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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