What's 'io-error' in a yellow triangle and how can I mitigate it?

Did you check the free space of the storage for your VM? Typical „disk full“ error.
 
Ah, okay, you are right. 'local-lvm' was indeed full. Thanks for your help - though I still find 'io-error' a bit confusing, would be happier with 'storage full'.
 
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