[jira] [Created] (KAFKA-13140) KRaft brokers do not expose kafka.controller metrics, breaking backwards compatibility

["Ron Dagostino (Jira)" <ji...@apache.org>]

Ron Dagostino created KAFKA-13140:
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             Summary: KRaft brokers do not expose kafka.controller metrics, breaking backwards compatibility
                 Key: KAFKA-13140
                 URL: https://issues.apache.org/jira/browse/KAFKA-13140
             Project: Kafka
          Issue Type: Bug
          Components: kraft
    Affects Versions: 2.8.0, 3.0.0
            Reporter: Ron Dagostino
            Assignee: Ron Dagostino
             Fix For: 3.1.0


The following controller metrics are exposed on every broker in a ZooKeeper-based (i.e. non-KRaft) cluster regardless of whether the broker is the active controller or not, but these metrics are not exposed on KRaft nodes that have process.roles=broker (i.e. KRaft nodes that do not implement the controller role).  For backwards compatibility, KRaft nodes that are just brokers should expose these metrics with values all equal to 0: just like ZooKeeper-based brokers do when they are not the active controller.

kafka.controller:type=KafkaController,name=ActiveControllerCount
kafka.controller:type=KafkaController,name=GlobalTopicCount
kafka.controller:type=KafkaController,name=GlobalPartitionCount
kafka.controller:type=KafkaController,name=OfflinePartitionsCount
kafka.controller:type=KafkaController,name=PreferredReplicaImbalanceCount





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