public static ApplicationId from(ApplicationIdConfig config) {
        return from(TenantName.from(config.tenant()),
                    ApplicationName.from(config.application()),
                    InstanceName.from(config.instance()));
    }
A complete, immutable identification of an application instance.

@author Ulf Lilleengen
@author vegard
@author bratseth
config-provisioning/src/main/java/com/yahoo/config/provision/ApplicationId.java