code: def add_report(self, report, ignore_errors=False):
          
  
          if not isinstance(report, SignedListReport):
              if ignore_errors:
                  return
  
              raise ArgumentError("You can only add SignedListReports to a UTCAssigner", report=report)
  
          for reading in report.visible_readings:
              self.add_reading(reading)
  
          self.add_point(report.report_id, report.sent_timestamp, report.received_time)
docs: Add all anchors from a report.