m1a2st commented on code in PR #20243:
URL: https://github.com/apache/kafka/pull/20243#discussion_r2239907701


##########
core/src/main/scala/kafka/server/ReplicaManager.scala:
##########
@@ -230,7 +230,9 @@ class ReplicaManager(val config: KafkaConfig,
                      val directoryEventHandler: DirectoryEventHandler = 
DirectoryEventHandler.NOOP,
                      val defaultActionQueue: ActionQueue = new 
DelayedActionQueue
                      ) extends Logging {
-  private val metricsGroup = new KafkaMetricsGroup(this.getClass)
+  private val metricsPackage = "kafka.server"
+  private val metricsClassName = 
this.getClass.getSimpleName.replaceAll("\\$$", "")

Review Comment:
   If `metricsClassName` needs to be determined dynamically, why doesn't 
`metricsPackage` also need to be retrieved dynamically?
   
   Also, since all subclasses are test-only, is it necessary for each one to 
dynamicall determined `metricsClassName`, WDYT?



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