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• org.apache.kafka.storage.internals.log:type=RemoteStorageThreadPool.RemoteLogReaderTaskQueueSize
• org.apache.kafka.storage.internals.log:type=RemoteStorageThreadPool.RemoteLogReaderAvgIdlePercent
• org.apache.kafka.server:type=AssignmentsManager.QueuedReplicaToDirAssignments

Introduce following new metric: 

• kafka.log.remote:type=RemoteStorageThreadPool.RemoteLogReaderAvgIdlePercent
• kafka.log.remote:type=RemoteStorageThreadPool.RemoteLogReaderTaskQueueSize
• kafka.server:type=AssignmentsManager.QueuedReplicaToDirAssignments

This change will impact external monitoring systems that rely on the old metric name; corresponding updates will be required.

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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.apache.kafka.storage.internals.log:type=RemoteStorageThreadPool.RemoteLogReaderTaskQueueSize`
   2. `org.apache.kafka.storage.internals.log:type=RemoteStorageThreadPool.RemoteLogReaderAvgIdlePercent`
   3. `org.apache.kafka.server:type=AssignmentsManager`AssignmentsManager.QueuedReplicaToDirAssignments`
3. Register folowing new metrics
   1. `kafka.log.remote:type=RemoteStorageThreadPool.RemoteLogReaderTaskQueueSize`
   2. `kafka.log.remote:type=RemoteStorageThreadPool.RemoteLogReaderAvgIdlePercent`
   3. `kafka.server:type=AssignmentsManager`AssignmentsManager.QueuedReplicaToDirAssignments`
4. Delete following all usage in code base at the next major releaseKafka 5.0
   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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