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Logging Levels

DEBUG - designates fine-grained informational events that are most useful to debug an application (what is going on)

INFO - announcements about the normal operation of the system - scheduled jobs running, services starting and stopping, user-triggered processes and actions

WARN - any condition that, while not an error in itself, may indicate that the system is running sub-optimally

ERROR - a condition that indicates something has gone wrong with the system

FATAL - a condition that indicates something has gone wrong so badly that the system can not recover

TRACE - n/a within confluence

The logging levels can be manually configured by modifying the <Confluence-Install>\confluence\WEB-INF\classes\log4j.properties file.

Default Log Level

The standard Confluence log level WARN is a way for Confluence to communicate with the server administrator. Logging at WARN level and higher should be reserved for situations that require some kind of attention from the server administrator, and for which corrective action is possible.

Reference : log4j manual