New: Old/Obsolete Indexer Check

src/NzbDrone.Core/IndexerVersions/IndexerDefinitionUpdateService.cs

@@ -18,6 +18,7 @@ namespace NzbDrone.Core.IndexerVersions
     {
         List<CardigannMetaDefinition> All();
         CardigannDefinition GetDefinition(string fileKey);
+        List<string> GetBlacklist();
     }
 
     public class IndexerDefinitionUpdateService : IIndexerDefinitionUpdateService, IExecute<IndexerDefinitionUpdateCommand>
@@ -79,6 +80,11 @@ namespace NzbDrone.Core.IndexerVersions
             return definition;
         }
 
+        public List<string> GetBlacklist()
+        {
+            return _defintionBlacklist;
+        }
+
         private CardigannDefinition GetHttpDefinition(string id)
         {
             var req = new HttpRequest($"https://indexers.prowlarr.com/master/{DEFINITION_VERSION}/{id}");