private boolean isMetaTableOp(ObserverContext<? extends RegionCoprocessorEnvironment> e) {
      return TableName.META_TABLE_NAME.equals(e.getEnvironment().getRegionInfo().getTable());
    }
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