code: @Deprecated
      public <T> T onComplete(HystrixInvokable<T> commandInstance, T response) {
          // pass-thru by default
          return response;
      }
docs: DEPRECATED: Change usages of this to {@link #onEmit} if you want to write a hook that handles each emitted command value
  or to {@link #onSuccess} if you want to write a hook that handles success of the command
  
  Invoked after completion of {@link HystrixCommand} execution that results in a response.
  <p>
  The response can come either from {@link HystrixCommand#run()} or {@link HystrixCommand#getFallback()}.
  
  @param commandInstance
  The executing HystrixCommand instance.
  @param response
  from {@link HystrixCommand#run()} or {@link HystrixCommand#getFallback()}.
  @return T response object that can be modified, decorated, replaced or just returned as a pass-thru.
  
  @since 1.2