[Monitoring]: Health checks, automatic restarts, and alerts

[jonaro00]

Built-in health checks allows us to monitor your project's health. You could then enable us to alert you and/or restart your project if it goes down.

This can also enable things like status badges #1191

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_{This issue is a part of the Product Feature Poll (all issues). React with 👍 if you want this feature. Comment if you have suggestions related to this feature.}

[jonaro00]

Update:
The shuttle.dev platform does implement automatic restarts on a crashing deployment.
The ability to define custom health check behavior is a planned feature.