def send_custom_host_notification(self, host, options, author, comment):
        """DOES NOTHING (Should send a custom notification)
        Format of the line that triggers function call::

        SEND_CUSTOM_HOST_NOTIFICATION;<host_name>;<options>;<author>;<comment>

        :param host: host to send notif for
        :type host: alignak.object.host.Host
        :param options: notification options
        :type options:
        :param author: notification author
        :type author: str
        :param comment: notification text
        :type comment: str
        :return: None
        """
        logger.warning("The external command 'SEND_CUSTOM_HOST_NOTIFICATION' "
                       "is not currently implemented in Alignak. If you really need it, "
                       "request for its implementation in the project repository: "
                       "https://github.com/Alignak-monitoring/alignak")
        self.send_an_element(make_monitoring_log(
            'warning', 'SEND_CUSTOM_HOST_NOTIFICATION: this command is not implemented!'))
DOES NOTHING (Should send a custom notification)
        Format of the line that triggers function call::

        SEND_CUSTOM_HOST_NOTIFICATION;<host_name>;<options>;<author>;<comment>

        :param host: host to send notif for
        :type host: alignak.object.host.Host
        :param options: notification options
        :type options:
        :param author: notification author
        :type author: str
        :param comment: notification text
        :type comment: str
        :return: None