We're going to mark this incident as resolved for now and continue the conversation with Heroku. In the meantime, please email firstname.lastname@example.org if you are running into this issue and we will manually reset your project SSH key.
Posted 11 months ago. Nov 02, 2017 - 23:59 UTC
Still communicating with Heroku on issue.
Posted 11 months ago. Nov 02, 2017 - 23:38 UTC
Communicating with Heroku to investigate whether key usage rules have changed recently.