u/Fragrant_Brush_4161

A common pattern I've seen across teams: a task gets queued, something silently fails on the publishing side, and the debugging session starts with no traces and no clear recovery process.

After running into these issues repeatedly, I mapped out six stages of reliability for Celery/RabbitMQ setups:

1. Best Effort: fire-and-forget, at-most-once delivery, tasks can vanish silently
2. Transactional Boundary: wrapping commands in atomic transactions to prevent out-of-sync data
3. Publishing on Commit: using delay_on_commit so tasks aren't queued before the transaction succeeds
4. Publisher Confirms: getting actual confirmation that the broker received and persisted the message
5. Outbox Pattern: persisting intent to the database first, dispatching later, giving you at-least-once delivery
6. Clusters and Quorum Queues: replication strategies and where classic queues can still lose messages

Full write-up here if useful: https://vladogir.substack.com/p/your-background-tasks-are-silently?r=157avd

Next, I plan to cover the consumer side: idempotency, monitoring and observability.

What do you think I missed?