Provided fragment is from logback.xml translated from Kafka's log4j.properties whose one logger has $ in name.
I wanted just to have equivalent logback.xml, to replace log4j with logback, to be able to use custom already made complex logback encoder.
kafka.network.RequestChannel is a Scala class with companion object which has some logging. Here is what Scala compile produces for it:
I guess $ is needed if one wants to be very specific and reference only loggers from companion object, top and nested.
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