Kubernetes Priority and Fairness with PriorityLevelConfiguration

Kubernetes’ API Priority and Fairness (APF) mechanism ensures that, under heavy load, critical requests are serviced preferentially while preventing misbehaving clients from starving the API server. This is achieved through two custom resources: FlowSchema, which classifies inbound requests, and PriorityLevelConfiguration, which defines the priority levels, their relative share of API server concurrency, and how excess requests are handled.