different memory reports across versions 🔗 link

Ive notived that xymon servers report memory usage differently across versions

eg 
4.3.12 reports on physical, swap
4.3.17 reports on physical, actual, swap4.3.28 reports on real/physical, actual/virtual, swap/page
4.3.30 reports on physical:, virtual:, page:


Are these simple differences between versions or is there some configuration Ive not come across before that is determining these ?
didds