[AspNetCore] Add schema URL to traces

src/OpenTelemetry.Instrumentation.AspNetCore/AspNetCoreInstrumentationTracerProviderBuilderExtensions.cs

@@ -122,7 +122,7 @@ private static void AddAspNetCoreInstrumentationSources(
         }
         else
         {
-            builder.AddSource(HttpInListener.ActivitySourceName);
+            builder.AddSource(HttpInListener.ActivitySource.Name);
             builder.AddLegacySource(HttpInListener.ActivityOperationName); // for the activities created by AspNetCore
         }
 

src/OpenTelemetry.Instrumentation.AspNetCore/CHANGELOG.md

@@ -11,6 +11,9 @@
 * Fix `http.route` for the root path for Razor Pages.
   ([#4016](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4016))
 
+* Add instrumentation schema URL to traces for `netstandard2.0`.
+  ([#4066](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4066))
+
 ## 1.15.1
 
 Released 2026-Mar-11

src/OpenTelemetry.Instrumentation.AspNetCore/Implementation/HttpInListener.cs

@@ -3,7 +3,6 @@
 
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
-using System.Reflection;
 using System.Runtime.CompilerServices;
 using Microsoft.AspNetCore.Http;
 using OpenTelemetry.Context.Propagation;
@@ -23,12 +22,7 @@ internal class HttpInListener : ListenerHandler
     // https://github.com/dotnet/aspnetcore/blob/8d6554e655b64da75b71e0e20d6db54a3ba8d2fb/src/Hosting/Hosting/src/GenericHost/GenericWebHostBuilder.cs#L85
     internal const string AspNetCoreActivitySourceName = "Microsoft.AspNetCore";
 
-    internal static readonly AssemblyName AssemblyName = typeof(HttpInListener).Assembly.GetName();
-#pragma warning disable IDE0370 // Suppression is unnecessary
-    internal static readonly string ActivitySourceName = AssemblyName.Name!;
-    internal static readonly Version Version = AssemblyName.Version!;
-#pragma warning restore IDE0370 // Suppression is unnecessary
-    internal static readonly ActivitySource ActivitySource = new(ActivitySourceName, Version.ToString());
+    internal static readonly ActivitySource ActivitySource = CreateActivitySource();
     internal static readonly bool Net7OrGreater = Environment.Version.Major >= 7;
 
     private const string DiagnosticSourceName = "Microsoft.AspNetCore";
@@ -394,4 +388,24 @@ private static void AddGrpcAttributes(Activity activity, string grpcMethod, Http
             }
         }
     }
+
+    private static ActivitySource CreateActivitySource()
+    {
+        const string telemetrySchemaUrl = "https://opentelemetry.io/schemas/1.40.0";
+
+        var assembly = typeof(HttpInListener).Assembly;
+        var assemblyName = assembly.GetName();
+#pragma warning disable IDE0370 // Suppression is unnecessary
+        var name = assemblyName.Name!;
+#pragma warning restore IDE0370 // Suppression is unnecessary
+        var version = assembly.GetPackageVersion();
+
+        var activitySourceOptions = new ActivitySourceOptions(name)
+        {
+            TelemetrySchemaUrl = telemetrySchemaUrl,
+            Version = version,
+        };
+
+        return new ActivitySource(activitySourceOptions);
+    }
 }

src/OpenTelemetry.Instrumentation.AspNetCore/OpenTelemetry.Instrumentation.AspNetCore.csproj

@@ -13,15 +13,16 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <Compile Include="$(RepoRoot)\src\Shared\Configuration\*.cs" Link="Includes\Configuration\%(Filename).cs" />
-    <Compile Include="$(RepoRoot)\src\Shared\EnvironmentVariables\*.cs" Link="Includes\EnvironmentVariables\%(Filename).cs" Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'" />
-    <Compile Include="$(RepoRoot)\src\Shared\GrpcTagHelper.cs" Link="Includes\GrpcTagHelper.cs" />
-    <Compile Include="$(RepoRoot)\src\Shared\GrpcStatusCanonicalCode.cs" Link="Includes\GrpcStatusCanonicalCode.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\ActivityHelperExtensions.cs" Link="Includes\ActivityHelperExtensions.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\ActivityInstrumentationHelper.cs" Link="Includes\ActivityInstrumentationHelper.cs" />
-    <Compile Include="$(RepoRoot)\src\Shared\ExceptionExtensions.cs" Link="Includes\ExceptionExtensions.cs" />
+    <Compile Include="$(RepoRoot)\src\Shared\AssemblyVersionExtensions.cs" Link="Includes\AssemblyVersionExtensions.cs" />
+    <Compile Include="$(RepoRoot)\src\Shared\Configuration\*.cs" Link="Includes\Configuration\%(Filename).cs" />
     <Compile Include="$(RepoRoot)\src\Shared\DiagnosticSourceListener.cs" Link="Includes\DiagnosticSourceListener.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\DiagnosticSourceSubscriber.cs" Link="Includes\DiagnosticSourceSubscriber.cs" />
+    <Compile Include="$(RepoRoot)\src\Shared\EnvironmentVariables\*.cs" Link="Includes\EnvironmentVariables\%(Filename).cs" Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'" />
+    <Compile Include="$(RepoRoot)\src\Shared\ExceptionExtensions.cs" Link="Includes\ExceptionExtensions.cs" />
+    <Compile Include="$(RepoRoot)\src\Shared\GrpcTagHelper.cs" Link="Includes\GrpcTagHelper.cs" />
+    <Compile Include="$(RepoRoot)\src\Shared\GrpcStatusCanonicalCode.cs" Link="Includes\GrpcStatusCanonicalCode.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\Guard.cs" Link="Includes\Guard.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\ListenerHandler.cs" Link="Includes\ListenerHandler.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\NullableAttributes.cs" Link="Includes\NullableAttributes.cs" />

