Mapping `ArtistMetadataId` is needed for last/next monitored albums

src/Lidarr.Api.V1/Artist/ArtistController.cs

@@ -204,8 +204,10 @@ namespace Lidarr.Api.V1.Artist
 
         private void LinkNextPreviousAlbums(params ArtistResource[] artists)
         {
-            var nextAlbums = _albumService.GetNextAlbumsByArtistMetadataId(artists.Select(x => x.ArtistMetadataId));
-            var lastAlbums = _albumService.GetLastAlbumsByArtistMetadataId(artists.Select(x => x.ArtistMetadataId));
+            var artistMetadataIds = artists.Select(x => x.ArtistMetadataId).Distinct().ToList();
+
+            var nextAlbums = _albumService.GetNextAlbumsByArtistMetadataId(artistMetadataIds);
+            var lastAlbums = _albumService.GetLastAlbumsByArtistMetadataId(artistMetadataIds);
 
             foreach (var artistResource in artists)
             {

src/Lidarr.Api.V1/Artist/ArtistResource.cs

@@ -77,6 +77,7 @@ namespace Lidarr.Api.V1.Artist
             return new ArtistResource
             {
                 Id = model.Id,
+                ArtistMetadataId = model.ArtistMetadataId,
 
                 ArtistName = model.Name,