We are not. Knative is a great project and something we're definitely looking into for more "function" type workload offerings down the road.

Today our container/vm solution does not have a warmup concept other than the initial deployment of your container. You simply specify your image, some attributes, and it's deployed to the locations specified on our Edge. Once deployed, you have the ability to delete the workload at any time, but it's not elastic based on requests to the workload.