docs: def _get_container_id(self, labels):
          """
          Should only be called on a container-scoped metric
          It gets the container id from the podlist using the metrics labels
  
          :param labels
          :return str or None
          """
          namespace = CadvisorPrometheusScraperMixin._get_container_label(labels, "namespace")
          pod_name = CadvisorPrometheusScraperMixin._get_container_label(labels, "pod_name")
          container_name = CadvisorPrometheusScraperMixin._get_container_label(labels, "container_name")
          return self.pod_list_utils.get_cid_by_name_tuple((namespace, pod_name, container_name))