Document Prometheus metrics for workhorse
Problem to solve
The metrics for workhorse are absent from: https://docs.gitlab.com/ee/administration/monitoring/prometheus/gitlab_metrics.html
Further details
We can see the metrics definitions using this search: https://gitlab.com/search?search=promauto.New&nav_source=navbar&project_id=278964&group_id=9970&search_code=true&repository_ref=master
Proposal
Add a 'Workhorse metrics' section to https://docs.gitlab.com/ee/administration/monitoring/prometheus/gitlab_metrics.html and document all metrics.
Who can address the issue
Workhorse expertise