code: func NewProtoBackend(b *APIBackend) *ProtoBackend {
  	return &ProtoBackend{
  		Logger:       b.Logger.With(zap.String("handler", "proto")),
  		ProtoService: b.ProtoService,
  		LabelService: b.LabelService,
  	}
  }
docs: // NewProtoBackend creates an instance of the Protobackend from the APIBackend.