Heroku has moved this issue to resolved, so we are too. They don't seem to have a root cause ye but we don't believe there is anything to do on our end.
We haven't seen any degradations since yesterday and things appear to be back to normal.
We are continuing to monitor for any further issues.
Posted Mar 16, 2020 - 20:05 UTC
Monitoring
Heroku (our hosting provider) is having problems with routing in their US region and other outages across the platform. You can read here for further information: https://status.heroku.com/incidents/1973.