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Here's a brilliant technique from @danilop to auto scale your AWS Lambda Provisioned Concurrency so that you always have a proportion of functions being kept warm.

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Since the Lambda functions running in Provisioned Concurrency are cheaper than standard Lambda functions, Danilo figured there must be a target percentage at which you break even.

After scribbling on a whiteboard in the AWS #reInvent Expo, the magic value was revealed.

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If you set TargetValue > 0.6, then you are probably saving money, while also keeping more functions warm!

This is rough, assumes ideal conditions and doesn't list all assumptions, your specific traffic patterns may have different results.

More research is needed.

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Note: You probably don't need Lambda Provisioned Concurrency (thanks @ben11kehoe).

Question: If it's possible to break even or save money with this auto scaling approach, why doesn't AWS just do this for us behind the curtains to reduce complexity?

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