collect_sensors.py

#!/usr/bin/env python

from __future__ import print_function

import sys
import datetime
import sensors
import time

config = {}
with open("/etc/default/collect_sensors.conf") as config_file:
    exec config_file in config

if "interval" not in config:
    sys.exit("Error, need to specify period interval=<value>")
interval = int(config["interval"])
del config["interval"]

if not config:
    sys.exit("Error, no sensors specified.")

sensors.init()

def main():
    with open("sensors.prom", "w") as output_file:
        while 1:
            data = {}

            for chip in sensors.iter_detected_chips():
                for feature in chip:
                    data[ "%s/%s" % ( chip, feature.label ) ] = feature.get_value()

            when = int(time.time())

            output_file.seek(0)
            output_file.truncate()

            for name, sensor_name in config.items():
                if type(sensor_name) is not str:
                    continue

                metric_name = "sensors_" + name.lower()

                output_file.write(
                    "# TYPE %(metric_name)s gauge\n%(metric_name)s %(measured)s\n" % {
                        "metric_name" : metric_name,
                        "measured"    : data[sensor_name],
                        # "timestamp"   : when
                    }
                )

            output_file.flush()

            time.sleep(interval)

if __name__ == "__main__":
   main()

etc_collect_sensors.conf.j2

interval = 30

{% if ansible_fqdn == "juschinka.home" %}
fan2 = "dell_smm-virtual-0/Processor Fan"
cpu = "dell_smm-virtual-0/CPU"
ambient = "dell_smm-virtual-0/Ambient"
{% endif %}

{% if ansible_fqdn == "anna.home" %}
fan1 = "nct6776-isa-0290/fan1"
fan2 = "nct6776-isa-0290/fan2"
gpu = "radeon-pci-0100/temp1"
cpu = "nct6776-isa-0290/CPUTIN"
{% endif %}

sensors-collect.service

[Unit]
Description=Sensors collector service, input for prometheus node exporter
Conflicts=shutdown.target

[Service]
WorkingDirectory=/var/spool/prometheus
ExecStart=/usr/local/bin/collect_sensors.py
Restart=always
User=prometheus

[Install]
WantedBy=multi-user.target