Add ability to expire and log configs
Add ability to expire and log configs

Reviewed By: knekritz

Differential Revision: D2642995

fb-gh-sync-id: 54085ce9b9f0d95fc31518753b34446238b0986b

LilMeyer/proxygen,LilMeyer/proxygen,Orvid/proxygen,LilMeyer/proxygen,Orvid/proxygen,Orvid/proxygen,LilMeyer/proxygen,Orvid/proxygen