Is 12factor.net Still Relevant?
As far as I know it was created around 10 years ago, and it hasn't been updated since 2017.
Especially the section about Configuration management (https://12factor.net/config)
https://12factor.net
In most cases, configuration via environment variables works fine. There are cases where it doesn't. E.g. 10k pods restarting because of a simple config change is not ideal. Better subscribe to an external system like "etcd" fetch and update the config without restarting the process.
yes still relevant, i evangelize 12 factor in my organization
there are a few "12 factor revisited" posts out there that make good points
it's still golden in terms of microservice architectures, though I feel that microservices were a mistake.