Ingress component does not work with external-dns to create DNS entries based on Ingress objects

[invidian]

Currently as Ingress Controller implementation, we use Contour, which at the moment does not set the IP value in Ingress resources, which makes it unusable with external-dns component.

Example:

$ kubectl get ingress --all-namespaces
NAMESPACE   NAME      HOSTS                                    ADDRESS   PORTS     AGE
dex         dex       dex.london.lokomotive-k8s.net                 80, 443   23h
gangway     gangway   gangway.london.lokomotive-k8s.net             80, 443   23h

This has been a long standing issue for Contour (projectcontour/contour#403) from 2018.

Workarounds

• use Envoy annotations and configure external-dns to also create entries based on Service objects annotations
• Create alternative implementation for Ingress component using e.g. nginx-ingress and recommend using that if user needs external-dns integration

Actual solution

We could join efforts in projectcontour/contour#2121 and implement this functionality in Contour.

[invidian]

We added a workaround for it in 71c19e0, but it is no longer needed, so it should be removed as stated in #589. Nothing to do here.