Geo - Put Geo::MetricsUpdateWorker behind a feature flag
Summary
We've been seeing Geo::MetricsUpdateWorker performance issues with very large tables. So we should probably assume that some issue like that will pop up on GitLab.com due to its scale. We should put it behind a feature flag to stop this worker from running if its queries cause excessive load without blocking all other Geo activities (checksumming).
Edited by Douglas Barbosa Alexandre