If you have ever opened a PMR for a Domino server crash or hang you are familiar with the debug_threadID notes.ini parameter.
For a while now I have enabled this by default on all of my Domino servers, the only real downside is a slightly busier server console, and more information in the console.log. The upside is more information available to support when it’s needed.
In Domino 8.5.3 debug_threadID is now enabled by default, you can still choose to disable it, but I would recommend leaving it enabled.
Technote 1567602:Lotus Domino 8.5.3 ships with Thread ID debug enabled by default
While it may look messy starting off, from a diagnostic point of view it is great for removing noise from the logs.
Just grep the thread ID you want and you have all the logs in relation to just that.