Ingress resource is bassicaly "implementation specific" and isn't portable. It's not deprecated now, but there plans to retire ingress-nginx: https://kubernetes.io/blog/2025/11/11/ingress-nginx-retireme...
Anyway, Ingress resource been in "Migrate to Gateway" state for awhile.
> but there plans to retire ingress-nginx
To clarify, it’s already retired and the repo has been archived since 24th of March.