code: static void showCluster(
        PrintWriter out, boolean advancedView, JobTracker jobTracker) {
      String cluster = "";
      try {
        cluster = JSPUtil.generateClusterResTable(jobTracker);
        if (cluster.equals("")) {
          return;
        }
      } catch (IOException e) {
        return;
      }
      out.print("<h2>Cluster Resource</h2>\n");
      out.print(cluster);
    }
docs: Print the cluster resource utilization