How to monitor Synapse metrics using Prometheus =============================================== 1. Install prometheus: Follow instructions at http://prometheus.io/docs/introduction/install/ 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: Add to homeserver.yaml:: metrics_port: 9092 Also 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:: - 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``. 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 ==================================== =====================