Documentation for JIRA 5.2. Documentation for other versions of JIRA is available too. 
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The logging and profiling administration console lets you manage how JIRA's built-in URL logging mechanism is configured.
Choose Administration at the top right of your screen. Then choose System > Troubleshooting and Support > Logging & Profiling to open the 'Logging' page, which lists all defined log4j categories (as package names) and their current logging levels.