[Gertig]

This looks really great! Would have loved something like this a couple of years ago before rolling our own, this would have saved so much time and effort.

Borrowing a lot of LaunchDarkly's playbook for feature flagging will serve you well here. Server Sent Events and providing a self host-able "relay proxy"[1] will be extremely valuable in terms of perf and redundancy.

[1] https://github.com/launchdarkly/ld-relay