Install cairo-dock-system-monitor-plug-in by entering the following commands in the terminal:
sudo apt update sudo apt install cairo-dock-system-monitor-plug-in
System Monitor plug-in for Cairo-dock
A collection of official plug-ins and applets for cairo-dock. . This plug-in shows you the CPU load, RAM usage, graphic card temperature, etc. The user can instantiate this applet several times to show different values each time.