طوابير الرسائل الميتة وإعادة المحاولة المؤجلة

في هذا الدرس

isolate poison messages and retry with a delay.

الموضوعات المخطط لها

• A dead-letter exchange (DLX) receives messages that are rejected without requeue, expire (TTL), or overflow a queue.
• Set x-dead-letter-exchange (and optionally x-dead-letter-routing-key) as queue arguments.
• Delayed retry pattern: failed message goes to a wait queue with a TTL whose dead-letter target is the main exchange; it returns after the delay.
• Count retries (header x-death or your own) and park the message in a final DLQ after N attempts.
• A delayed-message plugin exists; verify availability and support status before recording.
• Alert on DLQ depth and make replay a deliberate action.