code: func getLogDogAnnotationAddr(c context.Context, build *buildbot.Build) (*types.StreamAddr, error) {
  	if v, ok := build.PropertyValue("log_location").(string); ok && v != "" {
  		return types.ParseURL(v)
  	}
  	return nil, grpcutil.Errf(codes.NotFound, "annotation stream not found")
  }
docs: // Resolve LogDog annotation stream for this build.