Hello Matthew -
I suggest checking out VizAlerts and the great work there. You could take the email generated automatically based on the threshold defined and kick off a process. Good luck and bring your questions to the team in that group as they are very helpful.
I hope this helps.
Thanks for the shout-out, Patrick. VizAlerts doesn't perform ad-hoc actions through Dashboard or Worksheet actions at the moment, so it's a bit different than what Matthew asked for. It is based on a subscription concept. But the main goal is the same--automation based on viz data. We're not yet to the point where it can export a CSV to a file share, but we're hoping to add that feature in 2.1. Hopefully we'll be able to perform append and delete operations as well--we'll see.