public Optional<AthenzService> athenzService(InstanceName instance, Environment environment, RegionName region) {
        return (environment.isManuallyDeployed() ? devSpec.athenzService
                                                 : instance(instance).flatMap(spec -> spec.athenzService(environment, region)))
                .or(this::athenzService);
    }
The most specific Athenz service for the given arguments.
config-model-api/src/main/java/com/yahoo/config/application/api/DeploymentSpec.java