It should be possible for users to explicitly define the ingressClassName when creating an Ingress in order to avoid a IngressWithoutClassname warning.

The Operator defaults to creating an Openshift Route instead of an Ingress when the former is available, so this is only applicable to a niche set of deployments.

https://access.redhat.com/solutions/7017955

https://github.com/openshift/enhancements/blob/master/enhancements/ingress/transition-ingress-from-beta-to-stable.md#risks-and-mitigations

https://github.com/keycloak/keycloak/pull/20796