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feat: expose agent metrics via Prometheus endpoint (#7011)

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* WIP

* WIP

* WIP

* Agents

* fix

* 1min

* fix

* WIP

* Test

* docs

* fmt

* Add timer to measure the metrics collection

* Use CachedGaugeVec

* Unit tests

* Address PR comments
This commit is contained in:
Marcin Tojek
2023-04-07 17:48:52 +02:00
committed by GitHub
parent dd85ea8977
commit 0347231bb8
7 changed files with 629 additions and 48 deletions
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9
cli/server.go
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@ -896,6 +896,15 @@ func (r *RootCmd) Server(newAPI func(context.Context, *coderd.Options) (*coderd.
return xerrors.Errorf("create coder API: %w", err)
}
if cfg.Prometheus.Enable {
// Agent metrics require reference to the tailnet coordinator, so must be initiated after Coder API.
closeAgentsFunc, err := prometheusmetrics.Agents(ctx, logger, options.PrometheusRegistry, coderAPI.Database, &coderAPI.TailnetCoordinator, options.DERPMap, coderAPI.Options.AgentInactiveDisconnectTimeout, 0)
if err != nil {
return xerrors.Errorf("register agents prometheus metric: %w", err)
}
defer closeAgentsFunc()
}
client := codersdk.New(localURL)
if localURL.Scheme == "https" && isLocalhost(localURL.Hostname()) {
// The certificate will likely be self-signed or for a different