syslog: log levels








Code Severity Description General Description
0 Emergency System is unusable. A "panic" condition usually affecting multiple apps/servers/sites. At this level it would usually notify all tech staff on call.
1 Alert Action must be taken immediately. Should be corrected immediately, therefore notify staff who can fix the problem. An example would be the loss of a backup ISP connection.
2 Critical Critical conditions. Should be corrected immediately, but indicates failure in a primary system, an example is a loss of primary ISP connection.
3 Error Error conditions. Non-urgent failures, these should be relayed to developers or admins; each item must be resolved within a given time.
4 Warning Warning conditions. Warning messages, not an error, but indication that an error will occur if action is not taken, e.g. file system 85% full - each item must be resolved within a given time.
5 Notice Normal but significant condition. Events that are unusual but not error conditions - might be summarized in an email to developers or admins to spot potential problems - no immediate action required.
6 Informational Informational messages. Normal operational messages - may be harvested for reporting, measuring throughput, etc. - no action required.
7 Debug Debug-level messages. Info useful to developers for debugging the application, not useful during operations.

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