journalctl -r

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

journalctl -r | grep "No space left on device"

journalctl -r | grep CRON

journalctl -r grep oom

journalctl -r | grep -v audit | grep -v sshd | grep -v CRON

nagios3[1076]: Warning: The check of service 'HTTP' on host 'localhost' could not be performed due to a fork() error: 'Cannot allocate memory'.  The check will be rescheduled.

Related

• critical
• Logs
• systemctl enable
• journalctl --disk-usage
• oom-killer
• apt.systemd.daily

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