One other idea:

We simply do this by default for all cloud images, without a timeout - if no 
cloud-init metadata is provided, you can log in to the hypervisor console and 
see an autogenerated root password.

I'd say we should also ensure that *remote* ssh access is disabled in this 
scenario - if you want to log in over ssh, you'd need to change the password 
and enable remote ssh password auth (cloud-init disables it by default).

It'd be a notable policy change, but in practice I think quite secure - if you 
have access to the hypervisor console you tend to have total control over a 
system anyways.  And we're only talking about cloud images, not bare metal.
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