It looks like nix has a sort of version of this, or there's the direct libc::getloadavg function which should be pretty simple to use (here's how CPython does it). I'd prefer not to add another dependency just for this, since systemstat has a lot of functionality in it and we just need one function.

@coolreader18 Yes, I should definitely used libc::getloadavg instead of adding another library.
This is now changed in 5707a96.