Add metrics for executor services
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Key: HBASE-4349
URL: https://issues.apache.org/jira/browse/HBASE-4349
Project: HBase
Issue Type: Improvement
Components: metrics
Affects Versions: 0.92.0
Reporter: Todd Lipcon
Would be nice to add some metrics for each of the executor services in the
master and region server:
- number of items in the queue
- age of the oldest yet-unprocessed item (ie in the queue or currently being
handled)
- number of threads in the executor currently busy
These would allow us to monitor better for cases where things get "stuck"
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