Mailing List Archive: A better way to do Varnish hit rate?

I currently analyze varnish hit rate like this

http://d.pr/i/RswMeL
<https://mailtrack.io/trace/link/2a6a624a67c72c8b5fabc0f3ba4f44c93eb39964?url=http%3A%2F%2Fd.pr%2Fi%2FRswMeL&userId=74734&signature=167bba0ff7e3ed50>

While this is good, a major part of the request the server services is
non-cacheable. This brings down the hit rate drastically.

How can I modify this such that I count only requests that are candidates
for caching and calculate the rate? Which varnishstat metric should I be
looking?

- Quintin