Add metrics to HRegion.processRow()
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Key: HBASE-5544
URL: https://issues.apache.org/jira/browse/HBASE-5544
Project: HBase
Issue Type: New Feature
Reporter: Scott Chen
Assignee: Scott Chen
Add metrics of
1. time for waiting for the lock
2. processing time (scan time)
3. time spent while holding the lock
4. total call time
5. number of failures / calls
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