feat: hooking observability.

Game/Level/LevelServiceSource.cs

@@ -1,3 +1,5 @@
+using System;
+using System.Diagnostics;
 using Godot;
 using GodotHostTest.AetherBind;
 using GodotHostTest.Game.Target;
@@ -19,8 +21,13 @@ public partial class LevelServiceSource : ServiceSource
 
     [WithProvider]
     private void OnScopeCreated(IValueSetter<ITargetCollector> targetCollector,
-        IValueSetter<ITargetSpawner> targetSpawner)
+        IValueSetter<ITargetSpawner> targetSpawner, ActivitySource activitySource, IValueSetter<Activity> activity)
     {
+        // ReSharper disable once ExplicitCallerInfoArgument - the caller name is not significant in this case
+        var activityValue = activitySource.StartActivity("Level") ??
+                            throw new InvalidOperationException(
+                                "No listeners for the activity - is OpenTelemetry running?");
+        activity.Set(activityValue);
         targetCollector.Set(_targetSpawner);
         targetSpawner.Set(_targetSpawner);
     }