code: def resolve_group_to_version(self, name, value=None):
          
          if name not in self.current_rg:
              return name
  
          routing_group = self.current_rg[name]
          if len(routing_group) == 0:
              self.logger.warning("empty rounting group %s", name)
              return name
  
          value = value or random.randint(0, 1 << 32)
          index = upper_bound(routing_group, value)
          return routing_group[index if index < len(routing_group) else 0][1]
docs: Pick a version from a routing group using a random or provided value
              A routing group looks like (weight, version):
              {"APP": [[29431330, 'A'], [82426238, 'B'], [101760716, 'C'], [118725487, 'D'], [122951927, 'E']]}