Today, I set up SSH public key authentication on my RPI5B running Armbian-unofficial 24.8.0-trunk Bookworm. During the test, I noticed that the initial SSH session message displayed the CPU temperature and other details. Unfortunately, the vcgencmd utility provided by the Raspberry Pi Foundation doesn't work on Armbian. I'm looking to understand how the temperature, CPU clock, and GPU clock are measured, and if possible, I'd like to receive some code to do so.