Fix image prune events for containerd backend

Ensure events for containerd backend are properly sent when deleted via
image prune. Fix prune output to only show deleted images rather than
the deletion of each blob.

Signed-off-by: Derek McGowan <derek@mcg.dev>

daemon/containerd/image_prune.go

@@ -12,12 +12,14 @@ import (
 	cerrdefs "github.com/containerd/errdefs"
 	"github.com/containerd/log"
 	"github.com/distribution/reference"
+	"github.com/moby/moby/api/types/events"
 	"github.com/moby/moby/api/types/filters"
 	"github.com/moby/moby/api/types/image"
-	"github.com/moby/moby/v2/daemon/container"
-	"github.com/moby/moby/v2/errdefs"
 	"github.com/opencontainers/go-digest"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+
+	"github.com/moby/moby/v2/daemon/container"
+	"github.com/moby/moby/v2/errdefs"
 )
 
 var imagesAcceptedFilters = map[string]bool{
@@ -243,25 +245,34 @@ func (i *ImageService) pruneAll(ctx context.Context, imagesToPrune map[string]c8
 			continue
 		}
 
+		familiarName := imageFamiliarName(img)
+		i.logImageEvent(img, familiarName, events.ActionUnTag)
 		report.ImagesDeleted = append(report.ImagesDeleted,
 			image.DeleteResponse{
-				Untagged: imageFamiliarName(img),
+				Untagged: familiarName,
 			},
 		)
 
+		var deleted bool
 		// Check which blobs have been deleted and sum their sizes
 		for _, blob := range blobs {
 			_, err := i.content.ReaderAt(ctx, blob)
 
 			if cerrdefs.IsNotFound(err) {
-				report.ImagesDeleted = append(report.ImagesDeleted,
-					image.DeleteResponse{
-						Deleted: blob.Digest.String(),
-					},
-				)
+				if c8dimages.IsManifestType(blob.MediaType) || c8dimages.IsIndexType(blob.MediaType) {
+					deleted = true
+					report.ImagesDeleted = append(report.ImagesDeleted,
+						image.DeleteResponse{
+							Deleted: blob.Digest.String(),
+						},
+					)
+				}
 				report.SpaceReclaimed += uint64(blob.Size)
 			}
 		}
+		if deleted {
+			i.logImageEvent(img, familiarName, events.ActionDelete)
+		}
 	}
 
 	return &report, errors.Join(errs...)