Bandwidth monitor in topbar for MacOS
Solution 1:
It looks very much like iStat Menus.
There are many view & information options, but I'm reasonably sure that's one of them.
BTW, the orange highlighted segment in your image is actually mostly disk read/write speed. Network usage is just to the right - I re-imaged, labels are to the left
Solution 2:
That looks like it iStat Menus from Bjango.
I currently am using iStat Menus and it does have a lot of functionality to choose from.