code: func (r *MaxBytesRule) Apply(message *cb.Envelope) error {
  	maxBytes := r.support.BatchSize().AbsoluteMaxBytes
  	if size := messageByteSize(message); size > maxBytes {
  		return fmt.Errorf("message payload is %d bytes and exceeds maximum allowed %d bytes", size, maxBytes)
  	}
  	return nil
  }
docs: // Apply returns an error if the message exceeds the configured absolute max batch size.