feat: adapt to enabled observability features.

Game/Metrics/MetricsHandler.cs

@@ -1,18 +1,29 @@
 using System;
 using System.Diagnostics.Metrics;
 using GodotHostTest.Interfaces;
+using Microsoft.Extensions.Logging;
 using OwofGames.GodotHost;
 using OwofGames.GodotHost.Observability;
+using OwofGames.GodotLume;
 using R3;
 
 namespace GodotHostTest.Game.Metrics;
 
-public class MetricsHandler(IMeterFactory meterFactory, ITargetEventBus targetEventBus) : IHostLifetime
+public class MetricsHandler(
+    ILogger<MetricsHandler> logger,
+    IOptional<IMeterFactory> meterFactoryWrapper,
+    ITargetEventBus targetEventBus) : IHostLifetime
 {
     private IDisposable? _disposables;
 
     public void Startup()
     {
+        if (!meterFactoryWrapper.TryGet(out var meterFactory))
+        {
+            logger.LogWarning("Metrics not enabled, cannot start local metrics");
+            return;
+        }
+
         // create meter
         var meter = meterFactory.Create();
 
@@ -33,6 +44,5 @@ public class MetricsHandler(IMeterFactory meterFactory, ITargetEventBus targetEv
     public void Shutdown()
     {
         _disposables?.Dispose();
-        meterFactory.Create("godot-host-test")?.Dispose();
     }
 }