System became unresponsive, no gui, no dockers etc. ssh was working - where did I go wrong ?

So - todays fun and games - I came home to my kids complaining emby stopped working.

unraid gui not there, no dockers were working.

I could ping the unraid server fine, and I could ssh into it so I googled here some command line safe shutdown stuff.

Here is what I did if someone can comment if this is correct of not :

diagnostics - it just sat there, waited 5 mins before killing it.

Tries a restart of the gui with this : /etc/rc.d/rc.php-fpm restart

but only got this :
Gracefully shutting down php-fpm ................................... failed. Use force-quit
Starting php-fpm [ERROR] Another FPM instance seems to already listen on /var/run/php5-fpm.sock
[ERROR] FPM initialization failed
 failed

Tried a Stop array with this :
#!/bin/bash
emcmd cmdStop=Stop
(but it just sits there for ages - aborted)

ps -ef and top were showing docker containers running still

Tried Stop all dockers :
docker stop $(docker ps -q)

It just sat there - and still the docker containers running

Tried Gracefull shutdown from command line : Powerdown
(ran, but could ping it forever) - so nothing happened.

Shutdown : - ran a shutdown now

got this - which looks like it is doinmg the usual
Broadcast message from root@Tower (pts/0) (Thu Jan 11 15:16:15 2024):
The system is going down to maintenance mode NOW!

But - In top and ps-ef, I can still see some dockers......

At this stage i had exhausted my limited knowledge and my known command list above, so I have to hold the power button and get the usual parity rebuild.

I dont have diags (due to above), but can anyone tell me a process I should have followed in the above ?

The only change I have done recently (yesterday) is to stop the VM engine (as I moved homeassistant and shinobi to docker containers), and I changed the CPU pegging so all containers have the right three pairs and emby has 4 pairs, and the first pair are not set to any (kept for OS - but there is no CPI isolation.  Like this :