oap-server/server-cluster-plugin/cluster-etcd-plugin/src/main/java/org/apache/skywalking/oap/server/cluster/plugin/etcd/EtcdCoordinator.java [193:201]:
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    private void initHealthChecker() {
        if (healthChecker == null) {
            MetricsCreator metricCreator = manager.find(TelemetryModule.NAME)
                                                  .provider()
                                                  .getService(MetricsCreator.class);
            healthChecker = metricCreator.createHealthCheckerGauge(
                "cluster_etcd", MetricsTag.EMPTY_KEY, MetricsTag.EMPTY_VALUE);
        }
    }
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oap-server/server-cluster-plugin/cluster-consul-plugin/src/main/java/org/apache/skywalking/oap/server/cluster/plugin/consul/ConsulCoordinator.java [136:144]:
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    private void initHealthChecker() {
        if (healthChecker == null) {
            MetricsCreator metricCreator = manager.find(TelemetryModule.NAME)
                                                  .provider()
                                                  .getService(MetricsCreator.class);
            healthChecker = metricCreator.createHealthCheckerGauge(
                "cluster_consul", MetricsTag.EMPTY_KEY, MetricsTag.EMPTY_VALUE);
        }
    }
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oap-server/server-cluster-plugin/cluster-kubernetes-plugin/src/main/java/org/apache/skywalking/oap/server/cluster/plugin/kubernetes/KubernetesCoordinator.java [120:128]:
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    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);
        }
    }
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