The parameter values depend on your app as there's no catch-all answer for this. You have to get a feel for it and see; if it's creating too many instances, you might want to upgrade the type of instances or keep more idle instances. If you see that the instances can't catch up with a traffic spike, you might want to have a lower threshold of max requests per instance to start another instance before the existing ones are at capacity. Ultimately, you're the one that can monitor and adapt scaling to the needs of your app and traffic.
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