missing battery metrics on debian - power_supply class charge_control_end_threshold ": no such device"

[marvin-sinister]

Host operating system: output of uname -a

Linux node1 6.1.0-21-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.90-1 (2024-05-03) x86_64 GNU/Linux

node_exporter version: output of node_exporter --version

node_exporter, version 1.8.0 (branch: debian/sid, revision: 1.8.0-1) build user: [email protected] build date: 20240424-20:05:35 go version: go1.22.2 platform: linux/amd64 tags: unknown

node_exporter command line flags

It's started with systemd using:

EnvironmentFile=/etc/default/prometheus-node-exporter
ExecStart=/usr/bin/prometheus-node-exporter $ARGS

and $ARGS is empty:

# cat /etc/default/prometheus-node-exporter 
# Set the command-line arguments to pass to the server.
# Due to shell escaping, to pass backslashes for regexes, you need to double
# them (\\d for \d). If running under systemd, you need to double them again
# (\\\\d to mean \d), and escape newlines too.
ARGS=""

node_exporter log output

This line repeats:

May 16 10:19:56 node1 prometheus-node-exporter[1064]: ts=2024-05-16T08:19:56.181Z caller=collector.go:169 level=error msg="collector failed" name=powersupplyclass duration_seconds=0.006216025 err="could not get power_supply class info: error obtaining power_supply class info: failed to read file \"/sys/class/power_supply/BAT0/charge_control_end_threshold\": no such device"

Are you running node_exporter in Docker?

no

What did you do that produced an error?

started node exporter

What did you expect to see?

no error and battery stats in metrics

What did you see instead?

error and no battery stats in metrics

Some potentially useful info:

# ls -l /sys/class/power_supply/BAT0/
total 0
-rw-r--r-- 1 root root 4096 May 16 10:18 alarm
-r--r--r-- 1 root root 4096 May 16 10:18 capacity
-r--r--r-- 1 root root 4096 May 16 10:18 capacity_level
-rw-r--r-- 1 root root 4096 May 16 10:18 charge_behaviour
-rw-r--r-- 1 root root 4096 May 16 10:18 charge_control_end_threshold
-rw-r--r-- 1 root root 4096 May 16 10:18 charge_control_start_threshold
-rw-r--r-- 1 root root 4096 May 16 10:35 charge_start_threshold
-rw-r--r-- 1 root root 4096 May 16 10:35 charge_stop_threshold
-r--r--r-- 1 root root 4096 May 16 10:35 cycle_count
lrwxrwxrwx 1 root root    0 May 16 10:17 device -> ../../../PNP0C0A:00
-r--r--r-- 1 root root 4096 May 16 10:35 energy_full
-r--r--r-- 1 root root 4096 May 16 10:35 energy_full_design
-r--r--r-- 1 root root 4096 May 16 10:35 energy_now
drwxr-xr-x 3 root root    0 May 16 10:17 hwmon1
-r--r--r-- 1 root root 4096 May 16 10:35 manufacturer
-r--r--r-- 1 root root 4096 May 16 10:35 model_name
drwxr-xr-x 2 root root    0 May 16 10:18 power
-r--r--r-- 1 root root 4096 May 16 10:35 power_now
-r--r--r-- 1 root root 4096 May 16 10:17 present
-r--r--r-- 1 root root 4096 May 16 10:35 serial_number
-r--r--r-- 1 root root 4096 May 16 10:17 status
lrwxrwxrwx 1 root root    0 May 16 10:17 subsystem -> ../../../../../../../../../class/power_supply
-r--r--r-- 1 root root 4096 May 16 10:35 technology
-r--r--r-- 1 root root 4096 May 16 10:17 type
-rw-r--r-- 1 root root 4096 May 16 10:17 uevent
-r--r--r-- 1 root root 4096 May 16 10:35 voltage_min_design
-r--r--r-- 1 root root 4096 May 16 10:35 voltage_now

# cat /sys/class/power_supply/BAT0/charge_control_end_threshold 
cat: /sys/class/power_supply/BAT0/charge_control_end_threshold: No such device

# tlp-stat -b
--- TLP 1.5.0 --------------------------------------------

+++ Battery Care
Plugin: thinkpad-legacy
Supported features: charge thresholds, recalibration
Driver usage:
* tp-smapi (tp_smapi) = active (status, charge thresholds, recalibration)
Parameter value ranges:
* START_CHARGE_THRESH_BAT0/1:  2..96(default)
* STOP_CHARGE_THRESH_BAT0/1:   6..100(default)

+++ ThinkPad Battery Status: BAT0 (Main / Internal)
/sys/devices/platform/smapi/BAT0/manufacturer               = SANYO
/sys/devices/platform/smapi/BAT0/model                      = COMPATIBLE
/sys/devices/platform/smapi/BAT0/manufacture_date           = 2021-10-07
/sys/devices/platform/smapi/BAT0/first_use_date             = 2023-07-21
/sys/devices/platform/smapi/BAT0/cycle_count                =      4
/sys/devices/platform/smapi/BAT0/temperature                =     25 [°C]
/sys/devices/platform/smapi/BAT0/design_capacity            =  47520 [mWh]
/sys/devices/platform/smapi/BAT0/last_full_capacity         =  44610 [mWh]
/sys/devices/platform/smapi/BAT0/remaining_capacity         =  44610 [mWh]
/sys/devices/platform/smapi/BAT0/remaining_percent          =    100 [%]
/sys/devices/platform/smapi/BAT0/remaining_running_time_now = not_discharging [min]
/sys/devices/platform/smapi/BAT0/remaining_charging_time    = not_charging [min]
/sys/devices/platform/smapi/BAT0/power_now                  =      0 [mW]
/sys/devices/platform/smapi/BAT0/power_avg                  =      0 [mW]
/sys/devices/platform/smapi/BAT0/state                      = idle

/sys/devices/platform/smapi/BAT0/start_charge_thresh        =     96 [%]
/sys/devices/platform/smapi/BAT0/stop_charge_thresh         =    100 [%]
/sys/devices/platform/smapi/BAT0/force_discharge            =      0

Charge                                                      =  100.0 [%]
Capacity                                                    =   93.9 [%]