Fix SignalR server activity name (#57118)

src/SignalR/server/Core/src/Internal/DefaultHubDispatcher.cs

@@ -808,12 +808,12 @@ internal sealed partial class DefaultHubDispatcher<[DynamicallyAccessedMembers(H
     // Make sure to call Activity.Stop() once the Hub method completes, and consider calling SetActivityError on exception.
     private static Activity? StartActivity(HubConnectionContext connectionContext, IServiceProvider serviceProvider, string methodName)
     {
-        if (serviceProvider.GetService<SignalRActivitySource>() is SignalRActivitySource signalRActivitySource
+        if (serviceProvider.GetService<SignalRServerActivitySource>() is SignalRServerActivitySource signalRActivitySource
             && signalRActivitySource.ActivitySource.HasListeners())
         {
             var requestContext = connectionContext.OriginalActivity?.Context;
 
-            return signalRActivitySource.ActivitySource.StartActivity($"{_fullHubName}/{methodName}", ActivityKind.Server, parentId: null,
+            var activity = signalRActivitySource.ActivitySource.CreateActivity(SignalRServerActivitySource.InvocationIn, ActivityKind.Server, parentId: null,
                 // https://github.com/open-telemetry/semantic-conventions/blob/main/docs/rpc/rpc-spans.md#server-attributes
                 tags: [
                     new("rpc.method", methodName),
@@ -824,6 +824,13 @@ internal sealed partial class DefaultHubDispatcher<[DynamicallyAccessedMembers(H
                     //new("server.address", ...),
                     ],
                 links: requestContext.HasValue ? [new ActivityLink(requestContext.Value)] : null);
+            if (activity != null)
+            {
+                activity.DisplayName = $"{_fullHubName}/{methodName}";
+                activity.Start();
+            }
+
+            return activity;
         }
 
         return null;

src/SignalR/server/Core/src/Internal/SignalRActivitySource.cs → src/SignalR/server/Core/src/Internal/SignalRServerActivitySource.cs

@@ -8,7 +8,10 @@ namespace Microsoft.AspNetCore.SignalR.Internal;
 // Internal for now so we don't need API review.
 // Just a wrapper for the ActivitySource
 // don't want to put ActivitySource directly in DI as hosting already does that and it could get overwritten.
-internal sealed class SignalRActivitySource
+internal sealed class SignalRServerActivitySource
 {
-    public ActivitySource ActivitySource { get; } = new ActivitySource("Microsoft.AspNetCore.SignalR.Server");
+    internal const string Name = "Microsoft.AspNetCore.SignalR.Server";
+    internal const string InvocationIn = $"{Name}.InvocationIn";
+
+    public ActivitySource ActivitySource { get; } = new ActivitySource(Name);
 }

src/SignalR/server/Core/src/SignalRDependencyInjectionExtensions.cs

@@ -32,7 +32,7 @@ public static class SignalRDependencyInjectionExtensions
         services.TryAddScoped(typeof(IHubActivator<>), typeof(DefaultHubActivator<>));
         services.AddAuthorization();
 
-        services.TryAddSingleton(new SignalRActivitySource());
+        services.TryAddSingleton(new SignalRServerActivitySource());
 
         var builder = new SignalRServerBuilder(services);
         builder.AddJsonProtocol();

src/SignalR/server/SignalR/test/Microsoft.AspNetCore.SignalR.Tests/HubConnectionHandlerTests.Activity.cs

@@ -29,7 +29,7 @@ public partial class HubConnectionHandlerTests
                 // Provided by hosting layer normally
                 builder.AddSingleton(testSource);
             }, LoggerFactory);
-            var signalrSource = serviceProvider.GetRequiredService<SignalRActivitySource>().ActivitySource;
+            var signalrSource = serviceProvider.GetRequiredService<SignalRServerActivitySource>().ActivitySource;
 
             using var listener = new ActivityListener
             {
@@ -100,7 +100,7 @@ public partial class HubConnectionHandlerTests
                 // Provided by hosting layer normally
                 builder.AddSingleton(testSource);
             }, LoggerFactory);
-            var signalrSource = serviceProvider.GetRequiredService<SignalRActivitySource>().ActivitySource;
+            var signalrSource = serviceProvider.GetRequiredService<SignalRServerActivitySource>().ActivitySource;
 
             using var listener = new ActivityListener
             {
@@ -165,7 +165,7 @@ public partial class HubConnectionHandlerTests
                 // Provided by hosting layer normally
                 builder.AddSingleton(testSource);
             }, LoggerFactory);
-            var signalrSource = serviceProvider.GetRequiredService<SignalRActivitySource>().ActivitySource;
+            var signalrSource = serviceProvider.GetRequiredService<SignalRServerActivitySource>().ActivitySource;
 
             using var listener = new ActivityListener
             {
@@ -212,7 +212,7 @@ public partial class HubConnectionHandlerTests
                 // Provided by hosting layer normally
                 builder.AddSingleton(testSource);
             }, LoggerFactory);
-            var signalrSource = serviceProvider.GetRequiredService<SignalRActivitySource>().ActivitySource;
+            var signalrSource = serviceProvider.GetRequiredService<SignalRServerActivitySource>().ActivitySource;
 
             using var listener = new ActivityListener
             {
@@ -263,7 +263,7 @@ public partial class HubConnectionHandlerTests
                 // Provided by hosting layer normally
                 builder.AddSingleton(testSource);
             }, LoggerFactory);
-            var signalrSource = serviceProvider.GetRequiredService<SignalRActivitySource>().ActivitySource;
+            var signalrSource = serviceProvider.GetRequiredService<SignalRServerActivitySource>().ActivitySource;
 
             using var listener = new ActivityListener
             {
@@ -313,7 +313,7 @@ public partial class HubConnectionHandlerTests
                 // Provided by hosting layer normally
                 builder.AddSingleton(testSource);
             }, LoggerFactory);
-            var signalrSource = serviceProvider.GetRequiredService<SignalRActivitySource>().ActivitySource;
+            var signalrSource = serviceProvider.GetRequiredService<SignalRServerActivitySource>().ActivitySource;
 
             using var listener = new ActivityListener
             {
@@ -348,7 +348,9 @@ public partial class HubConnectionHandlerTests
     {
         Assert.Null(activity.Parent);
         Assert.True(activity.IsStopped);
-        Assert.Equal($"{typeof(THub).FullName}/{methodName}", activity.OperationName);
+        Assert.Equal(SignalRServerActivitySource.Name, activity.Source.Name);
+        Assert.Equal(SignalRServerActivitySource.InvocationIn, activity.OperationName);
+        Assert.Equal($"{typeof(THub).FullName}/{methodName}", activity.DisplayName);
 
         var tags = activity.Tags.ToArray();
         if (exceptionType is not null)