code: void printCounters() {
      System.out.printf("New Job:\n", counters);
      for (String groupName : counters.getGroupNames()) {
        Counters.Group group = counters.getGroup(groupName);
        System.out.printf("\t%s[%s]\n", groupName, group.getDisplayName());
  
        for (Counters.Counter counter : group) {
          System.out.printf("\t\t%s: %s\n", counter.getDisplayName(),
                                            counter.getCounter());
        }
      }
      System.out.printf("\n");
    }
docs: Print this job counters (for debugging purpose)