gnome-shell-extension-system-monitor-applet from home:alefnode:desktop project

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For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:alefnode:desktop/openSUSE_Tumbleweed/home:alefnode:desktop.repo
zypper refresh
zypper install gnome-shell-extension-system-monitor-applet