FlowSchema in Kubernetes: Fine-Grained API Traffic Control

Kubernetes’ API Priority and Fairness (APF) feature provides a granular mechanism to prevent request storms from overwhelming the API server and to ensure that critical operations (like leader election and node heartbeats) are never starved. At the heart of APF is the FlowSchema resource, which classifies incoming requests into “flows” and routes them to designated priority levels with configurable concurrency limits and queuing behavior.