I applied the change in the pull request associated with that Kafka bug, and
unfortunately it didn't resolve anything. It doesn't unregister any
additional MBeans which are created by Kafka's JmxRepository -- it is just a
fix to the remove mbeans from Kafka's cache of mbeans (i.e. it is doing
cleanup within the job's ChildFirst classloader, not the bootstrap/App
classloader where the strong reference exists).
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