Can I use supershields for an internal company metric to be displayed on a GitHub enterprise instance? I've tried using shields.io in the past for this and the API endpoint typically must be publicly accessible to make a metric button out of it.
There is a supershields Github app that you can install and then give access to one or more private Github repos. Then when you create Github badges on supershields.io you'll get the option to connect them with your private repo.