code: func (r *Rotation) PhaseDescription() string {
  	switch r.Phase {
  	case RotationPhaseInit:
  		return "initialized"
  	case RotationPhaseStandby, "":
  		return "on standby"
  	case RotationPhaseUpdateClients:
  		return "rotating clients"
  	case RotationPhaseUpdateServers:
  		return "rotating servers"
  	case RotationPhaseRollback:
  		return "rolling back"
  	default:
  		return fmt.Sprintf("unknown phase: %q", r.Phase)
  	}
  }
docs: // PhaseDescription returns human friendly description of a current rotation phase.