KIP-1100 — Rename org.apache.kafka.server:type=AssignmentsManager and org.apache.kafka.storage.internals.log.RemoteStorageThreadPool metrics

Accepted Kafka 4.2 MetricsTiered Storage

Renames the incorrectly prefixed metrics org.apache.kafka.server:type=AssignmentsManager and org.apache.kafka.storage.internals.log:type=RemoteStorageThreadPool back to the canonical kafka.server:type=AssignmentsManager and kafka.log.remote:type=RemoteStorageThreadPool naming convention. A class relocation and a patch introduced non-standard package-based JMX bean prefixes that diverged from Kafka's kafka.COMPONENT convention, breaking monitoring dashboards.

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