Hello,
I'm trying to write a module that will collect extended stats, that is more then what is offered by stub_status. I've dumped a couple of stats, but had to modify source code outside the module. Modifying vanilla source isn't an option for me. So before I begin, I was wondering if I could get some information:

1) Can I collect stats on every request? I want to know how many bytes were written in the body and headers out to the client.
2) Is it possible to collect stats on reverse proxy's? IE: how many upstream connections are there, have there been, failed, 50x's?
3) Do this all inside of a module?

Thanks in advance.