code: def _set_prefixes(self, conf):
          
          if conf.get('legacy_namespace', 'y') in self.TRUE_VALUES:
              self.count_prefix = 'stats_counts'
              self.count_suffix = ''
              self.gauge_prefix = 'stats.gauges'
              self.timer_prefix = 'stats.timers'
              self.rate_prefix = 'stats'
              self.rate_suffix = ''
          else:
              global_prefix = conf.get('global_prefix', 'stats')
              self.count_prefix = '%s.%s' % (global_prefix,
                                             conf.get('prefix_counter',
                                                      'counters'))
              self.count_suffix = '.count'
              self.gauge_prefix = '%s.%s' % (global_prefix,
                                             conf.get('prefix_gauge', 'gauges'))
              self.timer_prefix = '%s.%s' % (global_prefix,
                                             conf.get('prefix_timer', 'timers'))
              self.rate_prefix = self.count_prefix
              self.rate_suffix = '.rate'
docs: Set the graphite key prefixes
  
          :param dict conf: The configuration data