feat: use simplified meter creation.

Game/Game/GameServiceSource.cs

@@ -35,6 +35,6 @@ public partial class GameServiceSource : RootServiceSource
     {
         serviceCollection.AddObservability(builder => builder
             .AddGrpcExporter("http://localhost:4317")
-            .AddMeterName(MetricsHandler.MeterName));
+            .AddMeterName());
     }
 }

Game/Metrics/MetricsHandler.cs

@@ -1,32 +1,20 @@
 using System;
 using System.Diagnostics.Metrics;
-using System.Reflection;
 using GodotHostTest.Interfaces;
 using OwofGames.GodotHost;
+using OwofGames.GodotHost.Observability;
 using R3;
 
 namespace GodotHostTest.Game.Metrics;
 
 public class MetricsHandler(IMeterFactory meterFactory, ITargetEventBus targetEventBus) : IHostLifetime
 {
-    public static readonly string MeterName;
-    private static readonly string? MeterVersion;
     private IDisposable? _disposables;
 
-    static MetricsHandler()
-    {
-        var assemblyName = Assembly.GetExecutingAssembly().GetName();
-        MeterName = assemblyName.Name!;
-        MeterVersion = assemblyName.Version?.ToString();
-    }
-
     public void Startup()
     {
         // create meter
-        var assemblyName = Assembly.GetExecutingAssembly().GetName();
-        var meterName = assemblyName.Name!;
-        var meterVersion = assemblyName.Version?.ToString();
-        var meter = meterFactory.Create(meterName, meterVersion);
+        var meter = meterFactory.Create();
 
         // create instruments
         var hitTargetsCounter =