The edgeapp.net apps are not as stable as the more recent container based apps. They’re usually fine, but this kind of issue hits them harder than the container based apps we launched a couple of years ago.
Email us (support@fly.io) the JS runtime app name and the new container runtime app name
We’ll link all your certificates in
You can test as much as you want after that, none of this is disruptive. When you’re ready, you just change DNS to point to the new app and you’re good to go.