It be great to have a new row action in tables to create a custom alert. Eg when hovering in Device Types
Mobile then you could directly create an alert for this when traffic drops by 50%. It would automatically select the correct report and the correct value and the user would only configure the
Alert me when... section. This way could get more awareness for the alerts feature which is quite useful. For evolution graphs could maybe also add an action in the bottom or so (next to period selector etc) but not sure. And of course it would only be shown for reports supported by custom alerts.