Note deprecation of the node performance dashboard

Author: ehashman

content/en/blog/_posts/2016-11-00-Visualize-Kubelet-Performance-With-Node-Dashboard.md

@@ -5,6 +5,11 @@ slug: visualize-kubelet-performance-with-node-dashboard
 url: /blog/2016/11/Visualize-Kubelet-Performance-With-Node-Dashboard
 ---
 
+_Since this article was published, the Node Performance Dashboard was retired and is no longer available._
+
+_This retirement happened in early 2019, as part of the_ `kubernetes/contrib`
+_[repository deprecation](https://github.com/kubernetes-retired/contrib/issues/3007)_.
+
 In Kubernetes 1.4, we introduced a new node performance analysis tool, called the _node performance dashboard_, to visualize and explore the behavior of the Kubelet in much richer details. This new feature will make it easy to understand and improve code performance for Kubelet developers, and lets cluster maintainer set configuration according to provided Service Level Objectives (SLOs).  
 
 **Background**