Yes, cannot push/deploy. Also can't view https://help.heroku.com/UMAUQ4UF/why-am-i-seeing-application... because it says I'm not logged in, but also I can't log in.

Also, why do I have to be logged in to view their help pages?

Looks like Heroku posted a status page incident, largely retroactively: https://status.heroku.com/incidents/2409

Yeah, flaky dashboard, unable to get proper visuals on apps, can't restart apps.

Unable to log in to the dashboard but my applications themselves are still running.

Is there anything on /r/heroku?

Yes, unable to deploy at the moment.