private void initHealthChecker() {
        if (healthChecker == null) {
            MetricsCreator metricCreator = manager.find(TelemetryModule.NAME)
                                                  .provider()
                                                  .getService(MetricsCreator.class);
            healthChecker = metricCreator.createHealthCheckerGauge(
                "cluster_k8s", MetricsTag.EMPTY_KEY, MetricsTag.EMPTY_VALUE);
        }
    }
Read collector pod info from api-server of kubernetes, then using all containerIp list to construct the list of
{@link RemoteInstance}.
oap-server/server-cluster-plugin/cluster-kubernetes-plugin/src/main/java/org/apache/skywalking/oap/server/cluster/plugin/kubernetes/KubernetesCoordinator.java