private static void warnIfInactivePort(Server server, int port) {
        for (ServerPort serverPort : server.activePorts().values()) {
            if (serverPort.localAddress().getPort() == port) {
                return;
            }
        }
        logger.warn("The specified port number {} does not exist. (expected one of activePorts: {})",
                    port, server.activePorts());
    }
Returns a newly-created {@link NacosUpdatingListenerBuilder} with the specified {@code nacosUri}
and {@code serviceName} to build {@link NacosUpdatingListener}.

@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/server/nacos/NacosUpdatingListener.java