@Override
        public String toString() {
            return MoreObjects.toStringHelper(this)
                              .omitNullValues()
                              .add("instanceId", instanceId)
                              .add("ip", ip)
                              .add("port", port)
                              .add("weight", weight)
                              .add("healthy", healthy)
                              .add("enabled", enabled)
                              .add("ephemeral", ephemeral)
                              .add("clusterName", clusterName)
                              .add("serviceName", serviceName)
                              .add("metaData", metadata)
                              .add("instanceHeartBeatInterval", instanceHeartBeatInterval)
                              .add("instanceIdGenerator", instanceIdGenerator)
                              .add("instanceHeartBeatTimeOut", instanceHeartBeatTimeOut)
                              .add("ipDeleteTimeout", ipDeleteTimeout)
                              .toString();
        }
A Nacos client that is responsible for
<a href="https://nacos.io/en-us/docs/v2/guide/user/open-api.html">Nacos Open-Api - Query instances</a>.
nacos/src/main/java/com/linecorp/armeria/internal/nacos/QueryInstancesClient.java