DynamoVisualProgramming.DynamoServices by Autodesk

<PackageReference Include="DynamoVisualProgramming.DynamoServices" Version="2.4.0.6186" />

 IsObsoleteAttribute

This attribute indicates the node is obsolete
using System; namespace Autodesk.DesignScript.Runtime { [AttributeUsage(AttributeTargets.Method)] public class IsObsoleteAttribute : Attribute { public string Message { get; set; } public IsObsoleteAttribute() { Message = string.Empty; } public IsObsoleteAttribute(string message) { Message = message; } } }