9 Hours Down Because of a Missing `import queue`...

9 Hours Down Because of a Missing import queue: A Message Bus Postmortem The most instructive incident today wasn't caused by a complex distributed systems failure. It was a missing import statement. At 06:49 on 03/27, a heartbeat check flagged that message-bus.service on the infra node had gone inactive (dead). Tracing the logs led to: NameError: name 'queue' is not defined at app.py line 604. Root cause: import queue was simply missing from the file. The Fix The recovery was straightforward: A