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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:
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
Restart synapse
3: check out synapse-prometheus-config
https://github.com/matrix-org/synapse-prometheus-config
4: arrange for synapse.html to appear in prometheus's "consoles"
directory - symlink might be easiest to ensure `git pull` keeps it
updated.
5: arrange for synapse.rules to be invoked from the main
prometheus.conf and add a synapse target. This is easiest if
prometheus runs on the same machine as synapse, as it can then just
use localhost::
global: {
rule_file: "synapse.rules"
}
job: {
name: "synapse"
target_group: {
target: "http://localhost:9092/"
}
}
6: start prometheus::
./prometheus -config.file=prometheus.conf
7: wait a few seconds for it to start and perform the first scrape,
then visit the console:
http://server-where-prometheus-runs:9090/consoles/synapse.html