Syslog Severity Levels

From wikipedia Syslog#Severity_level

Value Severity Keyword Deprecated keywords Description Condition
0 Emergency emerg panic[7] System is unusable A panic condition.[8]
1 Alert alert Action must be taken immediately A condition that should be corrected immediately, such as a corrupted system database.[8]
2 Critical crit Critical conditions Hard device errors.[8]
3 Error err error[7] Error conditions
4 Warning warning warn[7] Warning conditions
5 Notice notice Normal but significant conditions Conditions that are not error conditions, but that may require special handling.[8]
6 Informational info Informational messages
7 Debug debug Debug-level messages Messages that contain information normally of use only when debugging a program.[8]