Add details to resoruce usage graduation criteria

keps/sig-api-machinery/2876-crd-validation-expression-language/README.md

@@ -446,7 +446,9 @@ We will extend both the unit test suite and the integration test suite to cover
 
 #### Beta
 
+- Understanding of upper bounds of CPU/memory usage and appropriate limits set to prevent abuse.
 - Build-in macro/function library is comprehensive and stable (any changes to this will be a breaking change)
+- CEL numeric comparison issue is resolved
 
 ## Production Readiness Review Questionnaire
 
@@ -572,6 +574,9 @@ but will measure it before Beta.
 
 We don't expect it to. We will measure this before Beta.
 
+Specifically we will ddemonstrate an upper bound on the resource cost someone could incur with a CEL expression that is some some
+combination of large, compact, complex vs. similar combinations using existing validation rules (suggested by @liggitt)
+
 ### Troubleshooting
 
 <!--