KEP-4153: Declarative Validation

Co-authored-by: Joe Betz <[email protected]>

keps/prod-readiness/sig-api-machinery/4153.yaml

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+kep-number: 4153
+alpha:
+  approver: "@deads2k"

keps/sig-api-machinery/4153-declarative-validation/kep.yaml

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+title: Declarative Validation
+kep-number: 4153
+authors:
+  - "@alexzielenski"
+  - "@jpbetz"
+owning-sig: sig-api-machinery
+status: implementable
+creation-date: 2023-08-20
+reviewers:
+  - apelisse
+  - jpbetz
+  - thockin
+  - robscott
+approvers:
+  - thockin
+  - jpbetz
+  - deads2k
+
+see-also:
+  - "/keps/sig-api-machinery/692-crd-openapi-schema"
+  - "/keps/sig-api-machinery/1929-built-in-default"
+  - "/keps/sig-api-machinery/2876-crd-validation-expression-language"
+  - "/keps/sig-api-machinery/2887-openapi-enum-types"
+  - "/keps/sig-api-machinery/4008-crd-ratcheting"
+
+# The target maturity stage in the current dev cycle for this KEP.
+stage: alpha
+
+# The most recent milestone for which work toward delivery of this KEP has been
+# done. This can be the current (upcoming) milestone, if it is being actively
+# worked on.
+latest-milestone: "v1.29"
+
+# The milestone at which this feature was, or is targeted to be, at each stage.
+milestone:
+  alpha: "v1.29"
+
+# The following PRR answers are required at alpha release
+# List the feature gate name and the components for which it must be enabled
+feature-gates:
+  # Exposes x-kubernetes-validations in published OpenAPI schema
+  - name: DeclarativeValidationExtensionsInOpenAPI
+    components:
+      - kube-apiserver
+  # Switches apiserver to use OpenAPI-based validation instead of handwritten
+  # wherever possible
+  - name: DeclarativeValidation
+    components:
+      - kube-apiserver
+disable-supported: true
+
+# The following PRR answers are required at beta release
+metrics:
+#   - my_feature_metric