Rack apps mounted in Rails — how to protect access to them?

Sidekiq, Flipper, RailsEventStore — what do these Rails gems have in common? They all ship web apps with UI to enhance their usefulness in the application. Getting an overview of processed jobs, managing visibility of feature toggles, browsing events, their correlations and streams — nothing you could not do in code or Rails console already. But never really wanted to do there 😉In Rails apps we add those UI apps with mount in routing:.