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by m4dc4pXXX 3716 days ago
I haven't used control theory to scale services up & down, but I have used it to regulate requests from a batch process to a production service, scaling the request rate up and down in order to avoid overloading the service.

Philip Janert's book "Feedback Control for Computer Systems" had everything I needed to know to understand control theory & implement it for my particular scenario. Great book.