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feat: add prometheus observability metrics for dbpurge (#21074)

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Related to
[`internal#1139`](https://github.com/coder/internal/issues/1139)

This implements some prometheus metrics for records being removed from
the database. Currently we're tracking the following fields being
removed from the DB by this. They're viewable in the
`/api/v2/debug/metrics` endpoint.

* `expired_api_keys`
* `aibridge_records`
* `connection_logs`
* `duration`

```
# HELP coderd_dbpurge_iteration_duration_seconds Duration of each dbpurge iteration in seconds.
# TYPE coderd_dbpurge_iteration_duration_seconds histogram
coderd_dbpurge_iteration_duration_seconds_bucket{success="true",le="1"} 1
coderd_dbpurge_iteration_duration_seconds_bucket{success="true",le="5"} 1
coderd_dbpurge_iteration_duration_seconds_bucket{success="true",le="10"} 1
coderd_dbpurge_iteration_duration_seconds_bucket{success="true",le="30"} 1
coderd_dbpurge_iteration_duration_seconds_bucket{success="true",le="60"} 1
coderd_dbpurge_iteration_duration_seconds_bucket{success="true",le="300"} 1
coderd_dbpurge_iteration_duration_seconds_bucket{success="true",le="600"} 1
coderd_dbpurge_iteration_duration_seconds_bucket{success="true",le="+Inf"} 1
coderd_dbpurge_iteration_duration_seconds_sum{success="true"} 0.014787814
coderd_dbpurge_iteration_duration_seconds_count{success="true"} 1
# HELP coderd_dbpurge_records_purged_total Total number of records purged by type.
# TYPE coderd_dbpurge_records_purged_total counter
coderd_dbpurge_records_purged_total{record_type="aibridge_records"} 0
coderd_dbpurge_records_purged_total{record_type="audit_logs"} 0
coderd_dbpurge_records_purged_total{record_type="connection_logs"} 0
coderd_dbpurge_records_purged_total{record_type="expired_api_keys"} 0
coderd_dbpurge_records_purged_total{record_type="workspace_agent_logs"} 0
```

| Position | Pull-request |
| -------- | ------------ |
| ✅ | [feat: add prometheus observability metrics for
`dbpurge`](https://github.com/coder/coder/pull/21074) |
| | [feat: add rbac specificity for
`dbpurge`](https://github.com/coder/coder/pull/21088) |
This commit is contained in:
Jake Howell
2025-12-20 00:20:57 +11:00
committed by GitHub
parent 5b3c24c02f
commit 00793cc0b5
3 changed files with 154 additions and 15 deletions
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cli/server.go
+1 -1
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@@ -1038,7 +1038,7 @@ func (r *RootCmd) Server(newAPI func(context.Context, *coderd.Options) (*coderd.
defer shutdownConns()
// Ensures that old database entries are cleaned up over time!
purger := dbpurge.New(ctx, logger.Named("dbpurge"), options.Database, options.DeploymentValues, quartz.NewReal())
purger := dbpurge.New(ctx, logger.Named("dbpurge"), options.Database, options.DeploymentValues, quartz.NewReal(), options.PrometheusRegistry)
defer purger.Close()
// Updates workspace usage