private static Method addDescriptions(Method method) {
        return method.methodDesc("get config v3")
                .paramDesc(0, "request", "config request")
                .returnDesc(0, "response", "config response")
                .returnDesc(1, "payload", "config response payload");
    }
Defines methods used for RPC config requests.
config/src/main/java/com/yahoo/vespa/config/JRTMethods.java