Clojurians Log v2

I tried to find that code in cider-nrepl but is there any?

It's an nREPL thing.

ah, I see: https://github.com/nrepl/nrepl/blob/master/src/java/nrepl/JvmtiAgent.java

Yes, there and https://github.com/nrepl/nrepl/blob/master/src/clojure/nrepl/util/threading.clj#L50

and: https://github.com/nrepl/nrepl/blob/master/libnrepl/src/nrepl_agent.c