def _get_total_services_problems_unhandled(self):
        """Get the number of services that are a problem and that are not acknowledged

        :return: number of problem services which are not acknowledged
        :rtype: int
        """
        return sum(1 for s in self.services if s.is_problem and not s.problem_has_been_acknowledged)
Get the number of services that are a problem and that are not acknowledged

        :return: number of problem services which are not acknowledged
        :rtype: int