To retrieve the required statistics in addition to the default statistics, we need to add the stat page in the step properties of the getstat command in the form side:stat.
Example: Client:http,attemptedTxns Server:http,txnsPerSec
NOTE: The full list of stats names can be found in the Presentation.xml or ClientPresentation.xml file located in the below location, C:\Program Files\Spirent Communications\Spirent TestCenter 4.24\Layer 4-7 Application\default\RunTimeStatistics