Host operating system

Linux 6.1.0-38-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.147-1 (2025-08-02) x86_64 GNU/Linux

node_exporter version

1.8.1 (quay.io/prometheus/node-exporter:v1.8.1 via kube-prometheus)

Description

Possibly related to #1703 (similar fix?)

Two new nodes in our cluster are logging following line in node-exporter (1.8.1) every few seconds:

ts=2025-09-10T13:48:42.755Z caller=collector.go:169 level=error msg="collector failed" name=thermal_zone duration_seconds=0.000542769 err="invalid argument"

Cause most probably is that one of the cooling devices in /sys/class/thermal cannot be queried correctly:

/sys/class/thermal# LC_ALL=C cat cooling_device14/cur_state
cat: cooling_device14/cur_state: Invalid argument

(other files/properties can be read)