Monitoring logs

• /var/log/nagios3/nagios.log
• /var/log/sysstat/
• /var/lib/prometheus/

du -hs /var/log/nagios3/ /var/log/sysstat/ /var/lib/prometheus/
4.0M	/var/log/nagios3/
66M	/var/log/sysstat/
545M	/var/lib/prometheus/

No space left on device