example3.java

@RestController
public class Example3Controller {
    private static final Logger log = LoggerFactory.getLogger(Example3Controller.class);

    @GetMapping("/example3")
    public Mono<String> example3() {
        return doSomeStuff();
    }

    private Mono<String> doSomeStuff() {
        return
            Mono.just("Some data")
                .doOnEach(LogHelper.info(log, "Still have request id"))
            ;
    }
}