AB-4007 delivery_unknown
| Class | Delivery |
| HTTP status | 409 |
| Retryable | yes |
When it happens
Ack or nack referenced a delivery_id the gateway no longer holds in flight (gateway restart, ack deadline passed, or already acked). The message redelivers on its own.
Hint
Delivery
{delivery_id}is not in flight. Re-poll the inbox; the message will arrive again with a new delivery_id.
Troubleshooting
- Nothing is lost; redelivery is automatic. 2. If this repeats, the sidecar is acking after the ack deadline; check clock skew and ack promptly after persisting.