Very high priority isn’t a number that you especially want low (or high), in fact it’s probably not good for it to be 0. It’s just what is considered important to work on. Once those are fixed, even if no new problem crops up, they’ll just relabel existing bugs that they want to focus on getting fixed.

This is in contrast to the 15-minute bugs, that you do want to go to zero.

No, it had been there previously (a few months ago). The last three apparently are the toughest.