Logging level.
Returns
Supported Clients
Sample
application.output('my message',APP_LOG_LEVEL.DEBUG)
application.output('my message',APP_LOG_LEVEL.ERROR)
application.output('my message',APP_LOG_LEVEL.FATAL)
application.output('my message',APP_LOG_LEVEL.INFO)
application.output('my message',APP_LOG_LEVEL.WARNING)