@CustomType.Setter
        public Builder fieldRef(String fieldRef) {
            if (fieldRef == null) {
              throw new MissingRequiredPropertyException("ExpressionWarning", "fieldRef");
            }
            this.fieldRef = fieldRef;
            return this;
        }
@return The content of type checking information in a human-readable form. Each line of the warning contains the type that the expression is checked against, followed by the type check error from the compiler.
sdk/java/src/main/java/com/pulumi/kubernetes/admissionregistration/v1beta1/outputs/ExpressionWarning.java