def METHOD_NAME(self, level, message):
    """
    Adds a message to the queue of messages waiting to be pushed back to the controller process.
    :arg level: A string which can either be the name of a method in display, or 'log'. When
        the messages are returned to task_executor, a value of log will correspond to
        ``display.display(message, log_only=True)``, while another value will call ``display.[level](message)``
    """
    self._messages.append((level, message))