Use the original baseline for % based alerts

Environment SaaS ([ Steps to Reproduce Today, %-based metric alerts use the prior interval as the baseline, which means that at any moment, it'll auto-resolve even if the regression is still live, if there's no change from the prior interval. For example, if I've set up a metric alert for 15-min interval, it'll auto-resolve 15 minutes after firing if there's no change from the prior interval. The more accurate baseline is the original interval that triggered the alert. Expected Result The baseline for the metric alert is based on the original data that triggered the alert. Actual Result Recommended fix: • Use % comparison to trigger the alert • Use the % comparison to convert to a number-based threshold • For example - let's say my trigger is 20% change for same time in a week. If on Monday, 3/1 at 9am, I see that my alert triggers b/c count goes from 200 to 220 week over week, on 3/8, if the count is still at 220, I don't …