We just did a routine deploy on Heroku, and _every single request_ began failing. Checking logs it says "code=H10 desc="App crashed"" without anything else.

Looking around elsewhere, I see other apps are failing with the exact same error (eg. https://isdown.app/integrations/heroku?c=1685469931)

Seems there was scheduled maintenance on some logging system, and there's some homepage / sign-up page service being done too (https://status.heroku.com/).