Overall Status of selected endpoints for status page

[GalacticAust]

Feature that would be great if you can select monitors and have a overall uptime displayed for the past 30 Days

instead of each monitor listed

[deefdragon]

I don't think this is a Duplicate of #312? It sounds like it is asking for the ability to select a few monitors in the UI and see the sum up-time.

I am still going to cross reference #468 as this is about monitor groupings in general, and the logic used in implementing some of those would likely also be used here.