test/OpenTelemetry.Instrumentation.AspNetCore.Tests/BasicTests.cs

@@ -725,7 +725,6 @@ public async Task ActivitiesStartedInMiddlewareBySettingHostActivityToNullShould
         Assert.Equal("Microsoft.AspNetCore.Hosting.HttpRequestIn", aspnetcoreframeworkactivity.OperationName);
     }
 
-#if NET
     [Fact]
     public async Task UserRegisteredActivitySourceIsUsedForActivityCreationByAspNetCore()
     {
@@ -766,7 +765,6 @@ void ConfigureTestServices(IServiceCollection services)
 
         Assert.Equal("UserRegisteredActivitySource", activity.Source.Name);
     }
-#endif
 
     [Theory]
     [InlineData(1)]
@@ -1332,14 +1330,9 @@ private static void WaitForActivityExport(List<Activity> exportedItems, int coun
     private static void ValidateAspNetCoreActivity(Activity activityToValidate, string expectedHttpPath)
     {
         Assert.Equal(ActivityKind.Server, activityToValidate.Kind);
-#if NET
         Assert.Equal(HttpInListener.AspNetCoreActivitySourceName, activityToValidate.Source.Name);
         Assert.NotNull(activityToValidate.Source.Version);
         Assert.Empty(activityToValidate.Source.Version);
-#else
-        Assert.Equal(HttpInListener.ActivitySourceName, activityToValidate.Source.Name);
-        Assert.Equal(HttpInListener.Version.ToString(), activityToValidate.Source.Version);
-#endif
         Assert.Equal(expectedHttpPath, activityToValidate.GetTagValue(SemanticConventions.AttributeUrlPath) as string);
     }
 

test/OpenTelemetry.Instrumentation.AspNetCore.Tests/MetricTests.cs

@@ -1,22 +1,13 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#if NET
 using System.Threading.RateLimiting;
 using Microsoft.AspNetCore.Builder;
-#endif
 using Microsoft.AspNetCore.Hosting;
-#if NET
 using Microsoft.AspNetCore.Http;
-#endif
 using Microsoft.AspNetCore.Mvc.Testing;
-#if NET
 using Microsoft.AspNetCore.RateLimiting;
-#endif
-#if NET
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-#endif
 using Microsoft.Extensions.Logging;
 using OpenTelemetry.Metrics;
 using OpenTelemetry.Trace;
@@ -38,7 +29,6 @@ public void AddAspNetCoreInstrumentation_BadArgs()
         Assert.Throws<ArgumentNullException>(builder!.AddAspNetCoreInstrumentation);
     }
 
-#if NET
     [Fact]
     public async Task ValidateNetMetricsAsync()
     {
@@ -178,7 +168,6 @@ static string GetTicks()
 
         await app.DisposeAsync();
     }
-#endif
 
     [Theory]
     [InlineData("/api/values/2", "api/Values/{id}", null, 200)]

test/OpenTelemetry.Instrumentation.AspNetCore.Tests/RouteTests/TestApplication/TestApplicationFactory.cs

@@ -129,11 +129,9 @@ private static WebApplication CreateMinimalApiApplication()
         app.MapGet("/MinimalApi", () => Results.Ok());
         app.MapGet("/MinimalApi/{id}", (int id) => Results.Ok());
 
-#if NET
         var api = app.MapGroup("/MinimalApiUsingMapGroup");
         api.MapGet("/", () => Results.Ok());
         api.MapGet("/{id}", (int id) => Results.Ok());
-#endif
 
         return app;
     }