That is not a function of Wowza Streaming Engine. You can use our REST API to detect when a new live stream appears and then send the notification per the method of your choice.
For example, a basic digest authentication command that returns XML formatted output of all live streams on a specific application would look as follows.
$ curl --digest -u "username:password" -X GET -H 'Accept:application/xml; charset=utf-8' http://localhost:8087/v2/servers/_defaultServer_/vhosts/_defaultVHost_/applications/live/instances/_definst_
I suggest that if you are unfamiliar with Wowza Streaming Engine’s REST API that you use our Swagger documentation. More information on how to enable the REST API documentation can be found in the following article:
https://www.wowza.com/docs/how-to-access-documentation-for-wowza-streaming-engine-rest-api
The download link is buried in the article above. You can download the documentation here:
https://www.wowza.com/downloads/forums/restapidocumentation/RESTAPIDocumentationWebpage.zip