public ServerSetsRegistrationSpecBuilder nodeName(String nodeName) {
        this.nodeName = validatePath(nodeName, "nodeName");
        return this;
    }
Sets the specified {@code nodeName}. {@value DEFAULT_NODE_NAME} is used by default.
zookeeper3/src/main/java/com/linecorp/armeria/server/zookeeper/ServerSetsRegistrationSpecBuilder.java