Implement Relative Thresholds in PowerAlerts

It would be very helpful if PowerAlerts could support relative thresholds. Specifically, it would be beneficial to receive notifications if the percentage of emails failing DMARC increases by a certain percentage compared to the previous time period, rather than just the current percentage of emails failing DMARC. Implementing this feature would allow users to detect significant changes in email authentication performance more effectively and take timely action to address potential issues.