At the moment, the logger name of inner classes is OuterClass$InnerClass.
Because of that, the logging level of OuterClass isn't inherited by InnerClass at the moment.

If LoggerFactory changed the logger name to OuterClass.InnerClass instead, InnerClass would inherit the logging level of OuterClass which seems intuitively correct.

I'd suggest to accept both $InnerClass and .InnerClass style in logback configurations for compatibility and usability reasons.