@classmethod
def get_unhealthy(cls, session, threshold):
    """
        Gets all health scores below a certain value
        :param session the instance of Session used for APIC communication
        :param threshold integer for determining unhealthy objects
        :returns: List of HealthScore objects
        """
    url = (
        '/api/node/class/healthInst.json?query-target-filter=and(lt(healthInst.cur,"{}"))'
        .format(threshold))
    objects = cls._get_by_url(session, url)
    return objects
