Here is my two cents: there is nothing I can do that would decrease the chances of outage. The chances of Anvil or network outage are way smaller than the chances of failure of any server I setup by myself.
Meredydd said “it looks like this was a Linux kernel bug 
”, and was able to solve the problem in 20 minutes.
I don’t know the details, but I have the strong feeling that if that bug showed up on my own server, the chances of me being able to find it and fix it in 20 minutes would be pretty low.
I will eventually play setting up my own Anvil server, but I will keep the production apps managed by Anvil.