Grafana Dashboard alert issue

Using sitespeed.io plugin i am getting metrics for pageLoadTime out.I have grafite as a datasource… Grafana as dashboard.
While alerting … I have 10 different urls … It is possible to set one alert for all urls?
Or I need to set up alert per page ?
I need to receive message like this
www.https://example.com has 4 sec of page load time out…