code: private static <K, N, S> int countMappingsInKeyGroup(final Map<N, Map<K, S>> keyGroupMap) {
  		int count = 0;
  		for (Map<K, S> namespaceMap : keyGroupMap.values()) {
  			count += namespaceMap.size();
  		}
  
  		return count;
  	}
docs: snapshots ---------------------------------------------------------------------------------------------------