If you can see this, current branch is camp-master.
Some manifests were modified for the production environnment of wide-camp-1909. Please refer to master branch and check the details.
To use Horizontal Pod Autoscaling, you need to deploy this metrics-server in namespace kube-system first. Run the following for installation and confirmation:
% kubectl apply -f deploy/1.8+/
% kubectl describe deployment metrics-server -n kube-system
% kubectl top nodes