Heroku reports that everything is operating normally.

The Heroku API is working now, but some customers are still reporting dynos failing to boot.

Salesforce also posted an incident with more info: https://status.salesforce.com/generalmessages/10001540

We're currently unable to scale Heroku apps due to an API outage.

Heroku has created an incident on their status page at https://status.heroku.com/incidents/2822, but their status page is failing to load sometimes.