Ill be honest i dont understand the removal of this. If theres a bug fix it. But dont remove

@michaelandrepearce, check the commit message for 246bf08 from ARTEMIS-2322. Hopefully that explains the issue.

This is quite a public breaking change though.

A few points...

1. The "rate" was never meant to be user facing. It was designed to be used exclusively for slow-consumer detection (i.e. org.apache.activemq.artemis.core.server.impl.QueueImpl.SlowConsumerReaperRunnable). Calling it from other places can break slow-consumer detection and result in false negatives. I made a mistake by adding getRate() to the org.apache.activemq.artemis.core.server.Queue interface. It should always have been private. I fixed that in this PR.
2. The "rate" was exposed originally on the web console by mistake via ARTEMIS-1349 in 2.3.0. It was likely included in org.apache.activemq.artemis.core.management.impl.view.QueueView because getRate() was on the Queue interface.
3. A corresponding JMX attribute was mistakenly added in 2.10.0 via ARTEMIS-2322 and then removed in 2.16.0 via ARTEMIS-2909. I've heard no complaints since then. I didn't even realize it was exposed on the web console until recently otherwise I would have removed it when I removed the JMX attribute.
4. I think it's unlikely that "rate" is widely used given it was never properly documented and exhibits strange behavior (e.g. consecutive calls to getRate() can return widely varying results unless the rate of production is extremely consistent over time, especially if any other user or system is also polling it).
5. Better alternatives exists as outlined in 246bf08.

fair enough.