Looks like a bug: what is wrong with node consolidation in Karpenter?

This article examines the issue of inefficient node consolidation in Karpenter, a popular Kubernetes autoscaler. The author analyzes a scenario where unused resource volume does not decrease and nodes undergo endless rotation, raising questions about the tool's operational correctness. The material breaks down Karpenter's internal consolidation mechanisms, explains the causes of such 'bugs,' and offers practical recommendations for diagnosing and configuring the system to optimize infrastructure. The article is useful for DevOps engineers and SREs working with AWS and Kubernetes who encounter excessive resource consumption or cluster instability when using autoscaling. The author addresses whether this behavior is normal for an autoscaler and what steps are necessary to fix the situation, ensuring stable and cost-effective cloud infrastructure management.