MarsSeed [1] filed a request to merge plasma5-applets-network-monitor [2] into plasma5-applets-netspeed [3]:
'plasma5-applets-network-monitor' is broken. Last released in 2016, its upstream is unmaintained since 2017. Users can install 'plasma5-applets-netspeed' instead. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/plasma5-applets-network-monitor/ [3] https://aur.archlinux.org/pkgbase/plasma5-applets-netspeed/
