Why does Istio create istio-autogenerated-k8s-ingress?

I’ve been getting external-dns up and running, and I noticed a message in the external-dns logs (Ignoring changes to ‘*’ because a suitable Azure DNS zone was not found.). I believe it’s caused by the Gateway that is created during Istio installation (pasted below). What is this Gateway configured for? I might be missing something, but I can’t see where it is used.

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: istio-autogenerated-k8s-ingress
  namespace: istio-system
  labels:
    app: gateways
    chart: gateways
    heritage: Tiller
    release: istio
spec:
  selector:
    istio: ingressgateway
  servers:
  - port:
      number: 80
      protocol: HTTP2
      name: http
    hosts:
    - "*"

  - port:
      number: 443
      protocol: HTTPS
      name: https-default
    tls:
      mode: SIMPLE
      serverCertificate: /etc/istio/ingress-certs/tls.crt
      privateKey: /etc/istio/ingress-certs/tls.key
    hosts:
    - "*"