I’d been running Cluster Autoscaler on our production EKS cluster for years. It worked. It wasn’t exciting, it wasn’t cheap, but it worked. Then in early 2025 Karpenter hit v1 and the API stopped breaking every release, and I finally ran out of excuses. This is the story of that migration — what I learned, what I’d do differently, and why I think Karpenter has effectively won the EKS autoscaling argument.
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