Twelve Factor

• https://12factor.net/
• itil for influencers

III

• environment variables are too crude for typical config workloads

V

• to avoid unpleasant surprises, a deployment should only be able to access config specific to that environment (along with config common to all envs)

X

• differences between envs must be inspectable, so that the confidence you gain in one env actually means something in the next

XI

• logging goes to stderr not stdout