docs: public static synchronized String getGoogleChartURL(int minutes, int width, int height, String timeLabel) {
  
          ArrayDeque<Datum> history = historyS;
          if (minutes > 2) history = historyM;
          if (minutes > 30) history = historyL;
  
          HTMLChartHelper chart = new HTMLChartHelper();
          chart.width = width;
          chart.height = height;
          chart.timeLabel = timeLabel;
  
          HTMLChartHelper.DataSet Jds = new HTMLChartHelper.DataSet();
          chart.data.add(Jds);
          Jds.title = "UsedJava";
          Jds.belowcolor = "ff9999";
  
          HTMLChartHelper.DataSet Rds = new HTMLChartHelper.DataSet();
          chart.data.add(Rds);
          Rds.title = "RSS";
          Rds.belowcolor = "ff0000";
  
          HTMLChartHelper.DataSet RUds = new HTMLChartHelper.DataSet();
          chart.data.add(RUds);
          RUds.title = "RSS+UnusedJava";
          RUds.dashlength = 6;
          RUds.spacelength = 3;
          RUds.thickness = 2;
          RUds.belowcolor = "ffffff";
  
          long cropts = System.currentTimeMillis();
          cropts -= (60 * 1000 * minutes);
          long modulo = (60 * 1000 * minutes) / 30;
  
          double maxmemdatum = 0;
  
          for (Datum d : history) {
              if (d.timestamp < cropts) continue;
  
              double javaused = d.javausedheapmem + d.javausedsysmem;
              double javaunused = SystemStatsCollector.javamaxheapmem - d.javausedheapmem;
              javaused /= 1204 * 1024;
              javaunused /= 1204 * 1024;
              double rss = d.rss / 1024 / 1024;
  
              long ts = (d.timestamp / modulo) * modulo;
  
              if ((rss + javaunused) > maxmemdatum)
                  maxmemdatum = rss + javaunused;
  
              RUds.append(ts, rss + javaunused);
              Rds.append(ts, rss);
              Jds.append(ts, javaused);
          }
  
          chart.megsMax = 2;
          while (chart.megsMax < maxmemdatum)
              chart.megsMax *= 2;
  
          return chart.getURL(minutes);
      }