We will add the following metrics:

Metric Name	Mbean Name	Description
`time-between-poll-avg`	`kafka.consumer:type=consumer-metrics,client-id=([-.\w]+)`	The average delay between invocations of poll().
`time-between-poll-max`	`kafka.consumer:type=consumer-metrics,client-id=([-.\w]+)`	The max delay between invocations of poll().
`poll-idle-ratio`	`kafka.consumer:type=consumer-metrics,client-id=([-.\w]+)`	The fraction of time the consumer spent waiting for the user to process records from poll.

Proposed Changes

time-between-poll (avg/max)

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