Provide queue name and reason to publisher for rejected messages #15075
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## What? 1. This commit adds the name of the queue that rejected a message as well as the reason why the message was rejected in the Rejected outcome for AMQP 1.0. 2. For MQTT 5.0 publishers, the reason is provided in the PUBACK packet. ## Why? It may be helpful for publishers to know which queue out of multilple target queues rejected the message. One such use case is described in #1443 It may also be helpful to know for publishers whether the given target queue rejected the message because its maximum queue length was reached or because the target queue happens to be unavailable. ## How? RabbitMQ will include the UTF-8 encoded queue name (rather than an AMQP address) as well as the reason in the `info` field of the Rejected outcome's `error` field: * `queue: <queue name>` * `reason: maxlen | unavailable` For MQTT 5.0, if the queue length limit is exceeded, RabbitMQ will return the reason code for `Quota exceeded` to the publisher.
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What?
Why?
It may be helpful for publishers to know which queue out of multilple target queues rejected the message. One such use case is described in #1443 It may also be helpful to know for publishers whether the given target queue rejected the message because its maximum queue length was reached or because the target queue happens to be unavailable.
How?
RabbitMQ will include the UTF-8 encoded queue name (rather than an AMQP address) as well as the reason in the
infofield of the Rejected outcome'serrorfield:queue: <queue name>reason: maxlen | unavailableFor MQTT 5.0, if the queue length limit is exceeded, RabbitMQ will return the reason code for
Quota exceededto the publisher.