Haha I know you get plenty of traffic @tmcw, but if this site is approaching 100GB bandwidth/month, that’s pretty neat. Right on 
I’ll leave the answer to your actual question to the on-staff support engineers 
– For what it’s worth, I do know that a few folks use CloudFlare in front of Netlify (though it’s not exactly recommended) for the sake of CloudFlare’s bandwidth tracking, request visibility, and even reducing the bandwidth draw to Netlify as another caching layer (ref).
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Jon