Close change history: App UI unavailable

Close’s critical Application UI incident ran from 2025-01-06 17:49 UTC to 2025-01-06 19:47 UTC (1 h 58 min). The postmortem reports Web UI unavailability from 2025-01-06 17:33 UTC to 2025-01-06 17:48 UTC (15 minutes). Close cited a deployment-process change and said the issue was reverted.