Add ASP.NET Core telemetry metrics and traces for .NET 10

src/OpenTelemetry.Instrumentation.AspNetCore/.publicApi/PublicAPI.Unshipped.txt

@@ -0,0 +1,2 @@
+OpenTelemetry.Instrumentation.AspNetCore.AspNetCoreTraceInstrumentationOptions.EnableBlazorSupport.get -> bool
+OpenTelemetry.Instrumentation.AspNetCore.AspNetCoreTraceInstrumentationOptions.EnableBlazorSupport.set -> void

src/OpenTelemetry.Instrumentation.AspNetCore/AspNetCoreInstrumentationMeterProviderBuilderExtensions.cs

@@ -49,6 +49,13 @@ internal static MeterProviderBuilder ConfigureMeters(this MeterProviderBuilder b
              .AddMeter("Microsoft.AspNetCore.Http.Connections")
              .AddMeter("Microsoft.AspNetCore.Routing")
              .AddMeter("Microsoft.AspNetCore.Diagnostics")
-             .AddMeter("Microsoft.AspNetCore.RateLimiting");
+             .AddMeter("Microsoft.AspNetCore.RateLimiting")
+             .AddMeter("Microsoft.AspNetCore.Components")
+             .AddMeter("Microsoft.AspNetCore.Components.Server.Circuits")
+             .AddMeter("Microsoft.AspNetCore.Components.Lifecycle")
+             .AddMeter("Microsoft.AspNetCore.Authorization")
+             .AddMeter("Microsoft.AspNetCore.Authentication")
+             .AddMeter("Microsoft.AspNetCore.Identity")
+             .AddMeter("Microsoft.AspNetCore.MemoryPool");
     }
 }

src/OpenTelemetry.Instrumentation.AspNetCore/AspNetCoreInstrumentationTracerProviderBuilderExtensions.cs

@@ -126,15 +126,26 @@ private static void AddAspNetCoreInstrumentationSources(
             builder.AddLegacySource(HttpInListener.ActivityOperationName); // for the activities created by AspNetCore
         }
 
+        var options = serviceProvider?.GetRequiredService<IOptionsMonitor<AspNetCoreTraceInstrumentationOptions>>().Get(optionsName);
+
         // SignalR activities first added in .NET 9.0
         if (Environment.Version.Major >= 9)
         {
-            var options = serviceProvider?.GetRequiredService<IOptionsMonitor<AspNetCoreTraceInstrumentationOptions>>().Get(optionsName);
             if (options is null || options.EnableAspNetCoreSignalRSupport)
             {
                 // https://github.com/dotnet/aspnetcore/blob/6ae3ea387b20f6497b82897d613e9b8a6e31d69c/src/SignalR/server/Core/src/Internal/SignalRServerActivitySource.cs#L13C35-L13C70
                 builder.AddSource("Microsoft.AspNetCore.SignalR.Server");
             }
         }
+
+        // Blazor activities first added in .NET 10.0
+        if (Environment.Version.Major >= 10)
+        {
+            if (options is null || options.EnableBlazorSupport)
+            {
+                builder.AddSource("Microsoft.AspNetCore.Components");
+                builder.AddSource("Microsoft.AspNetCore.Components.Server.Circuits");
+            }
+        }
     }
 }

src/OpenTelemetry.Instrumentation.AspNetCore/AspNetCoreTraceInstrumentationOptions.cs

@@ -102,6 +102,15 @@ internal AspNetCoreTraceInstrumentationOptions(IConfiguration configuration)
     /// </remarks>
     public bool EnableAspNetCoreSignalRSupport { get; set; } = true;
 
+    /// <summary>
+    /// Gets or sets a value indicating whether Blazor activities are recorded.
+    /// </summary>
+    /// <remarks>
+    /// Defaults to true.
+    /// Only applies to .NET 10.0 or greater.
+    /// </remarks>
+    public bool EnableBlazorSupport { get; set; } = true;
+
     /// <summary>
     /// Gets or sets a value indicating whether RPC attributes are added to an Activity when using Grpc.AspNetCore.
     /// </summary>

src/OpenTelemetry.Instrumentation.AspNetCore/CHANGELOG.md

@@ -2,6 +2,57 @@
 
 ## Unreleased
 
+* Added support for listening to ASP.NET Core Blazor activities.
+  Configurable with the
+  `AspNetCoreTraceInstrumentationOptions.EnableBlazorSupport`
+  option which defaults to `true`. Only applies to .NET 10.0 or greater.
+  ([#3012](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/3012))
+
+* Following metrics will now be enabled by default when targeting `.NET10.0` or
+  newer framework:
+
+  * **Meter** : `Microsoft.AspNetCore.MemoryPool`
+    * `aspnetcore.memory_pool.pooled`
+    * `aspnetcore.memory_pool.evicted`
+    * `aspnetcore.memory_pool.allocated`
+    * `aspnetcore.memory_pool.rented`
+  * **Meter** : `Microsoft.AspNetCore.Authentication`
+    * `aspnetcore.authentication.authenticate.duration`
+    * `aspnetcore.authentication.challenges`
+    * `aspnetcore.authentication.forbids`
+    * `aspnetcore.authentication.sign_ins`
+    * `aspnetcore.authentication.sign_outs`
+  * **Meter** : `Microsoft.AspNetCore.Authorization`
+    * `aspnetcore.authorization.attempts`
+  * **Meter** : `Microsoft.AspNetCore.Identity`
+    * `aspnetcore.identity.user.create.duration`
+    * `aspnetcore.identity.user.update.duration`
+    * `aspnetcore.identity.user.delete.duration`
+    * `aspnetcore.identity.user.check_password_attempts`
+    * `aspnetcore.identity.user.generated_tokens`
+    * `aspnetcore.identity.user.verify_token_attempts`
+    * `aspnetcore.identity.sign_in.authenticate.duration`
+    * `aspnetcore.identity.sign_in.check_password_attempts`
+    * `aspnetcore.identity.sign_in.sign_ins`
+    * `aspnetcore.identity.sign_in.sign_outs`
+    * `aspnetcore.identity.sign_in.two_factor_clients_remembered`
+    * `aspnetcore.identity.sign_in.two_factor_clients_forgotten`
+  * **Meter** : `Microsoft.AspNetCore.Components`
+    * `aspnetcore.components.navigate`
+    * `aspnetcore.components.handle_event.duration`
+  * **Meter** : `Microsoft.AspNetCore.Components.Lifecycle`
+    * `aspnetcore.components.update_parameters.duration`
+    * `aspnetcore.components.render_diff.duration`
+    * `aspnetcore.components.render_diff.size`
+  * **Meter** : `Microsoft.AspNetCore.Components.Server.Circuits`
+    * `aspnetcore.components.circuit.active`
+    * `aspnetcore.components.circuit.connected`
+    * `aspnetcore.components.circuit.duration`
+
+  For details about each individual metric check [ASP.NET Core
+  docs
+  page](https://learn.microsoft.com/dotnet/core/diagnostics/built-in-metrics-aspnetcore).
+
 ## 1.12.0
 
 Released 2025-May-05