@Override
    public Set<ConfigKey<?>> listConfigs(ApplicationId appId, Optional<Version> vespaVersion, boolean recursive) {
        Application application = getApplication(appId, vespaVersion);
        return listConfigs(application, null, recursive);
    }
Activates the config of the given app. Notifies listeners

@param applicationVersions the {@link ApplicationVersions} to be activated
configserver/src/main/java/com/yahoo/vespa/config/server/application/TenantApplications.java