Proposal: evaluate the integration with nginx plus

Here's comparison list among

https://github.com/nginxinc/kubernetes-ingress/blob/master/docs/nginx-ingress-controllers.md

here's the helm chart: https://github.com/nginxinc/helm-charts

and there's the related exporter: https://github.com/nginxinc/nginx-prometheus-exporter

we need to evaluate the possibility of integrating Nginx ingress solution and related effort.