## Problem to solve In https://gitlab.com/gitlab-org/gitlab/-/issues/296874, we update `MergeRequestCleanupRefsWorker` to be a limited capacity worker. For first iteration, it's been set to 4 at a time so we can test. That may be too low though and we may have capacity to have a higher concurrency especially on .com. But at the same time, we also need to think about self-managed installs. ## Proposal Add an application setting that admins can set which will be the `max_running_jobs` of the `MergeRequestCleanupRefsWorker`.