[Question] Event types list

[rdcm]

Where i can find all possible event types list? In all samples, event types specified with "dot notation", like this:

workitem.created
workitem.updated
...

This endpoint not return any result like this workitem.updated https://docs.microsoft.com/en-us/rest/api/vsts/notification/event%20types/list?view=vsts-rest-5.0

Suggestion: What about do not use magic strings in client library?