A simple version of this is to do a very cheap SELECT * [where tenant = ...] of your feature flag table(s) to a dictionary structure in memory on every single edge/application server, and do this atomically every few seconds or minutes.

Statsig [0] and Transifex [1] both use this pattern to great effect, transmitting not only data but logic on permissions and liveness, and you can roll your own versions of all this for your own domain models.

I'm of the opinion that every agile project should start with a system like this; it opens up entirely new avenues of real-time configuration deployment to satisfy in-the-moment business/editorial needs, while providing breathing room to the development team to ensure codebase stability.

(As long as all you need is eventual consistency, of course, and are fine with these structures changing in the midst of a request or long-running operation, and are fine with not being able to read your writes if you ever change these values! If any of that sounds necessary, you'll need some notion of distributed consensus.)

[0] https://docs.statsig.com/server/introduction

[1] https://developers.transifex.com/docs/native