[Observium] Configuring a custom dashboard

Sadly I can find no documentation on individual dashboard widgets?

I want to create a dashboard with some specific graphs. Is there a widget which will display such? (I'd prefer not to have to do the "compose a blank HTML page with links to graphs" style of dashboard because of the authentication disconnect.)

What is the widget used on the default dashboard to show Internet Traffic?

What is "Traffic Composition?" (a.k.a "Traffic Comparison") and how do you configure it?

All the the widgets appear to have a settings option where one adds flags of some sort to an array? But they don't appear to be editable?

Thanks for your time.