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6a78ede569
The existing implementation of the `python_twisted_reactor_tick_time` metric is pretty useless, because it *only* measures the time taken to execute timed calls and callbacks from threads. That neglects everything that happens off the back of I/O, which is obviously quite a lot for us. To improve this, I've hooked into a different place in the reactor - in particular, where it calls `epoll`. That call is the only place it should wait for something to happen - the rest of the loop *should* be quick. I've also removed `python_twisted_reactor_pending_calls`, because I don't believe anyone ever looks at it, and it's a nuisance to populate.
This directory contains some sample monitoring config for using the 'Prometheus' monitoring server against synapse.
To use it, first install prometheus by following the instructions at
for Prometheus v1
Add a new job to the main prometheus.conf file:
job: {
name: "synapse"
target_group: {
target: "http://SERVER.LOCATION.HERE:PORT/_synapse/metrics"
}
}
for Prometheus v2
Add a new job to the main prometheus.yml file:
- job_name: "synapse"
metrics_path: "/_synapse/metrics"
# when endpoint uses https:
scheme: "https"
static_configs:
- targets: ["my.server.here:port"]
An example of a Prometheus configuration with workers can be found in metrics-howto.md.
To use synapse.rules add
rule_files:
- "/PATH/TO/synapse-v2.rules"
Metrics are disabled by default when running synapse; they must be enabled with the 'enable-metrics' option, either in the synapse config file or as a command-line option.