service.spec.loadBalancerIP deprecation
service.spec.loadBalancerIP was deprecated: https://github.com/kubernetes/kubernetes/pull/107235 However it has not been removed in any k8s release yet, and might not be for some time (if ever). There is no alternative yet, except for implementation-specific annotations, but this might come in a future rework of service/ingress/gateway API.
Currently loadBalancerIP is used in the externalservice.yaml for FST and MGM. Annotations can be set, but they are the same for all the services, not iterated over in the way that loadBalancerIP is in the current implementation. Probably best to wait and see for awhile, keep an eye on it until there is a good standardized alternative to using loadBalancerIP.