Android's new Dashboard feature is designed around "digital wellbeing." It'll show you stats like how much time you spend in apps, how many times you've unlocked your devices, and how many notifications you've received. Dashboard's purpose is to make you more mindful of just how much you use your devices.
Android P will also let you manage how long you use certain apps. It'll "nudge" you when you're close to your time limit, and when your time is up, the app icon will be grayed out. You'll still be able to use the app, but the app icon's gray color serves as a reminder that you've used up all the time you've allotted yourself for that app.