private String regionMeterName(String regionId) {
      // Extract meter name containing the region ID
      return String.format("MetaTable_region_%s_lossy_request", regionId);
    }
Get regionId from Ops such as: get, put, delete.
@param op such as get, put or delete.
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/MetaTableMetrics.java