Microscaling containers to maintain queue length using control theory (blog.microscaling.com)

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.