Can the Twitch Devs add this back into the new API please?

Out of curiosity; What use case do you have for this?

Which end point is this?

Instead of appending that to every single result of a paged query, I’d personally rather see something like https://api.twitch.tv/kraken/streams/summary

Get Live Streams End point on Twitch v5 API

It conveniently counts the number of streamers streaming, even over a hundred. You don’t have to go through each pagination query to find the total number of streamers.