[omgbear]

I'm pretty happy with our setup, though we use flags mostly for feature releases and only have a few long-lived ones.

State kept in a database table indexed on customer. One row per customer/flag name, only there when the flag is set.

We keep active flags names as constants and put into an array for easy looping in our admin ux. This makes it easy to find usage and clean them up after launch.

These are passed to the browser so the frontend can check flags, and via grpc context to any downstream services.