private void opMetricRegisterAndMark(Row op) {
      // Mark access type ["get", "put", "delete"] metric
      String opMeterName = opMeterName(op);
      if (opMeterName == null || opMeterName.isEmpty()) {
        return;
      }
      registerAndMarkMeter(opMeterName);
    }
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