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Metrics Server and HorizontalPodAutoscaler

Part VIII changes direction: instead of killing pods under load, we add pods. But to autoscale by CPU, the cluster has to know how much CPU each pod uses — and our hand-built cluster has nobody measuring it yet. This article installs the first add-on, Metrics Server, hits the exact KTHW trap (control plane can't talk to a pod) then fixes it, then stands up an HPA and burns real CPU to watch it multiply pods from 1 to 4.