dotnet-core/release-notes/3.0/preview/api-diff/preview6/3.0-preview6_System.Threading.md

System.Threading

 namespace System.Threading {
     public static class Monitor {
+        public static long LockContentionCount { get; }
     }
     public static class ThreadPool {
+        public static long CompletedWorkItemCount { get; }
+        public static long PendingWorkItemCount { get; }
+        public static int ThreadCount { get; }
     }
 }