Originally, it did not have voice calls but was added later. Now FB has decided to add video calling, too.
‘Webgazer’ helps you to be aware of any downtime with a swift notification through different means of communication from the email to some other integrated tools.
These metrics are rolling out to a small group of creators today, & will be available to everyone in YouTube Studio within a few weeks. A couple of weeks after that they will be available in Creator Studio Classic.