In the context of Kubernetes and Nginx ingress-controller, I can't grasp the difference between an external ingress and an internal ingress.
what an external ingress and an internal ingress differ in?
when should they be used and what use cases do they serve?
when should one use
metadata.annotations: [ kubernetes.io/ingress.class: nginx-external ] aut similis?
I can't find much on the net, that discusses such difference or exemplifies how to use them. There's always some implicit knowledge assumed.