Change tags parameter in Activity.AddException to be in parameter.

src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSourceActivity.cs

@@ -50,7 +50,7 @@ public string? Id
         public string? TraceStateString { get { throw null; } set { } }
         public System.Diagnostics.Activity AddBaggage(string key, string? value) { throw null; }
         public System.Diagnostics.Activity AddEvent(System.Diagnostics.ActivityEvent e) { throw null; }
-        public System.Diagnostics.Activity AddException(System.Exception exception, System.Diagnostics.TagList tags = default, System.DateTimeOffset timestamp = default) { throw null; }
+        public System.Diagnostics.Activity AddException(System.Exception exception, in System.Diagnostics.TagList tags = default, System.DateTimeOffset timestamp = default) { throw null; }
         public System.Diagnostics.Activity AddLink(System.Diagnostics.ActivityLink link) { throw null; }
         public System.Diagnostics.Activity AddTag(string key, string? value) { throw null; }
         public System.Diagnostics.Activity AddTag(string key, object? value) { throw null; }

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Activity.cs

@@ -532,7 +532,7 @@ public Activity AddEvent(ActivityEvent e)
         /// <para>- Any registered <see cref="ActivityListener"/> with the <see cref="ActivityListener.ExceptionRecorder"/> callback that adds "exception.message", "exception.stacktrace", or "exception.type" tags
         /// will not have these tags overwritten, except by any subsequent <see cref="ActivityListener"/> that explicitly overwrites them.</para>
         /// </remarks>
-        public Activity AddException(Exception exception, TagList tags = default, DateTimeOffset timestamp = default)
+        public Activity AddException(Exception exception, in TagList tags = default, DateTimeOffset timestamp = default)
         {
             if (exception == null)
             {