on https://cloud.google.com/kubernetes-engine/docs/concepts/verticalpodautoscaler :

They have mentioned this statmenet below :

""Do not use vertical Pod autoscaling with Horizontal Pod autoscaling on CPU or memory. However, you can use vertical Pod autoscaling with Horizontal Pod autoscaling on custom and external metrics."

is this true? can we apply both scalings together?

if so any scenario which it can be applied together?