I'd like to review PRs related to metallb addon as possible to make it better, and it would be easy to track related PRs if becoming the reviewer.
Deploy MetalLB into Kubespray/Kubernetes
MetalLB hooks into your Kubernetes cluster, and provides a network load-balancer implementation. In short, it allows you to create Kubernetes services of type "LoadBalancer" in clusters that don't run on a cloud provider, and thus cannot simply hook into paid products to provide load-balancers. This addon aims to automate this. It deploys MetalLB into Kubernetes and sets up a layer 2 load-balancer.
Install
In the default, MetalLB is not deployed into your Kubernetes cluster.
You can override the defaults by copying the contents of this file to somewhere in inventory/mycluster/group_vars
such as inventory/mycluster/groups_vars/k8s-cluster/addons.yml and updating metallb_enabled option to true.
In addition you need to update metallb_ip_range option on the addons.yml at least for suiting your network
environment, because MetalLB allocates external IP addresses from this metallb_ip_range option.