https://hbase.apache.org/2.5/devapidocs/org/apache/hadoop/metrics2/package-summary.html
org.apache.hadoop.metrics2 (Apache HBase 2.5.0 API)
apache hadoophbaseapi
https://hbase.apache.org/2.3/devapidocs/org/apache/hadoop/metrics2/util/package-summary.html
org.apache.hadoop.metrics2.util (Apache HBase 2.3.0 API)
apache hadooputilhbaseapi