/usr/lib/python3/dist-packages/fail2ban/tests/files/logs
Edit: /usr/lib/python3/dist-packages/fail2ban/tests/files/logs/nagios (226B)
# Access of unauthorized host in /var/log/messages
# failJSON: { "time": "2005-02-03T11:22:44", "match": true , "host": "50.97.225.132" }
Feb 3 11:22:44 valhalla nrpe[63284]: Host 50.97.225.132 is not allowed to talk to us!