[AspNetCore] Update gRPC Semantic Conventions

opentelemetry-dotnet-contrib.slnx

@@ -205,6 +205,7 @@
     <File Path="src/Shared/RedactionHelper.cs" />
     <File Path="src/Shared/RequestDataHelper.cs" />
     <File Path="src/Shared/ResourceSemanticConventions.cs" />
+    <File Path="src/Shared/RpcSemanticConventionHelper.cs" />
     <File Path="src/Shared/SemanticConventions.cs" />
     <File Path="src/Shared/ServerCertificateValidationHandler.cs" />
     <File Path="src/Shared/ServerCertificateValidationProvider.cs" />

src/OpenTelemetry.Instrumentation.AspNetCore/AspNetCoreTraceInstrumentationOptions.cs

@@ -5,6 +5,7 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Configuration;
 using OpenTelemetry.Instrumentation.AspNetCore.Implementation;
+using static OpenTelemetry.Internal.RpcSemanticConventionHelper;
 
 namespace OpenTelemetry.Instrumentation.AspNetCore;
 
@@ -38,6 +39,10 @@ internal AspNetCoreTraceInstrumentationOptions(IConfiguration configuration)
         {
             this.DisableUrlQueryRedaction = disableUrlQueryRedaction;
         }
+
+        var rpcSemanticConvention = GetSemanticConventionOptIn(configuration);
+        this.EmitOldRpcAttributes = rpcSemanticConvention.HasFlag(RpcSemanticConvention.Old);
+        this.EmitNewRpcAttributes = rpcSemanticConvention.HasFlag(RpcSemanticConvention.New);
     }
 
     /// <summary>
@@ -115,7 +120,7 @@ internal AspNetCoreTraceInstrumentationOptions(IConfiguration configuration)
     /// Gets or sets a value indicating whether RPC attributes are added to an Activity when using Grpc.AspNetCore.
     /// </summary>
     /// <remarks>
-    /// https://github.com/open-telemetry/semantic-conventions/blob/main/docs/rpc/rpc-spans.md.
+    /// https://github.com/open-telemetry/semantic-conventions/blob/v1.41.0/docs/rpc/rpc-spans.md.
     /// </remarks>
     internal bool EnableGrpcAspNetCoreSupport { get; set; }
 
@@ -128,4 +133,14 @@ internal AspNetCoreTraceInstrumentationOptions(IConfiguration configuration)
     /// The redaction can be disabled by setting this property to <see langword="true" />.
     /// </remarks>
     internal bool DisableUrlQueryRedaction { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the old RPC attributes should be emitted.
+    /// </summary>
+    internal bool EmitOldRpcAttributes { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the new RPC attributes should be emitted.
+    /// </summary>
+    internal bool EmitNewRpcAttributes { get; set; }
 }

src/OpenTelemetry.Instrumentation.AspNetCore/CHANGELOG.md

@@ -14,6 +14,11 @@
 * Fix enrich methods being called multiple times.
   ([#4015](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4015))
 
+* Add support for version [1.41.0](https://github.com/open-telemetry/semantic-conventions/blob/v1.41.0/docs/rpc/README.md)
+  of the Semantic Conventions for RPC/gRPC when the `OTEL_SEMCONV_STABILITY_OPT_IN`
+  environment variable is set to `rpc` or `rpc/dup`.
+  ([#4370](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4370))
+
 ## 1.15.2
 
 Released 2026-Apr-21