loadBalancerBackendPort - health check

[s0uky]

/kind bug

Hello, we have case where we want to use different loadBalancerBackendPort, but if I define different port, e.g.:

apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
kind: GCPCluster
metadata:
  name: capi-gcp
  namespace: capi-gcp
spec:
  loadBalancer:
    loadBalancerType: InternalExternal
  network:
    name: private-vpc-k8s-capi
    autoCreateSubnetworks: false
    loadBalancerBackendPort: 443

CAPG creates health check with default port 6443 and it's not possible to change it in cluster definition (I could change it through console).

It should be great if I define loadBalancerBackendPort it will be used for all port definitions which I need.

What steps did you take and what happened:
Try to change default API port.

What did you expect to happen:
Will be used right loadBalancerBackendPort from manifest.

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• Cluster-api version: v1.9.4
• Kubernetes version: (use kubectl version): 1.32
• OS (e.g. from /etc/os-release): Ubuntu 24.04.2 LTS