dude  filed a orphan request for ntopng :
It's been more than a year since the maintainer updated the package. It has been flagged out of date and multiple upstream versions have been released since then.
 https://aur.archlinux.org/account/dude/  https://aur.archlinux.org/pkgbase/ntopng/
Request #10706 has been accepted automatically by the Arch User Repository package request system:
The package base has been flagged out-of-date since 2017-06-09.