This read-only TruthValue indicates whether the associated bertConfigStream row has been changed since the test was created or started, per its description. An administrator checks this to know whether the currently running test's live results still reflect the configuration that was originally applied, or whether someone has since edited the config stream underneath it. For example, if bertTestStreamConfigChangedFlag reads true mid-test, an operator would treat the ongoing results with caution since the configuration in effect may no longer match what's shown in bertConfigStream.