def is_excluded(self, cid, pod_uid=None):
        """
        Queries the agent6 container filter interface. It retrieves container
        name + image from the podlist, so static pod filtering is not supported.

        Result is cached between calls to avoid the python-go switching cost for
        prometheus metrics (will be called once per metric)
        :param cid: container id
        :param pod_uid: pod UID for static pod detection
        :return: bool
        """
        if not cid:
            return True

        if cid in self.cache:
            return self.cache[cid]

        if pod_uid and pod_uid in self.static_pod_uids:
            self.cache[cid] = False
            return False

        if cid not in self.containers:
            # Filter out metrics not coming from a container (system slices)
            self.cache[cid] = True
            return True
        ctr = self.containers[cid]
        if not ("name" in ctr and "image" in ctr):
            # Filter out invalid containers
            self.cache[cid] = True
            return True

        excluded = is_excluded(ctr.get("name"), ctr.get("image"))
        self.cache[cid] = excluded
        return excluded