code: func BlamelistRepoWhiteset(notifications notifypb.Notifications) stringset.Set {
  	whiteset := stringset.New(0)
  	for _, notification := range notifications.GetNotifications() {
  		blamelistInfo := notification.GetNotifyBlamelist()
  		for _, repo := range blamelistInfo.GetRepositoryWhitelist() {
  			whiteset.Add(repo)
  		}
  	}
  	return whiteset
  }
docs: // BlamelistRepoWhiteset computes the aggregate repository whitelist for all
  // blamelist notification configurations in a given set of notifications.