**Prevention of running 2 simultaneous updates**
Instead of using `RemoteMirror#update_status` and raise an error if
it's already running to prevent the same mirror being updated at the
same time we now use `Gitlab::ExclusiveLease` for that.
When we fail to obtain a lease in 3 tries, 30 seconds apart, we bail
and reschedule. We'll reschedule faster for the protected branches.
If the mirror already ran since it was scheduled, the job will be
skipped.
**Error handling: Remote side**
When an update fails because of a `Gitlab::Git::CommandError`, we
won't track this error in sentry, this could be on the remote side:
for example when branches have diverged.
In this case, we'll try 3 times scheduled 1 or 5 minutes apart.
In between, the mirror is marked as "to_retry", the error would be
visible to the user when they visit the settings page.
After 3 tries we'll mark the mirror as failed and notify the user.
We won't track this error in sentry, as it's not likely we can help
it.
The next event that would trigger a new refresh.
**Error handling: our side**
If an unexpected error occurs, we mark the mirror as failed, but we'd
still retry the job based on the regular sidekiq retries with
backoff. Same as we used to
The error would be reported in sentry, since its likely we need to do
something about it.
Remote mirrors only get created when the URL changes, However, during the GCP
migration, the remote mirror did not get created automatically. Plus, there's
no guarantee someone restoring a repository from backup would have this
remote. We now add the remote each time we attempt to fetch from the
repository.
This works because Gitaly doesn't throw up an exception or error if the
remote already exists:
https://gitlab.com/gitlab-org/gitaly/issues/1317
In the future, we should attempt to add if the remote doesn't exist:
https://gitlab.com/gitlab-org/gitaly/issues/1316Closes#50562
GitLab Bot