapse_util_metrics_block_ru_stime:total
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synapse_util_metrics_block_db_txn_count synapse_util_metrics_block_db_txn_count:total
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synapse_util_metrics_block_db_txn_duration_seconds synapse_util_metrics_block_db_txn_duration:total
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synapse_http_server_response_count synapse_http_server_requests
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synapse_http_server_response_count synapse_http_server_response_time:count
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synapse_http_server_response_count synapse_http_server_response_ru_utime:count
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synapse_http_server_response_count synapse_http_server_response_ru_stime:count
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synapse_http_server_response_count synapse_http_server_response_db_txn_count:count
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synapse_http_server_response_count synapse_http_server_response_db_txn_duration:count
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synapse_http_server_response_time_seconds synapse_http_server_response_time:total
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synapse_http_server_response_ru_utime_seconds synapse_http_server_response_ru_utime:total
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synapse_http_server_response_ru_stime_seconds synapse_http_server_response_ru_stime:total
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synapse_http_server_response_db_txn_count synapse_http_server_response_db_txn_count:total
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synapse_http_server_response_db_txn_duration_seconds synapse_http_server_response_db_txn_duration:total
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==================================================== ===================================================
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Standard Metric Names
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---------------------
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As of synapse version 0.18.2, the format of the process-wide metrics has been
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changed to fit prometheus standard naming conventions. Additionally the units
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have been changed to seconds, from miliseconds.
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================================== =============================
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New name Old name
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================================== =============================
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process_cpu_user_seconds_total process_resource_utime / 1000
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process_cpu_system_seconds_total process_resource_stime / 1000
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process_open_fds (no 'type' label) process_fds
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================================== =============================
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The python-specific counts of garbage collector performance have been renamed.
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=========================== ======================
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New name Old name
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=========================== ======================
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python_gc_time reactor_gc_time
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python_gc_unreachable_total reactor_gc_unreachable
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python_gc_counts reactor_gc_counts
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=========================== ======================
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The twisted-specific reactor metrics have been renamed.
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==================================== =====================
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New name Old name
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==================================== =====================
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python_twisted_reactor_pending_calls reactor_pending_calls
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python_twisted_reactor_tick_time reactor_tick_time
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==================================== =====================
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