I was going through a Kubernetes resource manifest file that creates a namespace –

apiVersion: v1
kind: Namespace
metadata:
  labels:
    kubernetes.io/metadata.name: argocd
    name: argocd
  name: argocd

I see a special label here kubernetes.io/metadata.name: argocd.

My questions:

1. Is this a kind of any pattern or convention?
2. Is the label’s name defined so because it can be used by some other resource? If yes, then what is the purpose?
3. Why is the label duplicating the other name label, and also the name of the namespace? Is there any convention for this?

What did I try?

There is a discussion on this page that I am not sure that I understand it correctly.