This is a clone of issue RHEL-95846 to use for version rhel-9.7
–
Original description:
Enhancement:
This change adds support for the SystemKeepFree option.

Reason:
It's a configurable option in `journald.conf` that isn't currently available, but is useful to be able to set.

Result:
Set the `SystemKeepFree=` option as per:
https://www.freedesktop.org/software/systemd/man/latest/journald.conf.html

Issue Tracker Tickets (Jira or BZ if any):
nil

1. 1. Summary by Sourcery

Add support for the SystemKeepFree setting in journald.conf via a new `journald_system_keep_free` variable.

New Features:

• Introduce `journald_system_keep_free` to configure the SystemKeepFree option in journald.conf.

Enhancements:

• Update the configuration template to include SystemKeepFree when the variable is set.
• Provide a default 10GB value for `journald_system_keep_free` in defaults.

Documentation:

• Document the new `journald_system_keep_free` option in the README with an example.