Hit ratio dropped significantly after recent upgrades

[Dridi Boukelmoune]

> Could there be some other resource limitation I'm hitting without knowing it (nothing in any logs I've seen)? Everything else I could think of so far seems fine, e.g. open files, threads, tcp connections.

We can't tell if we can't have a look at a transaction's log so please
find one thumbnail's req+bereq log with varnishlog and post it on the
list. Check that it doesn't contain sensitive information and otherwise
sanitize it before posting.

Dridi