code: private NodeUsageReport getReportUnprotected(String trackerName) {
      NodeUsageReport usageReport = usageReports.get(trackerName);
      if (usageReport == null) {
        usageReport = new NodeUsageReport(trackerName, 0, 0, 0, 0, 0, 0, 0);
        usageReports.put(trackerName, usageReport);
      }
      return usageReport;
    }
docs: Get the usage report for a tracker.
  @param trackerName The name of the tracker.
  @return The {@link NodeUsageReport} for the tracker.