in my case i have 1 k8s cluster with 2 Node Pools one for testing and one for production and also i have 2 Load Balancers that should one of them serve the testing node pool and the other serve production Node Pool... but for now Load balancers Serving all nodes that you have in your cluster .. but still you can manage your ingress controllers that connected to you one of this loadbalancer avoid any traffic came to your testing ip .. but by making the load balancers able to target some nodes or node pools is great