Define error alerts based on both event count AND percentage change

### Problem Statement

We have an app that has varying traffic patterns. In some hours of the day there's a lot of traffic and some hours of the day there's low traffic. I want to create an alert that will trigger when there's a significant spike in errors in this app.
I thought of creating a Percentage Change alert, but I'm concerned it will generate too many false positives when the traffic is low since a small number of requests have a large impact on the percentage of change. On the other hand, an alert based on event count will need constant maintenance to ensure it's adjusted to the current baseline of errors.
I would like to be able to create an alert for this scenario.

### Solution Brainstorm

_No response_

### Product Area

Alerts