Kubernetes DNS Required as a dependency

[scruplelesswizard]

The controller has a hard dependency on DNS being present in the cluster instead of using the API to discover upstreams.

[pleshakov]

Yep, NGINX Plus controller uses DNS to get endpoints of a service. This works great and significantly simplifies the implementation. What could be the reasons to disable DNS add-on? What are the possible problems?

The NGINX controller uses API to discover endpoints on the other hand.