Runtime Briefing — Kubernetes 1.22 (Pompeii) Release

Executive briefing: The Kubernetes Release Team delivered v1.22 “Pompeii” on 4 August 2021. The milestone includes 53 enhancements with 13 graduating to stable, 24 moving to beta, and introduces breaking removals that require cluster operator action.

Key features

• Server-side Apply GA. Declarative apply is now stable, enabling controllers and GitOps tools to manage object fields without client-side merges.
• External credential providers GA. Client-go can integrate with exec plugins such as AWS IAM authenticator and Azure CLI for seamless, pluggable authentication.
• PodSecurityPolicy removal. PSP is removed in 1.25, with 1.22 issuing warnings and introducing the admission-based Pod Security standards as the migration path.

Implementation guidance

• Review API removals. Validate workloads for deprecated APIs such as autoscaling/v2beta2 and Ingress v1beta1, upgrading manifests before cluster upgrades.
• Adopt Pod Security admission. Plan namespace label strategies (privileged, baseline, restricted) and integrate with policy enforcement tooling.
• GitOps readiness. Update Flux, Argo CD, or custom controllers to leverage server-side Apply and resolve field ownership conflicts.

Enablement moves

• Run conformance and upgrade rehearsals on staging clusters to uncover deprecated API usage.
• Refresh internal platform documentation on CSI migration timelines, Windows node support, and topology-aware hints introduced in 1.22.
• Coordinate with security teams on Kyverno/OPA policies that replace PSP functionality.

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