feature-flags
3 articles
-
Remote Config: How to Test What Changes Without a Release
A Remote Config hotfix didn't apply because an old cached config overrode the new one, and the 'fix' was verified on a build players don't have. A first-person breakdown: config versions, when changes actually reach the player, compatibility with old clients, and a QA checklist.
-
Testing Feature Flags and A/B Experiments: How Not to Ship a Mess of Variants
A flag isn't "on/off" — it's a live branch of code in production that you test in both states. A first-person take: why one flag becomes a matrix of states; where the nasty targeting and sticky-bucketing bugs hide; how to test an A/B experiment as a mechanism rather than a hypothesis; kill switches, zombie flags, and a pre-release checklist.
-
Knight Capital: how $440M vanished in 45 minutes because of one deploy
A QA-eye breakdown of the August 1, 2012 disaster: a reused feature flag, an unnoticed 8th server, the dead Power Peg code, and 97 ignored alerts. 7 lessons and a 10-point release-process checklist.