API Version weirdness...

applied yaml

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: engage-ingress
  annotations:
    kubernetes.io/ingress.class: nginx-external
spec:
  rules:
  - host: engage.staging.example.com
    http:
      paths:
      - path: /
        backend:
          serviceName: engage
          servicePort: 80
  tls:
  - hosts:
    - engage.staging.example.com

kubectl get yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"networking.k8s.io/v1beta1","kind":"Ingress","metadata":{"annotations":{"kubernetes.io/ingress.class":"nginx-external"},"name":"engage-ingress","namespace":"default"},"spec":{"rules":[{"host":"engage.playground.example.com","http":{"paths":[{"backend":{"serviceName":"engage","servicePort":80},"path":"/"}]}}],"tls":[{"hosts":["engage.playground.example.com"}]}}
    kubernetes.io/ingress.class: nginx-external
  creationTimestamp: "2020-05-06T00:56:19Z"
  generation: 1
  name: engage-ingress
  namespace: default
  resourceVersion: "145130300"
  selfLink: /apis/extensions/v1beta1/namespaces/default/ingresses/engage-ingress
  uid: 488bca0c-34cf-4122-a350-2bde500d0f3a
spec:
  rules:
  - host: engage.playground.example.com
    http:
      paths:
      - backend:
          serviceName: engage
          servicePort: 80
        path: /
  tls:
  - hosts:
    - engage.playground.example.com
status:
  loadBalancer:
    ingress:
    - hostname: a0901a268b2281examplee2ffbd16e2-7baadc2e29c1d5ab.elb.us-east-1.amazonaws.com

See also: https://github.com/FairwindsOps/pluto#purpose

• API dynamic nature explained: kubernetes/kubernetes#58131 (comment)
• k8s Deprecation policy: https://kubernetes.io/docs/reference/using-api/deprecation-policy/