Well thats an endpoint for game developers to get their own game analytics data that they own.
There isn’t one
They “spam” the API with requests and then collate the data into their own database and determiner their own conclusions.
There are no “historical” endpoints that API users can call (unless you are a game dev)
So they “spam” “Get Streams” periodicailly and do the math themseleves.
If you’re the games developer, use the Get Game Analytics endpoint, or if you’re not the games developer you would need to periodically poll the Get Streams endpoint to track how many streams there are for a game, and how long they’ve been streaming.