Nginx annotations is not something we want to keep though and there is rarely such a thing as a seamless drop-in replacement. Every change needs to be intensively tested and nobody in their right mind would replace an ingress controller by another one in-place on any cluster size. The correct way will be to offer a new ingress class and nudge the cluster users to migrate to that one, one app at a time, which means you could as well migrate to something completely different, depending on size and effort. Traefik tries very hard to be an option in Kubernetes space, with some promising concepts, but supporting random annotations is not it.
