Under ‘Advanced Gatling Test Options’ you can modify the Gatling command line to pass in custom properties.
As defined in the Gatling documentation for passing parameters
You might want to pass parameters from the command line to the Simulation, for example the number of users, the duration of the ramp…
This can be done very easily with additional JAVA_OPTS in the launch script:
In the advanced settings we provide a way to manage the JAVA_OPTS by defining the string you want passed through.
As seen in the user interface
Which would produced in the command line
This is an advanced feature and should be used with caution.