We encountered an issue during an upgrade to our relay cluster monitoring infrastructure. As a result, we were unable to bring the Mumbai regional cluster up during this maintenance window, and so it was left down. There was no customer impact as any connections were re-routed to another relay cluster.
We determined that the root cause was a configuration error introduced during a deployment configuration upgrade. This was fixed and the cluster was brought back up during a low traffic period at the end of the day.
We identified an issue in our CI/CD process that resulted in the initial misconfiguration, which has been corrected.