@Override
            public void onClose(WatcherException cause) {
                if (closed) {
                    return;
                }
                logger.warn("[{}/{}] Node watcher is closed.", namespace, serviceName, cause);
                scheduleRestartWithBackoff(++numNodeFailures);
            }
Fetches the internal IPs of the node.
kubernetes/src/main/java/com/linecorp/armeria/client/kubernetes/endpoints/KubernetesEndpointGroup.java