@Override
    public String toString() {
        return MoreObjects.toStringHelper(this)
                          .add("registryFetchIntervalMillis", registryFetchIntervalMillis)
                          .toString();
    }
Returns a newly-created {@link NacosEndpointGroupBuilder} with the specified {@code nacosUri}
and {@code serviceName} to build {@link NacosEndpointGroupBuilder}.

@param nacosUri the URI of Nacos API service, including the path up to but not including API version.
                (example: http://localhost:8848/nacos)
nacos/src/main/java/com/linecorp/armeria/client/nacos/NacosEndpointGroup.java