{datetime} UTC [34m[ notice][0m 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.
{datetime} UTC [33m[ warning][0m 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. This is a debug message
{datetime} UTC [1;31m[ critical][0m Should be corrected immediately, but indicates failure in a primary system, an example is a loss of a backup ISP connection.
{datetime} UTC [1;33;41m[ alert][0m Should be corrected immediately, therefore notify staff who can fix the problem. An example would be the loss of a primary ISP connection.
{datetime} UTC [1;4;5;33;41m[emergency][0m A "panic" condition usually affecting multiple apps/servers/sites. At this level it would usually notify all tech staff on call.