Setting up a widget for a Pulse alert based on ticket sales

I think I had this set up for a different production season previously, but now I can't seem to figure it out. I'm trying to set up a widget with a Pulse alert for when we have a single person with 10 or more tickets to a single performance. I've tried setting it up as a bar chart and a line chart with constituent ID and ticket count, but when I add the alert it is specific to the constituent ID. This one seems like it should be pretty simple and I'm just missing something obvious. I just need to know when someone books more tickets than they are supposed to (without going through our Visitor Services manager for a group visit). Any help would be appreciated.

Thanks!
Anne Robichaux