Microsoft Azure Developer Associate AZ-204 Practice Question

The metric that represents the overall success rate of an availability test is Availability Results / Availability. Because you need to be alerted when the success percentage falls below 80 percent, set the operator to "Less than" and the threshold to 80. Using the Average aggregation over a 10-minute evaluation period compares the mean success percentage from all executions in that window, which prevents single sporadic failures from triggering the alert and therefore reduces false positives. The other options either use an unrelated metric, the wrong aggregation, or evaluate a different condition (for example, failed location count) that would not accurately express "fewer than 80 percent of executions".