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These changes went unnoticed, and subsequent users began using the new org.apache.kafka.<COMPONENT> pattern, diverging from the established convention.

This KIP proposes to standardize Kafka metric naming by reverting the following metrics to the correct kafka.<COMPONENT> format to ensure consistency across the system:

• org.apache.kafka.server:type=AssignmentsManager → kafka.server:type=AssignmentsManager

• org.apache.kafka.storage.internals.log:type=RemoteStorageThreadPool → kafka.log.remote:type=RemoteStorageThreadPool

This change will align these metrics with the broader Kafka metrics ecosystem and avoid confusion for users and tooling that rely on consistent naming.

Public Interface

• org.apache.kafka.storage.internals.log.RemoteStorageThreadPool 
• org.apache.kafka.server.log.remote.storage.RemoteStorageMetrics 

• org.apache.kafka.server.AssignmentsManager

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1. We will add a deprecated annotation on following constant
   1. `RemoteStorageMetrics#REMOTE_LOG_READER_TASK_QUEUE_SIZE_METRIC`
   2. `RemoteStorageMetrics#REMOTE_LOG_READER_AVG_IDLE_PERCENT_METRIC`
   3. `AssignmentsManager#QUEUED_REPLICA_TO_DIR_ASSIGNMENTS_METRIC`
2. Update the Kafka documentation to note MBean will be replaced
   1. org`org.apache.kafka.storage.internals.log:type=RemoteStorageThreadPool.RemoteLogReaderTaskQueueSizeRemoteLogReaderTaskQueueSize`org
   2. `org.apache.kafka.storage.internals.log:type=RemoteStorageThreadPool.RemoteLogReaderAvgIdlePercentRemoteLogReaderAvgIdlePercent`
   3. `org.apache.kafka.server:type=AssignmentsManager`
3. Register foloowing folowing new metrics
   1. `kafka.log.remote:type=RemoteStorageThreadPool.RemoteLogReaderTaskQueueSize`
   2. `kafka.log.remote:type=RemoteStorageThreadPool.RemoteLogReaderAvgIdlePercent`
   3. `kafka.server:type=AssignmentsManager`
4. Delete following all usage in code base .at the next major release
   1. `RemoteStorageMetrics#REMOTE_LOG_READER_TASK_QUEUE_SIZE_METRIC`
   2. `RemoteStorageMetrics#REMOTE_LOG_READER_AVG_IDLE_PERCENT_METRIC`
   3. `AssignmentsManager#QUEUED_REPLICA_TO_DIR_ASSIGNMENTS_METRIC`

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