code: public static Function<Client<HttpRequest, HttpResponse>, HttpTracingClient> newDecorator(
              Tracing tracing,
              @Nullable String remoteServiceName) {
          ensureScopeUsesRequestContext(tracing);
          return delegate -> new HttpTracingClient(delegate, tracing, remoteServiceName);
      }
docs: Creates a new tracing {@link Client} decorator using the specified {@link Tracing} instance
  and remote service name.