This isn't exclusive to containers, you had this problem with VMs and even hardware. Back in the physical server days, when you didn't have enough CPU to servi

This isn't exclusive to containers, you had this problem with VMs and even hardware. Back in the physical server days, when you didn't have enough CPU to service the current rate of inbound requests, eventually your healthchecks start to fail and load balancers would evict you from the pool. Now instead of a physical CPU, it sounds like you're running into a CPU limit implemented in the kernel but the same basic principles apply. Kubernetes changes how you create the infrastructure but you still have the same problems you had in a distributed system before.