One message makes the consumer fail every time it is processed. What should happen to it?
easy
Options
✗ Retry it forever until it succeeds
✓After a few attempts, move it to a dead-letter queue for inspectionCorrect
✗ Delete it silently
✗ Stop the consumer until someone fixes it
Why
Retrying a "poison" message forever wastes work and, in an ordered queue, blocks everything behind it. A dead-letter queue keeps it safe for a human or a repair job, and an alert on that queue's size tells you it happened.