Instance re-starting is normal in the present case, and your application should take this into consideration. Hardware and software failures that cause early termination or frequent restarts can occur without prior warning and can take considerable time to resolve; thus, you should construct your application in a way that tolerates these failures. You may find related detail on the "How Instances are Managed" documentation page <https://cloud.google.com/appengine/docs/standard/python/how-instances-are-managed#instance_uptime>. Some good strategies for avoiding downtime are listed on that page. You may also consider changing your app.yaml with line basic_scaling: instances: 2, or more than 1.
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