code: public static WatchedUpdateResult createIncremental(Map<String, Object> added, Map<String, Object> changed,
              Map<String, Object> deleted) {
          return new WatchedUpdateResult(added, changed, deleted);
      }
docs: Create a result that represents incremental changes from the configuration source.
  
  @param added
  properties added
  @param changed
  properties changed
  @param deleted
  properties deleted, in which case the value in the map will be ignored