docs: public static void collectStats(final StatsCollector collector) {
      collector.record("http.latency", graphlatency, "type=graph");
      collector.record("http.latency", gnuplotlatency, "type=gnuplot");
      collector.record("http.graph.requests", graphs_diskcache_hit, "cache=disk");
      collector.record("http.graph.requests", graphs_generated, "cache=miss");
    }