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NameTypeDescription
kafka.controller:type=ControllerEventManager,name=ControllerThreadIdleRatioThreadIdleRatioTimeRatioThe idle ratio measures the proportion of time the controller thread is not actively processing an event over the last 30 secondsusing the existing metric org.apache.kafka.raft.internals.TimeRatio which tracks idleness over the actual measurement interval.

The metric is calculated using the following formula and value ranges from 0 to 1, where 0 indicates the controller thread is constantly processing without breaks, 1 signifies the controller spends most of its time waiting for work:


                      controller idle ratio = idle_time/(active_time+idle_time)


The components are defined as follows:

  • active_time: This is the total time the controller thread actively spends processing events or performing computation work rather than waiting for callbacks or external operations
  • idle_time: This is the total time the controller thread is not executing any instructions while waiting for either new events to appear in the queue or Raft callback. 

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