Journal should mark log records with _SYSTEMD_UNIT, if process assigned to unit or started in unit cgroup // systemd latest
Works for me: $ journalctl _TRANSPORT=stdout -o verbose|grep -E 'MESSAGE|_TRANSPORT|_UNIT' ... _TRANSPORT=stdout _SYSTEMD_UNIT=dbus.service MESSAGE=Failed to issue method call: Unit winbind.service is not loaded. _TRANSPORT=stdout _SYSTEMD_UNIT=bluetooth.service MESSAGE=bluetoothd[765]: Parsing /etc/bluetooth/serial.conf failed: No such file or directory
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