My searching has been fruitless. Is there an open source project for feature gating ala Facebook's Gatekeeper? https://www.facebook.com/notes/facebook-engineering/building-and-testing-at-facebook/10151004157328920
To be honest a lot of this is depending on your application-type.<p>In my case I run a website, and it has a proxy as the public-facing front-end. Requests are distributed "evenly" to one of four back-ends. If I make a new feature and I want to test it I just deploy it to one app-server, which means that roughly 25% of visitors see it.<p>Instead I could deploy to all servers, and handle it at the application level instead. For example show the new hotness to requesters if a random number between 1-10 is <2, or similar.