InitialLoggerAspect.java

@Aspect
@Slf4j
public class LoggerAspect {

    @Around("@annotation(Loggable)")
    public Object logAround(ProceedingJoinPoint joinPoint) throws Throwable {

        long start = System.currentTimeMillis();
        var result = joinPoint.proceed();
        if (result instanceof Mono) {
            var monoResult = (Mono) result;
            AtomicReference<String> traceId = new AtomicReference<>("");

            return monoResult
                    .doOnSuccess(o -> {
                        var response = "";
                        if (Objects.nonNull(o)) {
                            response = o.toString();
                        }
                        log.info("Enter: {}.{}() with argument[s] = {}",
                                joinPoint.getSignature().getDeclaringTypeName(), joinPoint.getSignature().getName(),
                                joinPoint.getArgs());
                        log.info("Exit: {}.{}() had arguments = {}, with result = {}, Execution time = {} ms",
                                joinPoint.getSignature().getDeclaringTypeName(), joinPoint.getSignature().getName(),
                                joinPoint.getArgs()[0],
                                response, (System.currentTimeMillis() - start));
                    });
        }
    }
}

Loggable.java

import java.lang.annotation.ElementType;	
import java.lang.annotation.Retention;	
import java.lang.annotation.RetentionPolicy;	
import java.lang.annotation.Target;	

/**	
 * @author Azizul Haque Ananto	
 */	

@Retention(RetentionPolicy.RUNTIME)	
@Target(ElementType.METHOD)	
public @interface Loggable {	
}