backport of custom metrics for the common metrics section of CE
What does this MR do?
Backport of the common metrics from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3799
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug - Review
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Has been reviewed by Frontend
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What are the relevant issue numbers?
Edited by Filipa Lacerda