For example, when an amount of orders declined / conversion rate dropped / abandoned cart rate increased / dramatic revenue spike happened. And did you make any attempt to fix this? There are services to be notified about such events, but is it really a problem for anyone? Disclaimer & context: I am thinking to develop an app to alert about business critical metrics changes and just curious whether there is a need in it. There is Google Analytics Custom Alerts to deal with sending notifications, but it doesn’t seem anyway close to be popular or discussed, so the problem might be not a problem at all.