Jie Huang created ZOOKEEPER-3858:
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Summary: Add metrics to track server unavailable time
Key: ZOOKEEPER-3858
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3858
Project: ZooKeeper
Issue Type: Sub-task
Components: metric system
Reporter: Jie Huang
Fix For: 3.6.2
These metrics track the time when a ZooKeeper server is up and running but not
serving client traffic because it is not part of a quorum. They don't track the
hardware down time or ZooKeeper process down time.
UNAVAILABLE_TIME: time between LOOKING and BROADCAST
LEADER_UNAVAILABLE_TIME: time between LOOKING and BROADCAST on the leader
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