# System.Diagnostics

``` diff
 namespace System.Diagnostics {
     public class Activity : IDisposable {
+        public Activity SetBaggage(string key, string value);
     }
     public sealed class ActivitySource : IDisposable {
+        public Activity StartActivity(ActivityKind kind, ActivityContext parentContext = default(ActivityContext), IEnumerable<KeyValuePair<string, object>> tags = null, IEnumerable<ActivityLink> links = null, DateTimeOffset startTime = default(DateTimeOffset), string name = "");
-        public Activity StartActivity(string name, ActivityKind kind = ActivityKind.Internal);
+        public Activity StartActivity(string name = "", ActivityKind kind = ActivityKind.Internal);
     }
+    public sealed class StackTraceHiddenAttribute : Attribute {
+        public StackTraceHiddenAttribute();
+    }
 }
```

