def METHOD_NAME(**kwargs):
    """
    .. versionadded:: 2016.3.4
    Dummy function used only to print a message that upgrade is not available.
    The reason is that upgrade needs manual intervention and reboot, so even if
    used with:
       yes | freebsd-upgrade -r VERSION
    the additional freebsd-update install that needs to run after the reboot
    cannot be implemented easily.
    kwargs:
        Parameters of freebsd-update command.
    """
    msg = "freebsd-update upgrade not yet implemented."
    log.warning(msg)
    return msg