grafeas reference

http://techgenix.com/grafeas-kubernetes/

https://shopifyengineering.myshopify.com/blogs/engineering/how-shopify-governs-containers-at-scale-with-grafeas-and-kritis

helm reference from medium

https://medium.com/@elijudah/configuring-minimal-rbac-permissions-for-helm-and-tiller-e7d792511d10