Resolved
H10 error rates are back to normal. Please reach out to Heroku Support if your app continues to generate H10 errors.
Monitoring
Engineers are currently monitoring to ensure that things are back to normal.
In case H10 errors persist, please open a Support ticket.
Issue
Engineers have identified the cause of the issue and are implementing a fix on the affected apps.
In case H10 errors persist, please open a Support ticket.
Investigating
We have identified a small subset of applications on the Common Runtime, primarily running free or hobby-tier dynos, that are seeing an increased rate of H10 errors.