The Failure Mode Your Runbook Probably Does Not Cover
Operations teams rehearse plenty of scenarios. Failed deployments, database corruption, certificate expiry, a region going dark, the on-call engineer who cannot be reached. What gets rehearsed far less often is the building losing power for eleven hours, because that feels like somebody else's problem, filed under facilities alongside the air conditioning and the parking barrier. It stops being somebody else's problem at the moment the UPS batteries drain and everything still running on premises goes down at once.