Event details
I hope there's not a question limit! 
When upgrading Domain Controllers, I've never done in place upgrades. I heard somewhere long ago its not the done thing, but I can't remember where or why.
I've always built new DC's, then stolen the IP address and promoted in place, all the way back from 2003 until now in 2019.
The young whipper snappers on my team tells me this is an old way of thinking....
Question:
Are in-place upgrades of Domain Controllers properly supported now, or even recommended? Any Caveats we should be aware of?
I personally have had good experience upgrading DCs as long as not SBS.
Took one from Server 2008, to Server 2019, had to stop at 2012R2 first... But all of their accounts, applications, databases etc. Came through.
The first step was to P2V the server on new hardware using Hyper-V.