Firebolt change history: Engines may fail to start and stop

Firebolt reported a major incident affecting engine starts and stops from 2022-01-26 13:02 UTC to 2022-01-26 16:48 UTC (3 h 45 min). Ingestion on impacted engines may also have been affected. Firebolt reported a master-cluster outage that disrupted internal services; a fix was deployed and tested before resolution.