Clarify docs about configuring Sentry metrics

[yayapao]

Environment

self-hosted (https://develop.sentry.dev/self-hosted/)

Version

21.6.3

Steps to Reproduce

When i study sentry source code, i found it use metric.timing and metric.incr somewhere, i wonder how to get close to these metrics?

Metrics like:

metrics.timing(
      "events.synthetic-monitoring.time-to-ingest-total",
      now - data["timestamp"],
      tags=tags,
      sample_rate=1.0,
  )

And i found relay can start a server to get these metrics, like metrics and collected metrics

Have a great day, bro.

Expected Result

A way to get metrics value which was collected by sentry.

Actual Result

No doc indicates i can do this.

[getsentry-release]

Routing to @getsentry/open-source for triage. ⏲️

[markstory]

You need to configure a metrics backend with settings.SENTRY_METRICS_BACKEND. There are adapters in the code base for statsd + datadog.

[imatwawana]

@markstory - Is there an update here that needs to be made to in docs.sentry.io or develop.sentry.dev?

[github-actions[bot]]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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[markstory]

@imatwawana I don't think so. The internal metrics backend isn't something we generally expect self-hosted users to use or need to configure.