From: https://github.com/catapult-project/catapult/issues/3961

Users must be able to select hundreds of alerts for triage without killing the tab.
V2spa solves many of the performance issues around loading too much timeseries data (and introduces a couple new ones for now), but a simple cap on the number of lines would prevent that problem.
Displaying hundreds of lines would be visual noise anyway. A good maximum would probably be 20 or so.
The chart should indicate that users can deselect the alerts (or test cases in the chart-section) and select other alerts/cases in order to see them. Maybe a toast? Maybe a "!" icon by the options gear?