HostStatus getHostStatus(String hostname, int port, Duration timeout) {
        Target target = supervisor.connect(new Spec(hostname, port));
        Request request = new Request("filedistribution.getActiveFileReferencesStatus");
        target.invokeSync(request, timeout);
        HostStatus hostStatus = createHostStatusFromResponse(hostname, request);
        target.close();
        return hostStatus;
    }
File distribution status for each host in the application

@author hmusum
configserver/src/main/java/com/yahoo/vespa/config/server/application/FileDistributionStatus.java