KubeCon + CloudNativeCon Europe 2025

In a Kubernetes multi-tenant environment, cluster administrators face the challenge of keeping the platform stable amid competing and diverse workloads. A single misbehaving user can overload the Control Plane or use much more than their share of resources.

API Priority and Fairness (APF) and Resource Quotas are the Kubernetes tools for administrators to address these concerns. APF provides a fine-grained classification to throttle API Server requests, while Resource Quotas provides constraints that limit resource consumption per namespace. However, tuning them to be effective and not too restrictive at the same time can be complex.

In this session, we will talk about what we learned implementing both across hundreds of clusters and thousands of workloads. We will cover our setup and configuration, the challenges we faced and our tips to address them, the drawbacks you need to be aware of, and how to reuse what we learned for your own clusters.