public ServiceListResponse checkConvergenceUnlessDeferringChangesUntilRestart(Application application, Set<String> hostnames) {
        Duration timeoutPerService = Duration.ofSeconds(10);
        return checkConvergence(application, timeoutPerService, new HostsToCheck(hostnames));
    }
Checks services except those which defer config changes until restart in the given application.
Returns the minimum current generation of those services.
configserver/src/main/java/com/yahoo/vespa/config/server/application/ConfigConvergenceChecker.java