The webhook notification has no imageUrl param

The webhook notification has no imageUrl param but the grafana doc has.If I want to this param what should I do.
http://docs.grafana.org/alerting/notifications/

I checked the include image option, After I click send test button,I received imageUrl param,but in the real scene has no this param.

Have you configured an image store for Grafana?

http://docs.grafana.org/alerting/notifications/#external-image-store

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