code: func getBlameLegacy(c context.Context, msg *bbv1.ApiCommonBuildMessage) []*ui.Commit {
  	host, err := getHost(c)
  	if err != nil {
  		return []*ui.Commit{{
  			Description: fmt.Sprintf("Failed to fetch blame information\n%s", err.Error()),
  		}}
  	}
  	tags := strpair.ParseMap(msg.Tags)
  	bSet, _ := tags["buildset"]
  	bid := NewBuilderID(msg.Bucket, tags.Get("builder"))
  	bs := &model.BuildSummary{
  		BuildKey:  MakeBuildKey(c, host, tags.Get("build_address")),
  		BuildSet:  bSet,
  		BuilderID: bid.String(),
  	}
  	blame, err := simplisticBlamelist(c, bs)
  	if err != nil {
  		logging.WithError(err).Warningf(c, "getting blamelist")
  	}
  	return blame
  }
docs: // getBlameLegacy fetches blame information from Gitiles.  This requires the
  // BuildSummary to be indexed in Milo.