I mean, they must have _some_ way of running code before performing an upgrade, no? So they could check for these processes, store some state on the phone, and

I mean, they must have _some_ way of running code before performing an upgrade, no? So they could check for these processes, store some state on the phone, and after the upgrade display a notice about what happened. This would all be on-device so it's not even a privacy issue.