Add praefect prometheus_exclude_database_from_default_metrics config value

What does this MR do?

Praefect has a new configuration value to control whether or not it will hit the database for metrics. This change adds the prometheus_exclude_database_from_default_metrics config value and writes it into the right place in the praefect config toml.

corresponding gitaly MR is gitaly!4085 (merged)

Related issues

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 dev.gitlab.org 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

added devopssystems groupdistribution sectioncore platform labels

gitaly!4085 (merged) is still in progress and needs to be reviewed/merged. But, this is high priority so would be great to have it reviewed in parallel.

assigned to @jcaigitlab

added 9 commits

• cb9550bb...d313af57 - 8 commits from branch master
• 35d37fd9 - Add praefect prometheus_exclude_database_from_default_metrics config value

Compare with previous version

mentioned in merge request gitaly!4085 (merged)

added workflowready for review label

/cc @timzallmann

changed milestone to %14.5

The Trigger:ee-package job from pipeline https://gitlab.com/gitlab-org/omnibus-gitlab/-/pipelines/410909082 triggered https://gitlab.com/gitlab-org/build/omnibus-gitlab-mirror/-/pipelines/411026180 downstream.

The qa-test job from pipeline https://gitlab.com/gitlab-org/build/omnibus-gitlab-mirror/-/pipelines/411026180 triggered https://gitlab.com/gitlab-org/gitlab-qa-mirror/-/pipelines/411048706 downstream.

The gitlab-qa downstream pipeline failed! .

The qa failures appear unrelated to this MR, as they are also happening in master but the main failures are for gitaly-cluster tests: https://gitlab.com/gitlab-org/gitlab-qa-mirror/-/jobs/1793870306 so not all the qa validation is working here

Thanks a lot @twk3 + team helping us on moving it forward.

added featureaddition label

removed featureaddition label

added featureenhancement label

added typefeature label

requested review from @twk3

added workflowin review label and removed workflowready for review label

Visually this looks good, I'm just doing some manual validation of the change now