Also systemd documentation isn't compliance with:
* Tutorial
* Explaination
* How To
* Reference
For instance, I want to know which part of systemd uses `SYSTEMD_DEBUG`.
Hold on ... I am digging thru the Git repo.
Screw the systemd manual:
Here's my environment variable reference guide for debugging systemd (that is NOT documented by systemd)
https://egbert.net/blog/articles/debugging-a-service-in-syst...