It has been a long grueling upgrade, made particularly difficult by one server having drivers not officially supported under 5.13.x kernels, but I got it working.
All NFS mounts and NIS bindings have been verified.
Another issue this time around, at some point some bug(s) have been introduced into systemd causing it to be unreliable at starting some services during boot. But everything is up and running now.
I’m behind in getting receipts and expiration notices out but should be able to get caught up on that this weekend providing no other major disasters. Thanks for the folks at QualSys for not waiting for the kernel folks to really adequately test things before releasing an exploit for the Sequoia exploit (and yes I do mean this sarcastically).