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Vote thread: here

Discussion thread: here 

JIRA: KAFKA-19467 

Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).

Motivation

The controller thread is responsible for critical cluster coordination tasks, including leadership elections, topic metadata updates, partition assignments, and Raft-based state changes. However, there is currently no metric to measure how much time the controller spends actively processing work versus waiting for new events or Raft callbacks. This KIP proposes introducing a new metric to monitor the controller thread’s idleness ratio.

Public Interfaces

Monitoring

NameTypeDescription
kafka.controller:type=KafkaController,name=ControllerThreadIdleRatioGaugeThe ratio of time the controller thread is idle to the time controller  compared to the total time. Values range from 0 to 1, where 0 indicates the thread is fully busy and 1 indicates it is completely idle.

Compatibility, Deprecation, and Migration Plan

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