Hello Roman, It is not possible to implement custom health checks in App Engine Standard. Still, App Engine sends periodic health check requests to confirm that an instance has been successfully deployed, and to check that a running instance maintains a healthy status. Each health check must be answered within a specified time interval. An instance is unhealthy when it fails to respond to a specified number of consecutive health check requests. This procedure covers normally the situation you describe, and offers chances of providing for faulty instances and avoiding status 500 for hours. You should organize your GAE Standard apps to handle this situation. More details on the "How Instances are Managed" page <https://cloud.google.com/appengine/docs/standard/go/how-instances-are-managed#instance_uptime> .
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