Managing Office 365 groups

I’m relatively new to Groups in Office 365 but would like to see how we can take advantage of this. One question I have while playing around with this-

How do you monitor the SharePoint site footprint of all the sites(site collections?) created through Groups. I don’t see the listing back in SharePoint online list of site collections. I guess structurally this comes from Exchange so I understand it but would be nice to be able to view it somewhere.