set transformer annotation when the option is specified

api/internal/target/multitransformer.go

@@ -9,15 +9,15 @@ import (
 
 // multiTransformer contains a list of transformers.
 type multiTransformer struct {
-	transformers []resmap.Transformer
+	transformers []*resmap.TransformerWithProperties
 }
 
 var _ resmap.Transformer = &multiTransformer{}
 
 // newMultiTransformer constructs a multiTransformer.
-func newMultiTransformer(t []resmap.Transformer) resmap.Transformer {
+func newMultiTransformer(t []*resmap.TransformerWithProperties) resmap.Transformer {
 	r := &multiTransformer{
-		transformers: make([]resmap.Transformer, len(t)),
+		transformers: make([]*resmap.TransformerWithProperties, len(t)),
 	}
 	copy(r.transformers, t)
 	return r
@@ -30,6 +30,11 @@ func (o *multiTransformer) Transform(m resmap.ResMap) error {
 		if err := t.Transform(m); err != nil {
 			return err
 		}
+		if t.Origin != nil {
+			if err := m.AddTransformerAnnotation(t.Origin); err != nil {
+				return err
+			}
+		}
 		m.DropEmpties()
 	}
 	return nil