This is also known as a "kill switch" which is technically slightly different than feature flags that get used for release safety. You can bake kill switches i

This is also known as a "kill switch" which is technically slightly different than feature flags that get used for release safety. You can bake kill switches into many features as a core part of the application for operational reasons. One similar thing I like is having global "maintenance" switches so you can gracefully put an application into maintenance mode.