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I really like this concept but there are some controversies related to twelve-factor apps. For example, storing secrets in environment variables is sometimes considered not the most secure (but I still do it).

Thanks for sharing, amazing resource!

There was an updated form of the concept, that I remember from the pivotal labs times. It's fifteen factors and you can find it here: https://tanzu.vmware.com/content/blog/beyond-the-twelve-factor-app