We first implemented the Design System Visual Coverage to track the design system impact on users' devices, coloring the pixels during navigation without impacting the UX.
We then implemented a more classic static analysis system and dashboard, to have earlier feedback on what the Product teams are doing in terms of using the design system.
I will present our experience to show engineers, designers, and company leaders the measurable value of the Design System in our products at Preply, a language learning platform with ~50M lessons taken per year.