We don’t need logs from before the update.
We need logs to diagnose the ‘unavailable’
Right now you only have one symptom. Things become unavailable. You did install a. 2004.3.x release and after random times stuff drops.
The timing of the updates becimg Available are quite likely a red herring due to convenient timing. Very little actually happens to the system after it checks for updates.
More likely is increased memory load, some kind of race condition, or memory leak issue is setting you up for a slow burn crash that happens when you’re not around. The only way to know is logs.
If you care to troubleshoot that, this link from the cookbook tells you how to grab logs from before a restart: How to get to your log after restart/restore