## Context Repository mirroring is widely used, most popularly from a canonical repo to a security mirror. Many infrastructure operations function on security mirrors, so we need them to be in sync all the time. However, the mirroring can fail because of various reasons: diverge ref, expired token, permission, etc. They often fail silently, and we don't know about that until an engineer investigates. ## Proposal * Send a Slack notification when detecting a failed mirror ### Open questions * Who is the owner of a mirroring setup? Delivery team, or the stage team * Notification medium?