Hey there!

It looks like your application may not be completing the deploy process before the health checks are starting on your app. One option here would be to ensure that any migrations or configurations are done post deploy. The other option would be to modify the intial_delay_seconds for the health checks in your app’s spec file. Setting that to a value like 30 or more would increase the time before those health checks start. This would allow for your application to finish fully deploying before those run.

For reference on this app spec please see: App Spec Ref

Hope it helps!
Nate