For CI in mkosi, I want to configure systemd to log at debug level to the journal, but not to the console. While we already have max level settings for journald's forwarding settings, not every log line goes to the journal, specifically during early boot and when units are connected directly to the console (think systemd-firstboot), so let's extend the log level options we already have to allow specifying a comma separated list of values and lets allow prefixing values with the log target they apply to to make this possible.
System and Service Manager
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