Add TelemetryApplicationMetricsContributor for app metrics tracking.

framework/src/Volo.Abp.AspNetCore.Mvc/Volo/Abp/AspNetCore/Mvc/TelemetryApplicationMetricsContributor.cs

@@ -0,0 +1,35 @@
+using System.Reflection;
+using System.Threading.Tasks;
+using Volo.Abp.Application.Services;
+using Volo.Abp.DependencyInjection;
+using Volo.Abp.Telemetry;
+using Volo.Abp.Telemetry.Activity;
+using Volo.Abp.Telemetry.Constants;
+using System.Linq;
+
+namespace Volo.Abp.AspNetCore.Mvc;
+
+[ExposeServices(typeof(ITelemetryApplicationInfoContributor))]
+public class TelemetryApplicationMetricsContributor : ITelemetryApplicationInfoContributor, ISingletonDependency
+{
+    public Task ContributeAsync(ActivityData activityData)
+    {
+        if (activityData.TryGetValue(ActivityPropertyNames.Assembly, out var assemblyPath))
+        {
+            var assembly = Assembly.LoadFrom((string)assemblyPath);
+            var types = assembly.GetTypes();
+
+            var appServiceCount = types.Count(t =>
+                typeof(IApplicationService).IsAssignableFrom(t) &&
+                t is { IsAbstract: false, IsInterface: false });
+
+            var controllerCount = types.Count(t =>
+                typeof(AbpController).IsAssignableFrom(t) &&
+                !t.IsAbstract);
+
+            activityData[ActivityPropertyNames.AppServiceCount] = appServiceCount;
+            activityData[ActivityPropertyNames.ControllerCount] = controllerCount;
+        }
+        return Task.CompletedTask;
+    }
+}