"Run housekeeping" button often does nothing
There is a button in the "advanced" section of the project settings called "Run housekeeping" which should trigger Git garbage collection on the project's repository.
In https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/6960#note_181267414 we discovered that this button often does nothing because it looks at the value of the "pushes since GC" counter, which is not the expected behavior.