Reactor logging in spring

Question

I have a spring boot application with logging via org.slf4j.Logger and I have a Mono as seen below in a class in package com.mycompanyname .

Mono
   .just("some text")
   .log(
       "category",
       Level.FINEST,
       SignalType.ON_SUBSCRIBE, SignalType.ON_NEXT, SignalType.ON_COMPLETE
   );

I set my logging in the applicaton.yaml like this:

logging:
  level:
    com.mycompanyname: TRACE

I would expect to see log statements if I subscribe to the Mono but I do not. For what package do I have to set the log level to TRACE ?

If I change my config in the application.yaml to

logging:
  level:
    ROOT: TRACE

then I can see the log messages from my Mono stream.

Answer 1

If the configuration in the application.yaml looks like this

logging:
  level:
    com.mycompanyname: TRACE

then the logging in the Mono has to be defined like this:

Mono
   .just("some text")
   .log(
       "com.mycompanyname.myclassname",
       Level.FINEST,
       SignalType.ON_SUBSCRIBE, SignalType.ON_NEXT, SignalType.ON_COMPLETE
   );

or

Mono
   .just("some text")
   .log(
       this.getClass().getName(),
       Level.FINEST,
       SignalType.ON_SUBSCRIBE, SignalType.ON_NEXT, SignalType.ON_COMPLETE
   );

The category parameter of the log method has to match the logging configuration name.