@Override
    public void done(RouteMetricSet metrics) {
        try {
		    output.println("# Time used, num ok, num error, min latency, max latency, average latency");
            printMetrics(output, metrics);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
Class that takes progress from the feed and prints to a stream.
vespaclient-java/src/main/java/com/yahoo/vespafeeder/BenchmarkProgressPrinter.java