syslog
Map Levels to syslog levels. Used by other tooling such as Graylog. The level values for syslog are:
0 = Emergency (unused)
1 = Alert (unused)
2 = Critical (mapped to from FATAL)
3 = Error (mapped to from ERROR)
4 = Warning (mapped to from WARN)
5 = Notice (unused)
6 = Informational (mapped to from INFO)
See syslog(2)