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[consensus] Add consensus op-level lag metrics
It may be useful to see how far behind the leaders each follower is with regard to replicating operations. As such, this patch adds a metric facilitate this. The new metric counts the number of operations behind the leader each peer is. It is updated when a follower receives a request from a leader, and after the peer message queue appends operations. Change-Id: Ida8e992cc2397ca8d5873e62961a65f618d52c36 Reviewed-on: http://gerrit.cloudera.org:8080/6451 Reviewed-by: Mike Percy <[email protected]> Tested-by: Kudu Jenkins
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