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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: Add `synapse.html` and `synapse.rules`
The `.html` file needs to appear in prometheus's "consoles" directory, and
the `.rules` file needs to be invoked somewhere in the main config file.
A symlink to each from the git checkout into the prometheus directory might be
easiest to ensure `git pull` keeps it updated.
5: Add a prometheus target for synapse
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
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