feat: adapt to enabled observability features.

Game/Level/LevelServiceSource.cs

@@ -4,6 +4,7 @@ using Godot;
 using GodotHostTest.AetherBind;
 using GodotHostTest.Game.Target;
 using GodotHostTest.Interfaces;
+using Microsoft.Extensions.Logging;
 using OwofGames.AetherBind;
 using OwofGames.GodotHost.Observability;
 using OwofGames.GodotLume;
@@ -23,13 +24,18 @@ public partial class LevelServiceSource : ServiceSource
     }
 
     [WithProvider]
-    private void OnScopeCreated(IActivitySourceFactory activitySourceFactory,
+    private void OnScopeCreated(ILogger<LevelServiceSource> logger,
+        IOptional<IActivitySourceFactory> activitySourceFactoryWrapper,
         IValueSetter<ITargetCollector> targetCollector, IValueSetter<ITargetSpawner> targetSpawner)
     {
-        // ReSharper disable once ExplicitCallerInfoArgument - the caller name is not significant in this case
-        _levelActivity = activitySourceFactory.ActivitySource.StartActivity("Level") ??
-                         throw new InvalidOperationException(
-                             "No listeners for the activity - is OpenTelemetry running?");
+        if (activitySourceFactoryWrapper.TryGet(out var activitySourceFactory))
+            // ReSharper disable once ExplicitCallerInfoArgument - the caller name is not significant in this case
+            _levelActivity = activitySourceFactory.ActivitySource.StartActivity("Level") ??
+                             throw new InvalidOperationException(
+                                 "No listeners for the activity - is OpenTelemetry running?");
+        else
+            logger.LogWarning("Tracing not enabled, cannot start the activity.");
+
         targetCollector.Set(_targetSpawner);
         targetSpawner.Set(_targetSpawner);
     }
@@ -37,6 +43,6 @@ public partial class LevelServiceSource : ServiceSource
     public override void _Ready()
     {
         // after 3 seconds, dispose the activity for simulation purposes
-        GetTree().CreateTimer(3).Timeout += _levelActivity!.Dispose;
+        GetTree().CreateTimer(3).Timeout += () => _levelActivity?.Dispose();
     }
 }