private String createLbAppIdKey(ApplicationId applicationId) {
        return applicationId.application().value() + ":" + zone.environment().value() + ":" + zone.region().value() + ":" + applicationId.instance().value();
    }
Produces lb-services cfg

@author Vegard Havdal
configserver/src/main/java/com/yahoo/vespa/config/server/model/LbServicesProducer.java