def get_interaction_topic_name(app):
    """Get the name of the Kafka topic for Slack interactions.

    Parameters
    ----------
    app : `aiohttp.web.Application` or `dict`
        The application instance or just the configuration from it.

    Returns
    -------
    topic_name : `str`
        The name of the topic. The name is generally::

            sqrbot.interaction
    """
    return app['sqrbot-jr/interactionTopic']