website/content/en/docs/reference/command-line-tools-reference/feature-gates/custom-resource-validation-expressions.md

title	content_type	_build	stages
CustomResourceValidationExpressions	feature_gate	list render never false	stage defaultValue fromVersion toVersion alpha false 1.23 1.24 stage defaultValue fromVersion toVersion beta true 1.25 1.28 stage defaultValue fromVersion stable true 1.29

Enable expression language validation in CRD which will validate customer resource based on validation rules written in the x-kubernetes-validations extension.