code: func (m *Manager) setJitterSeed(labels labels.Labels) error {
  	h := fnv.New64a()
  	hostname, err := getFqdn()
  	if err != nil {
  		return err
  	}
  	if _, err := fmt.Fprintf(h, "%s%s", hostname, labels.String()); err != nil {
  		return err
  	}
  	m.jitterSeed = h.Sum64()
  	return nil
  }
docs: // setJitterSeed calculates a global jitterSeed per server relying on extra label set.