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The behavior of which nodes expose controller metrics will be different in KRaft clusters than the behavior when using Kafka with Zookeeper. KRaft nodes will only expose the controller metrics if the node is a process has the "controller" processrole. If a KRaft node is a has the "controller" process role but is not the active controller, it will expose 0 for all controller metrics since the process is eligible to become the active controller. This is consistent with behavior for controller-eligible nodes in a Kafka cluster using Zookeeper.

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