public final void updateServices(List<VespaService> services) {
        if (sentinel != null) {
            log.log(FINE, "Updating services ");
            sentinel.updateServiceStatuses(services);
        }
    }
Sets 'alive=false' for services that are no longer running.
Note that the status is updated in-place for the given services.
metrics-proxy/src/main/java/ai/vespa/metricsproxy/service/VespaServices.java