Much as I hated doing it, after 2 hours without the server, no dockers running, and no access to data, I powered off (5 second press of the power button), gave it a few moments, then turned the power back on.
The server came back up, all dockers started, no indications of error, and it did not report an unclean shutdown and start a parity check (which, frankly, surprises me).
I may initiate a parity check later, just to be on the safe side.
Not sure it'll help, but here are diagnostics after it booted. nas-diagnostics-20240610-2029.zip
This might help with a post-mortum - the syslog date stamped yesterday. Last entry is 9 June 2024 @ 13:42, but maybe there's a clue?
syslog-20240609-134232.txt
