New metrics in namenode to capture lost heartbeats.
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Key: HDFS-443
URL: https://issues.apache.org/jira/browse/HDFS-443
Project: HDFS
Issue Type: Improvement
Reporter: Jitendra Nath Pandey
Number of lost heartbeats metrics will count the heartbeats that namenode
didn't receive in a heartbeat interval. This will help operations team to
detect the network issues or bad datanode behaviors early on.
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