As stated, I use the System Monitor widget to display CPU temperature, GPU temperature and SSD temperature in my top panel. One oddity I’ve noticed is that when I have many windows open at once on screen, the text displayed in the center of the pie chart disappears on one of the readouts - Sometimes it’s CPU temp that drops out, sometimes it’s either GPU temp or SSD temp that drops out.
See screenshots below.
All elements present:
One element missing:
