Clean up

Author: JamesNK

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

@@ -86,7 +86,6 @@ public override async Task OnConnectedAsync(HubConnectionContext connection)
 
         var hubActivator = scope.ServiceProvider.GetRequiredService<IHubActivator<THub>>();
         var hub = hubActivator.Create();
-
         Activity? activity = null;
         try
         {
@@ -396,6 +395,7 @@ static async Task ExecuteInvocation(DefaultHubDispatcher<THub> dispatcher,
                         var logger = dispatcher._logger;
                         var enableDetailedErrors = dispatcher._enableDetailedErrors;
 
+                        // Hub invocation gets its parent from a remote source. Clear any current activity and restore it later.
                         var previousActivity = Activity.Current;
                         if (previousActivity != null)
                         {
@@ -515,6 +515,7 @@ private async Task StreamAsync(string invocationId, HubConnectionContext connect
 
         streamCts ??= CancellationTokenSource.CreateLinkedTokenSource(connection.ConnectionAborted);
 
+        // Hub invocation gets its parent from a remote source. Clear any current activity and restore it later.
         var previousActivity = Activity.Current;
         if (previousActivity != null)
         {