Too Long; Didn't Read
AWS Karpenter is an option if you’re on AWS and considering the native Kubernetes Cluster Autoscaler. Today, AWS offers 400+ instances, so node pools on which the Kubernetes Cluster Autoscaler works become unmanageable considering the exhaustible instance inventory. This is essentially what Karpenter kind of tries to solve.
If you’re looking for an autoscaler that can significantly reduce your cloud bill for production workloads without impacting their availability, you need to look elsewhere.