Add OpenTelemetry observability to Arrtrix

- Add OTLP/gRPC observability config and resource attributes
- Instrument webhook and onboarding handlers with tracing and metrics
- Add OpenTelemetry dependencies to go.mod/go.sum
- Update NixOS modules to configure observability settings

modules/nixos/services/communication/matrix/default.nix

@@ -112,10 +112,9 @@ in {
       (mkMautrix "mautrix-telegram" 2 {})
       (mkMautrix "mautrix-whatsapp" 3 {})
       (mkMautrix "arrtrix" 4 {
-        settings.network.webhooks.radarr = {
-          enabled = true;
-          path = "/_arrtrix/webhooks/radarr";
-          secret = "";
+        settings.observability = {
+          otlp_grpc_endpoint = "http://[::1]:1000";
+          service_name = "arrtrix";
         };
       })
       {

modules/nixos/services/media/servarr/default.nix

@@ -212,6 +212,18 @@ in {
 
                   resource =
                     {
+                      "${service}_notification_webhook" = mkIf (lib.elem service ["radarr" "sonarr" "whisparr" "lidarr" "readarr"]) {
+                        "arrtrix" =
+                          {
+                            method = 1; # HTTP METHOD 1=POST, 2=PUT
+                            name = "Arrtrix";
+                            url = "http://[::1]${config'.services.arrtrix.settings.appservice.port}";
+                          }
+                          // (lib.optionalAttrs (lib.elem service ["radarr" "whisparr"]) {
+                            onMovieDelete = true;
+                          });
+                      };
+
                       "${service}_root_folder" = mkIf (lib.elem service ["radarr" "sonarr" "whisparr"]) (
                         rootFolders
                         |> lib.imap (i: f: lib.nameValuePair "local${toString i}" {path = f;})

modules/nixos/temp/services/arrtrix/default.nix

@@ -48,6 +48,11 @@
         time_format = " ";
       };
     };
+    observability = {
+      otlp_grpc_endpoint = "";
+      service_name = "arrtrix";
+      resource_attributes = {};
+    };
   };
 in {
   options.services.arrtrix = {