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- How to monitor Synapse metrics using Prometheus
- ===============================================
- 1. Install Prometheus:
- Follow instructions at http://prometheus.io/docs/introduction/install/
- 2. Enable Synapse metrics:
- There are two methods of enabling metrics in Synapse.
- The first serves the metrics as a part of the usual web server and can be
- enabled by adding the "metrics" resource to the existing listener as such::
- resources:
- - names:
- - client
- - metrics
- This provides a simple way of adding metrics to your Synapse installation,
- and serves under ``/_synapse/metrics``. 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.
- 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 ``/``.
- Add a new listener to homeserver.yaml::
- listeners:
- - type: metrics
- port: 9000
- bind_addresses:
- - '0.0.0.0'
- For both options, you will need to ensure that ``enable_metrics`` is set to
- ``True``.
- Restart Synapse.
- 3. Add a Prometheus target for Synapse.
- It needs to set the ``metrics_path`` to a non-default value (under ``scrape_configs``)::
- - job_name: "synapse"
- metrics_path: "/_synapse/metrics"
- static_configs:
- - targets: ["my.server.here:9092"]
- If your prometheus is older than 1.5.2, you will need to replace
- ``static_configs`` in the above with ``target_groups``.
- Restart Prometheus.
- Removal of deprecated metrics & time based counters becoming histograms in 0.31.0
- ---------------------------------------------------------------------------------
- The duplicated metrics deprecated in Synapse 0.27.0 have been removed.
- All time duration-based metrics have been changed to be seconds. This affects:
- ================================
- msec -> sec metrics
- ================================
- python_gc_time
- python_twisted_reactor_tick_time
- synapse_storage_query_time
- synapse_storage_schedule_time
- synapse_storage_transaction_time
- ================================
- Several metrics have been changed to be histograms, which sort entries into
- buckets and allow better analysis. The following metrics are now histograms:
- =========================================
- Altered metrics
- =========================================
- python_gc_time
- python_twisted_reactor_pending_calls
- python_twisted_reactor_tick_time
- synapse_http_server_response_time_seconds
- synapse_storage_query_time
- synapse_storage_schedule_time
- synapse_storage_transaction_time
- =========================================
- Block and response metrics renamed for 0.27.0
- ---------------------------------------------
- Synapse 0.27.0 begins the process of rationalising the duplicate ``*:count``
- metrics reported for the resource tracking for code blocks and HTTP requests.
- At the same time, the corresponding ``*:total`` metrics are being renamed, as
- the ``:total`` suffix no longer makes sense in the absence of a corresponding
- ``:count`` metric.
- 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.
- The following table shows the new metrics, and the old metrics which they are
- replacing.
- ==================================================== ===================================================
- New name Old name
- ==================================================== ===================================================
- synapse_util_metrics_block_count synapse_util_metrics_block_timer:count
- synapse_util_metrics_block_count synapse_util_metrics_block_ru_utime:count
- synapse_util_metrics_block_count synapse_util_metrics_block_ru_stime:count
- synapse_util_metrics_block_count synapse_util_metrics_block_db_txn_count:count
- synapse_util_metrics_block_count synapse_util_metrics_block_db_txn_duration:count
- synapse_util_metrics_block_time_seconds synapse_util_metrics_block_timer:total
- synapse_util_metrics_block_ru_utime_seconds synapse_util_metrics_block_ru_utime:total
- synapse_util_metrics_block_ru_stime_seconds synapse_util_metrics_block_ru_stime:total
- synapse_util_metrics_block_db_txn_count synapse_util_metrics_block_db_txn_count:total
- synapse_util_metrics_block_db_txn_duration_seconds synapse_util_metrics_block_db_txn_duration:total
- synapse_http_server_response_count synapse_http_server_requests
- synapse_http_server_response_count synapse_http_server_response_time:count
- synapse_http_server_response_count synapse_http_server_response_ru_utime:count
- synapse_http_server_response_count synapse_http_server_response_ru_stime:count
- synapse_http_server_response_count synapse_http_server_response_db_txn_count:count
- synapse_http_server_response_count synapse_http_server_response_db_txn_duration:count
- synapse_http_server_response_time_seconds synapse_http_server_response_time:total
- synapse_http_server_response_ru_utime_seconds synapse_http_server_response_ru_utime:total
- synapse_http_server_response_ru_stime_seconds synapse_http_server_response_ru_stime:total
- synapse_http_server_response_db_txn_count synapse_http_server_response_db_txn_count:total
- synapse_http_server_response_db_txn_duration_seconds synapse_http_server_response_db_txn_duration:total
- ==================================================== ===================================================
- Standard Metric Names
- ---------------------
- 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 miliseconds.
- ================================== =============================
- New name Old name
- ================================== =============================
- process_cpu_user_seconds_total process_resource_utime / 1000
- process_cpu_system_seconds_total process_resource_stime / 1000
- process_open_fds (no 'type' label) process_fds
- ================================== =============================
- The python-specific counts of garbage collector performance have been renamed.
- =========================== ======================
- New name Old name
- =========================== ======================
- python_gc_time reactor_gc_time
- python_gc_unreachable_total reactor_gc_unreachable
- python_gc_counts reactor_gc_counts
- =========================== ======================
- The twisted-specific reactor metrics have been renamed.
- ==================================== =====================
- New name Old name
- ==================================== =====================
- python_twisted_reactor_pending_calls reactor_pending_calls
- python_twisted_reactor_tick_time reactor_tick_time
- ==================================== =====================
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