How often do VMs restart?

How often are VM restarted for maintenance? I am worried that config may be erased on VM restarts.

VMs can restart when we have hardware issues (rare), or when a larger VM needs to be scheduled – which might cause us to move running VMs to other services (less rare). Your config will definitely be lost on restarts if you don’t have a persistent volume or you aren’t writing it to an external data store.

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