code: def retrieveVals(self):
             
          nginxInfo = NginxInfo(self._host, self._port,
                                  self._user, self._password, 
                                  self._statuspath, self._ssl)
          stats = nginxInfo.getServerStats()
          if stats:
              if self.hasGraph('nginx_activeconn'):
                  self.setGraphVal('nginx_activeconn', 'proc', stats['writing'])
                  self.setGraphVal('nginx_activeconn', 'read', stats['reading'])
                  self.setGraphVal('nginx_activeconn', 'wait', stats['waiting'])
                  self.setGraphVal('nginx_activeconn', 'total', 
                                   stats['connections'])
              if self.hasGraph('nginx_connections'):
                  self.setGraphVal('nginx_connections', 'handled', stats['handled'])
                  self.setGraphVal('nginx_connections', 'nothandled', 
                                   stats['accepts'] - stats['handled'])
              if self.hasGraph('nginx_requests'):
                  self.setGraphVal('nginx_requests', 'requests', stats['requests'])
              if self.hasGraph('nginx_requestsperconn'):
                  curr_stats = (stats['handled'], stats['requests'])
                  hist_stats = self.restoreState()
                  if hist_stats:
                      prev_stats = hist_stats[0]
                  else:
                      hist_stats = []
                      prev_stats = (0,0)
                  conns = max(curr_stats[0] - prev_stats[0], 0)
                  reqs = max(curr_stats[1] - prev_stats[1], 0)
                  if conns > 0:
                      self.setGraphVal('nginx_requestsperconn', 'requests',
                                       float(reqs) / float(conns))
                  else:
                      self.setGraphVal('nginx_requestsperconn', 'requests', 0)
                  hist_stats.append(curr_stats)
                  self.saveState(hist_stats[-self._numSamples:])
docs: Retrieve values for graphs.