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We are also taking this opportunity to address a gap in metrics reporting. Currently we do not have any visibility about the rate of writes to the internal __consumer_offsets topic. With this KIP, there are four cases to distinguish, so we will add one meter for each.

• `kafka.coordinatorserver:type=group-coordinator-metrics,name=offset-commits`: Marked for every committed offset. (Note this is different than the offset commit request rate which only gives visibility at the request level)
• `kafka.coordinatorserver:type=group-coordinator-metrics,name=offset-expirations`: Marked for every expired offset
• `kafka.coordinatorserver:type=group-coordinator-metrics,name=offset-deletions`: Marked for every administrative deletion
• `kafka.coordinatorserver:type=group-coordinator-metrics,name=group-completed-rebalances`: Marked every time a rebalance completes (which causes a group metadata entry to be appended to the log).

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