<A target="_blank" href="http://www.curiousmitch.com/2011/10/your-domino-server-console-will-never-look-same-again/">Mitch Cohen wants to remind you, the Domino 8.5.3 debug_threadID is now enabled</A> by default, which might be a little confusing if you watch the console screen. He's posted a link to the Technote.