This is currently only visible in the code of the BPA test, and not yet documented publically.  The intention is that the thresholds are fixed, so there is no option to overwrite these.  We aim to have tests that run out-of-the-box, any logic can be implemented in the test so that we can avoid tweaking and playing around with thresholds.  Clearly, if it would be required for specific cases we can allow for input parameters.

More information about the test in general can be found here: Cassandra DB Size – DataMiner Dojo