You could use the QueryViewData function
This will export the summary data into CSV format. From there you could complete your checking to see if a goal has been exceeded.
This function is only available from Tableau 10.5 onwards
Hope this helps
This is really a good news!
Thank you for your prompt reply.
I have the same question. The link fragment you provided no longer works. What are the parameters to get Query View Data to give me the summary data rather than the full data?
Thanks for help,