Kubernetes v1.36 introduces Declarative Validation framework as a General Availability feature, replacing 18,000 lines of handwritten validation code with structured marker tags.
- •validation-gen code generator automatically parses +k8s: marker tags and generates Go validation functions
- •Comprehensive suite of marker tags for presence, constraints, collections, unions, and immutability checks
- •Ambient ratcheting built-in ensures backward compatibility when validation rules change
- •Enables kube-api-linter tool for automated API review and consistency enforcement
- •Future integration with OpenAPI schemas and ecosystem tools like Kubebuilder for CRD authoring
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