GitLab workhorse, Gitaly, & external exporter Prometheus metric definitions missing from docs

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Problem to solve

Many Prometheus metric definitions (e.g. gitlab_workhorse_http_requests_total) are missing docs. It appears https://docs.gitlab.com/ee/administration/monitoring/prometheus/gitlab_metrics.html only lists GitLab exporter metrics?

Further details

Proposal

• List all GitLab Prometheus metrics with definitions
• For external exporters, link to their docs showing Prometheus metrics with definitions

Who can address the issue

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