For a long time and probably still today, Google AppEngine kinda encouraged storing secrets in the YAML, which is easy to accidentally git-commit. There's no easy way to pass secrets to your services otherwise, unlike Heroku etc where it's always been a single command to put them into envvars on the jobs.
Last time I tried, the default suggestion was Cloud KMS (yeah), now there's some new secret manager that also looks annoying: https://stackoverflow.com/questions/58371905/how-to-handle-s...
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