docs: def _report_container_count(self, containers_by_id):
          """Report container count per state"""
          m_func = FUNC_MAP[GAUGE][self.use_histogram]
  
          per_state_count = defaultdict(int)
  
          filterlambda = lambda ctr: not self._is_container_excluded(ctr)
          containers = list(filter(filterlambda, containers_by_id.values()))
  
          for ctr in containers:
              per_state_count[ctr.get('State', '')] += 1
  
          for state in per_state_count:
              if state:
                  m_func(self, 'docker.container.count', per_state_count[state], tags=['container_state:%s' % state.lower()])