Draft: Document some guidelines and tips on Prometheus metrics
What does this MR do and why?
As a developer, it's unclear what Prometheus metrics are available for measurements.
There seems to be some tribal knowledge on how to discover Prometheus metrics from various sources (GitLab Rails, Postgres, GCP, Redis, etc). Such information should be documented in a developer doc.
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I have evaluated the MR acceptance checklist for this MR.
Related to #410287
Edited by Albert