Why not use HPA directly to expand the capacity of kubernetes dns horizontally?

problem description

kubernetes dns horizontal expansion document: https://kubernetes.io/docs/ta.

uses cluster-proportional-autoscaler ( https://github.com/kubernetes.

)

Why not just use HPA? What"s the difference between HPA and cluster-proportional-autoscaler? Can they replace each other?

K8s kubernetes
Sep.29,2021

https://github.com/kubernetes.
readme has instructions

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