I find the name of this setting odd - this is referred to elsewhere as "the Metrics tab". I guess the app name is class_dashboard, though.

Maybe, add some comments here to say "This enables the Metrics tab on the instructor dashboard" so it's clearer what the setting is. And maybe we don't need to add ('class_dashboard',) to INSTALLED_APPS unless FEATURES['CLASS_DASHBOARD'] is True? Does it make sense to install an unused app? (I'm unaware if that has performance implications)