code: @Deprecated
      public <T> Exception onError(HystrixCommand<T> commandInstance, FailureType failureType, Exception e) {
          // pass-thru by default
          return e;
      }
docs: DEPRECATED: Change usages of this to {@link #onError}.
  
  Invoked after failed completion of {@link HystrixCommand} execution.
  
  @param commandInstance
  The executing HystrixCommand instance.
  @param failureType
  {@link FailureType} representing the type of failure that occurred.
  <p>
  See {@link HystrixRuntimeException} for more information.
  @param e
  Exception thrown by {@link HystrixCommand}
  @return Exception that can be decorated, replaced or just returned as a pass-thru.
  
  @since 1.2