public static Function<? super HttpService, BraveService>
    newDecorator(Tracing tracing) {
        return newDecorator(HttpTracing.newBuilder(tracing)
                                       .serverRequestParser(defaultRequestParser)
                                       .serverResponseParser(defaultResponseParser)
                                       .build());
    }
Creates a new tracing {@link HttpService} decorator using the specified {@link Tracing} instance.
brave/brave6/src/main/java/com/linecorp/armeria/server/brave/BraveService.java