https://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/wal/MetricsWAL.html
MetricsWAL (Apache HBase 4.0.0-alpha-1-SNAPSHOT API)
declaration: package: org.apache.hadoop.hbase.regionserver.wal, class: MetricsWAL
apache hbasealphasnapshotapi