diff --git a/internal/machine/docker/server.go b/internal/machine/docker/server.go
index cf0bf937..4cf4170b 100644
--- a/internal/machine/docker/server.go
+++ b/internal/machine/docker/server.go
@@ -192,5 +192,4 @@ func (s *Server) PullImage(req *pb.PullImageRequest, stream grpc.ServerStreaming
 			return status.Errorf(codes.Canceled, "pull image: %v", ctx.Err())
 		}
 	}
-
 }
diff --git a/internal/service/container.go b/internal/service/container.go
index e7b847d4..f90d771b 100644
--- a/internal/service/container.go
+++ b/internal/service/container.go
@@ -6,11 +6,13 @@ import (
 )
 
 const (
+	LabelManaged     = "uncloud.managed"
 	LabelServiceID   = "uncloud.service.id"
 	LabelServiceName = "uncloud.service.name"
 	LabelServiceMode = "uncloud.service.mode"
 )
 
+// TODO: move to api package.
 type Container struct {
 	types.Container
 }