code: def retrieveVals(self):
          
          ntpinfo = NTPinfo()
          stats = ntpinfo.getPeerStats()
          if stats:
              if self.hasGraph('ntp_peer_stratum'):
                  self.setGraphVal('ntp_peer_stratum', 'stratum', 
                                   stats.get('stratum'))
              if self.hasGraph('ntp_peer_stats'):
                  self.setGraphVal('ntp_peer_stats', 'offset', 
                                   stats.get('offset'))
                  self.setGraphVal('ntp_peer_stats', 'delay', 
                                   stats.get('delay'))
                  self.setGraphVal('ntp_peer_stats', 'jitter', 
                                   stats.get('jitter'))
docs: Retrieve values for graphs.