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• CRDs and other use cases require validation and policy enforcement that cannot be supported by structural schema and OpenAPI V3 validation
• Webhooks have been the only solution for these use cases, but they are difficult to configure and can cause controlling outages
• Common Expression Language (CEL) is a simpler solution that has been successfully integrated with Kubernetes data system for both CRD and native types
• CEL comes with a standard library and an extended library, and it is easy to extend and embed
• CEL can be used for validation, policy enforcement, and authorization checks
• The presentation offers examples of CEL code and use cases, and it mentions future plans for mutating admission policy and client-side validation 2