Priorities

Again, you can get this list from “man 3 syslog”. This is listed from top (highest) priority to bottom (lowest).

emerg: emergency, the system is not longer usable. This is analogous to “panic”.
alert: operator intervention is needed immediately.
crit: critical conditions.
err: error conditions. This includes both configuration errors and also errors that are encountered during the operation of a subsystem.
warning: warnings.
notice: nothing is wrong, but information that may prove to be useful later on.
info: informational messages, useful for profiling or other non-critical purposes.
debug: messages useful for debugging a subsystem or a daemon.