public sealed class KnowledgeGraphEndPoint : ArcGIS.Core.CoreObjectsBase, System.IDisposable  

{
  await QueuedTask.Run(() =>
  {
    //Create a connection properties
    var kg_props =
        new KnowledgeGraphConnectionProperties(new Uri(url));
    using (var kg = new KnowledgeGraph(kg_props))
    {
      //Get the KnowledgeGraph Data Model
      using (var kg_dm = kg.GetDataModel())
      {
        var dict_types = kg_dm.GetRelationshipTypes();

        foreach (var kvp in dict_types)
        {
          var rel_type = kvp.Value;
          var role = rel_type.GetRole();
          //note "name" will be the same name as the corresponding
          //feature class or table in the KG's relational gdb model
          var name = rel_type.GetName();
          //etc.
          //Get relationship end points
          var end_points = rel_type.GetEndPoints();
          foreach (var end_point in end_points)
          {
            System.Diagnostics.Debug.WriteLine(
              $"Origin: '{end_point.GetOriginEntityTypeName()}', " +
              $"Destination: '{end_point.GetDestinationEntityTypeName()}'");
          }
        }

      }
    }
  });
}