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Default enable separate metrics for Praefect

Will Chandler requested to merge wc-praefect-separate-metrics into master

What does this MR do?

Praefect's read-only repository metric places significant strain on Postgres in v14.3+ and has caused a number of customer outages. To mitigate this, the praefect['separate_database_metrics'] setting was added, but it is currently disabled by default.

Let's enable this setting by default to help prevent future incidents.

Related issues

gitaly#3796 (closed)

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

  • Merge Request Title, and Description are up to date, accurate, and descriptive
  • MR targeting the appropriate branch
  • MR has a green pipeline on GitLab.com
  • Pipeline is green on the dev.gitlab.org mirror for this branch if the change is touching anything besides documentation or internal cookbooks
  • trigger-package has a green pipeline running against latest commit

Expected (please provide an explanation if not completing)

  • Test plan indicating conditions for success has been posted and passes
  • Documentation created/updated
  • Tests added
  • Integration tests added to GitLab QA
  • Equivalent MR/issue for the GitLab Chart opened
Edited by Jason Plum

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