When setting up an alert, the email sent, in my opinion, would be better if it sent the vicinity of the row in which the goal has been achieved. Check this out:
This question generates about 250 rows, exposed in a column chart, for all time data. My goal was reached recently, but that what I’ve got in my email: I had to run the question again, so I could actually see when the goal was reached. My suggestion: show closer rows, or, at least, the last rows, rather than the first ones - the likelihood of the goal being reached in the last rows seems, to me, far greater than in the first ones.