Comment by beachstartup

it seems to me you'd have to know at a minimum:

1. every tag pattern that triggers the bug(s)

2. which broken pages with that pattern were requested at an abnormally high frequency or had an unusually short TTL (or some other useful heuristic)

3. on which servers, and at what time, in order to tell

4. who's data lived on the same servers at the same time as those broken pages

to even begin to estimate the scope of the leak. and that doesn't even help you find who planted the bad seeds.