Add NGINX exporter for Kubernetes deployments
We currently do not have any metrics for NGINX which is something we have currently on VMs.
It does look like this is supported in the Chart https://docs.gitlab.com/ee/user/project/integrations/prometheus_library/nginx_ingress.html#about-managed-nginx-ingress-deployments so maybe it's just a matter of enabling it.
- Confirm nginx exporter is enabled
- Enable scraping of the nginx exporter