Something that I think should be emphasized is that machines need to have a restart policy of always. It’s strange because this seems important and it’s not even documented?
At some point this was made the default, but that wasn’t the case when I migrated my apps from v1 to v2.
I had to manually do fly machines update <machine-id> for every machine of every v2 app to apply the new default setting. My PG machines didn’t need to be updated though.