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Diffstat (limited to 'docs/metrics-howto.rst')
| -rw-r--r-- | docs/metrics-howto.rst | 77 |
1 files changed, 66 insertions, 11 deletions
diff --git a/docs/metrics-howto.rst b/docs/metrics-howto.rst index 8acc479bc3..25e06bca58 100644 --- a/docs/metrics-howto.rst +++ b/docs/metrics-howto.rst @@ -1,25 +1,47 @@ How to monitor Synapse metrics using Prometheus =============================================== -1. Install prometheus: +1. Install Prometheus: Follow instructions at http://prometheus.io/docs/introduction/install/ -2. Enable synapse metrics: +2. Enable Synapse metrics: - Simply setting a (local) port number will enable it. Pick a port. - prometheus itself defaults to 9090, so starting just above that for - locally monitored services seems reasonable. E.g. 9092: + There are two methods of enabling metrics in Synapse. - Add to homeserver.yaml:: + 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:: - metrics_port: 9092 + resources: + - names: + - client + - metrics - Also ensure that ``enable_metrics`` is set to ``True``. + 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. - Restart synapse. + 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 ``/``. -3. Add a prometheus target for synapse. + 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``):: @@ -31,7 +53,40 @@ How to monitor Synapse metrics using Prometheus If your prometheus is older than 1.5.2, you will need to replace ``static_configs`` in the above with ``target_groups``. - Restart prometheus. + 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 |