Verify configuration with documentation.

Depending on where you want to troubleshoot (Bamboo server or a remote agent), you need to set the logging level on the following packages to DEBUG:

For Bamboo versions prior 9

log4j.logger.com.perforce=DEBUG 
log4j.logger.com.tek42=DEBUG

Bamboo Server

The changes have to be applied to <BAMBOO_INSTALL>/webapp/WEB-INF/classes/log4j.properties if you want to make the change permanent.

Alternatively, this can be configured via the UI.

Bamboo remote agent

Apply the changes to log4j.properties file on the agent as per this documentation.

For Bamboo version 9 and above

logger.bamboo-perforce.level=DEBUG
logger.bamboo-perforce.name=com.perforce

logger.bamboo-tek42.level=DEBUG
logger.bamboo-tek42.name=com.tek42

Bamboo Server

The changes have to be applied to <BAMBOO_INSTALL>/webapp/WEB-INF/classes/log4j2.properties if you want to make the change permanent.

Alternatively, this can be configured via the UI.

Bamboo remote agent

Apply the changes to log4j2.properties file on the agent as per this documentation.