private ValidationEvent getMissingOperationEvent(ServiceShape service, FromSourceLocation location, String opName) {
        return warning(service,
                location,
                "Service marked `aws.api#TagEnabled` is missing an operation named "
                        + "'" + opName + ".'");
    }
Validates service satisfies AWS tagging requirements.
smithy-aws-traits/src/main/java/software/amazon/smithy/aws/traits/tagging/ServiceTaggingValidator.java