Provide metric with information about available upgrade
Currently there's an upgrade available badge at admin page, but suddenly it's still hard to know if there's an available upgrade or upgrade with important security fix.
So it would be cool to have same information displayed on badge at admin page but as a metric, with such metric it would be possible to setup alert to inform admin about new version.
Suddenly I'm not sure where it would be best place for such metric here or at unicorn monitoring endpoint.