Yeah, this for sure. Traffic mix changes over the life of an application. In k8s performance isolation certainly isn't a solved problem, and noisy neighbours can affect the "power" of a server.

Any change to the application at all could upset the delicate balance of its performance. You would need to be doing this sort of profiling on every change, using up to date and accurate production traffic.

It ends up being much easier to put some smarts in your load balancer.