Instead of a % of budget, what we really need is to be alerted anytime we are above a budgeted pace. For example, if Azure could calculate at the end of each business day what our total costs for the billing cycle are so far, and what percent of the billing cycle has elapsed, you could send us an alert if we are above the budget dollar pace we set.

Here's the business case. I get a monthly budget approved by my Finance Department. With this enhancement, I would set one budget pace alert at a dollar value a little lower than my approved number so I have some cushion. Then, if I receive a "You're over budget pace" email, this is a real alert as I have to take action. With current functionality, I now set a bunch of % limits and I am frequently getting alerted for no reason during the month as after I do the math, we are within budget pace.