service/jellyfin: update metric patching

modules/services/jellyfin/default.nix

@@ -6,8 +6,15 @@ let
   port = 8096;
   # enable monitoring
   jellyfin-with-metrics = pkgs.jellyfin.overrideAttrs (attrs: {
-    # with this patch the default setting for metrics is changed
-    patches = attrs.patches ++ [ ./enable-metrics.patch ];
+    patches =
+      let
+        existingPatches =
+          if attrs ? patches && builtins.isList attrs.patches
+          then attrs.patches
+          else [ ];
+      in
+      # with this patch the default setting for metrics is changed
+      existingPatches ++ [ ./enable-metrics.patch ];
   });
 in
 {

modules/services/jellyfin/enable-metrics.patch

@@ -1,13 +1,13 @@
 diff --git a/MediaBrowser.Model/Configuration/ServerConfiguration.cs b/MediaBrowser.Model/Configuration/ServerConfiguration.cs
-index 07f02d1879..0f1c2e0cb8 100644
+index 52f7e53b81..b149e3251a 100644
 --- a/MediaBrowser.Model/Configuration/ServerConfiguration.cs
 +++ b/MediaBrowser.Model/Configuration/ServerConfiguration.cs
-@@ -66,7 +66,7 @@ namespace MediaBrowser.Model.Configuration
-         /// <summary>
-         /// Gets or sets a value indicating whether to enable prometheus metrics exporting.
-         /// </summary>
--        public bool EnableMetrics { get; set; } = false;
-+        public bool EnableMetrics { get; set; } = true;
+@@ -67,7 +67,7 @@ public class ServerConfiguration : BaseApplicationConfiguration
+     /// <summary>
+     /// Gets or sets a value indicating whether to enable prometheus metrics exporting.
+     /// </summary>
+-    public bool EnableMetrics { get; set; } = false;
++    public bool EnableMetrics { get; set; } = true;
  
-         public bool EnableNormalizedItemByNameIds { get; set; } = true;
+     public bool EnableNormalizedItemByNameIds { get; set; } = true;