Observing of a remote Git repository broke because of boring ssh key related reasons at the remote end, but it took me a while to notice.
Browsing to /source/…/manage/status/ makes it obvious that there’s an error, with a little red warning triangle, but if you don’t happen to visit this page then it’s not clear that your repository replica is quietly going out of date.
Perhaps there could be some kind of alert for admins that something is broken, similar to the setup errors that they see? Perhaps people could chose to subscribe to alerts via Herald? Perhaps this should only trigger if mirroring has been failing for a certain period of time?
This likely overlaps somewhat with T6131.