Updating JBoss log4j logging thresholds while running

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Issue

I need to change logging thresholds for certain categories at runtime. What options do we have for this?
How to change logging level from JMX console without restarting the server instance?
Does turning up logging to TRACE for JBossManagedConnectionPool requires JBoss restart?
Tracing is not possible in production, since we don't know when the issue appears

Environment

JBoss Enterprise Application Platform (EAP) 5
log4j
settings defined in jboss-lg4j.xml

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