CPU temp disappeared after installing cockpit-pcp on Raspberry Pi 4 Model B Rev 1.4

[maxdelia]

Explain what happens

In a fresh install via backports the CPU temp is correctly visible inside the CPU card under metrics, but after installing cockpit-pcp for enabling metrics history the temp disappears!

In the console of my browser I can see the following error:

CPU temperature metric closed: Object {
  "command": "close",
  "channel": "2:7!262",
  "problem": "not-supported"
}

The system seems to be able to detect the CPU temp:

grep -r . /sys/class/hwmon/hwmon*/name returns

/sys/class/hwmon/hwmon0/name:cpu_thermal
/sys/class/hwmon/hwmon1/name:rpi_volt

grep -r . /sys/class/hwmon/hwmon*/temp* returns

38946

Version of Cockpit

276.1-1~bpo11+1

Where is the problem in Cockpit?

Metrics

Server operating system

Debian

Server operating system version

Debian GNU/Linux 11 (bullseye)

What browsers are you using?

Chrome

System log

Oct 09 10:56:23 pi40 cockpit-pcp[15725]: unknown internal metric cpu.temperature
Oct 09 10:59:21 pi40 cockpit-pcp[15725]: unknown internal metric cpu.temperature
Oct 09 10:59:23 pi40 cockpit-pcp[15725]: unknown internal metric cpu.temperature

[tomasmatus]

Interesting bug, I wasn't able to reproduce this on fedora. Could you please send which version of cockpit-pcp you have installed?

[maxdelia]

Interesting bug, I wasn't able to reproduce this on fedora. Could you please send which version of cockpit-pcp you have installed?

Sure, thanks for taking a look!

I ran apt-get -V -s install cockpit-pcp and this was the output:

...
cockpit-pcp is already the newest version (239-1).

[marusak]

239 is super old. How come it has shown temperature before? You need to enable backports to get a new version.

[maxdelia]

239 is super old. How come it has shown temperature before? You need to enable backports to get a new version.

It worked, thanks! I've used sudo apt -t bullseye-backports install cockpit-pcp.