Journalctl -r

 journalctl -r | egrep -i "error|critical"

Related

• critical
• Logs

See also

• systemd-journald: journalctl, /etc/systemd/journald.conf, journalctl logs, journalctl --list-boots, journalctl --disk-usage, journalctl -u kubelet, journalctl -u prometheus, journalctl --help