code: private void updateMetric(String value, GroupSetEntry groupSetEntry, Set<String>[] groupKeys){
  		updateMetric(value, groupSetEntry.m_totalGroup, groupKeys, 0);
  		if (groupSetEntry.m_isComposite){
  			updateMetric(value, groupSetEntry.m_compositeGroup, groupKeys, groupKeys.length - 1);
  		}
  	}
docs: add value to the aggregation groups