code: def _tot_unhandled_services_by_state(self, state):
          
          return sum(1 for s in self.services if s.state == state and
                     s.is_problem and not s.problem_has_been_acknowledged)
docs: Generic function to get the number of unhandled problem services in the specified state
  
          :param state: state to filter on
          :type state:
          :return: number of service in state *state* and which are not acknowledged problems
          :rtype: int