public Builder expression(Output<String> expression) {
            $.expression = expression;
            return this;
        }
@param expression Expression represents the expression which will be evaluated by CEL. Must evaluate to bool. CEL expressions have access to the contents of the AdmissionRequest and Authorizer, organized into CEL variables:

&#39;object&#39; - The object from the incoming request. The value is null for DELETE requests. &#39;oldObject&#39; - The existing object. The value is null for CREATE requests. &#39;request&#39; - Attributes of the admission request(/pkg/apis/admission/types.go#AdmissionRequest). &#39;authorizer&#39; - A CEL Authorizer. May be used to perform authorization checks for the principal (user or service account) of the request.
  See https://pkg.go.dev/k8s.io/apiserver/pkg/cel/library#Authz
&#39;authorizer.requestResource&#39; - A CEL ResourceCheck constructed from the &#39;authorizer&#39; and configured with the
  request resource.
Documentation on CEL: https://kubernetes.io/docs/reference/using-api/cel/

Required.

@return builder
sdk/java/src/main/java/com/pulumi/kubernetes/admissionregistration/v1beta1/inputs/MatchConditionArgs.java