[systemd-devel] Spec for journalctl log entry data structure

[Tomasz Torcz]

November 29, 2017 1:27 PM, "Thomas Güttler" <guettliml at thomas-guettler.de> wrote:
> is there a spec or docs about the datastructure of a log entry in journalctl?
> 
> Which fields does a log record have?

There's a handy man page:
https://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html

If you look for low-level journal file format, go to 
https://www.freedesktop.org/wiki/Software/systemd/journal-files