Thanks for the response.
Noted. In light of us both having already irrevocably posted in this oh so inappropriate thread…
Exactly what I needed thank you! Yes you are correct, monitoring threads is not my forte/priority (358 posts at present). I did read the announcements as those are more of a priority and are more succinct - but obviously not thoroughly enough or perhaps I just did not understand what I was reading secondary to being a relative beginner as I mentioned. Appreciate your patience. I found the reference you mentioned and was able to fix my problem 
That actually is the syntax in my log4j2 file. Tbh I just don’t understand it (as I mentioned previously I am a relative beginner and do not speak XML). I was confused by the way that WordPad opened the file with strange spacing which I now realize was stupidly due to text wrapping. This strangely carried over into what I copied/pasted, as you suspected, so I unknowingly copied half of a statement. Anyway turns out when I did my log:set I had added “org.openhab.core.items.events.GroupStateUpdatedEvent” instead of what you posted above and what is mentioned in the thread you referenced. What I had was close to correct - I just added the “org.” and the “.core.items.” parts in error, trying to match the formatting of the other entries I guess, and thus accomplished nothing even though I had relatively blindly stumbled on roughly the correct sequence of steps.
Thanks again for the help and understanding, it has been a learning experience.