code: @Deprecated
      public static <I extends Request, O extends Response>
      Function<Service<I, O>, LoggingService<I, O>> newDecorator(LogLevel level) {
          return delegate -> new LoggingService<>(delegate, level);
      }
docs: Returns a new {@link Service} decorator that logs {@link Request}s and {@link Response}s at the given
  {@link LogLevel}.
  
  @deprecated Use {@link LoggingServiceBuilder}.