In the Alerts tab, there is a default "Disconnected" rule to report disconnection events.

I tried to add a "Connected" rule to get notifications when a connection goes back up.
"action | is | CONNECTED"
This never triggered.

However, I tried:
"action | is NOT | DISCONNECTED"
This one properly triggers and correctly reports that the Wan interface is now connected.

Is this as intended? When would "is | CONNECTED" trigger?

BTW, the fact that "is" and "is NOT" show up as the same "=>" symbol on the Rules page is very confusing.