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The Enable BAM Statistics option is used to enable monitoring via the UI. For more information, see Web Application Statistics Monitoring with BAM.
Session Statistics
The The Session Statistics panel provides statistical information about the user sessions of the applications. It also provides a graphical view of the average system response time.
Statistics
The statistics panel provides access and performance statistics on the running JAX-WS/JAX-RS/WebApps. For more information, see Web Application Statistics Monitoring.