def METHOD_NAME(self, *args, **kwargs):
    """
    Post Matrix Message
    Post a message to a room in Matrix. Optionally includes formatted message.
    The `roomId` in the scopes is a fully formed `roomId` with leading `!` such
    as `!foo:bar.com`.
    Note that the matrix client used by taskcluster must be invited to a room before
    it can post there!
    This method is ``experimental``
    """
    return self._makeApiCall(self.funcinfo["matrix"], *args, **kwargs)