dotnet-api-diff

System.Runtime.Versioning

 namespace System.Runtime.Versioning {
+    public sealed class ObsoletedOSPlatformAttribute : OSPlatformAttribute {
+        public ObsoletedOSPlatformAttribute(string platformName);
+        public ObsoletedOSPlatformAttribute(string platformName, string? message);
+        public string Message { get; }
+        public string Url { get; set; }
+    }
     public abstract class OSPlatformAttribute : Attribute {
         public string PlatformName { get; }
     }
     public sealed class UnsupportedOSPlatformAttribute : OSPlatformAttribute {
+        public UnsupportedOSPlatformAttribute(string platformName, string? message);
+        public string? Message { get; }
     }
 }