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Reduce the number of series for rails_request SLIs

Bob Van Landuyt requested to merge bvl/avoid-initializing-slis-for-unused-endpoints into master

Reduce the number of series for rails_request SLIs

This removes 1960 series in total for the following metrics:

  • gitlab_sli_rails_request_total
  • gitlab_sli_rails_request_error_total
  • gitlab_sli_rails_request_apdex_total
  • gitlab_sli_rails_request_apdex_success_total

We do this by not initializing the metrics for endpoints that haven't been used on GitLab.com in a month.

These endpoints include a bunch of admin endpoints, but also endpoints that aren't actually reachable.

This was discussed in gitlab-org/quality/engineering-productivity/master-broken-incidents#7229 (comment 1992920196)

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