I believe the OPs point is that using HAProxy with a floating IP is a bit of anti-pattern in Kubernetes. The idiomatic Kubernetes way would be to use an ingress object. Both HAProxy and Nginx have ingress controllers for Kubernetes which use a load balancer in front of them. The article then goes on to talk using corosync and pacemaker which are cluster technologies in their own right. This is really bizarre. Running a cluster on a cluster would not be many people's idea of "optimizing for quick recovery."