The ingress controller exposes the HAProxy Stats page and a Prometheus endpoint on port 1024. When deploying the ingress controller with a NodePort service, this port will be mapped to a random, high-numbered port, which you can see by listing the service's details.
kubectl get svc -A
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
haproxy-controller haproxy-ingress NodePort 10.96.15.205 <none> 80:30279/TCP,443:30775/TCP,1024:31912/TCP 84s
In this example, port 1024 is mapped to NodePort 31912.