prometheus-node-exporter-lua: add chip_name to temperature metric collection

[vgropp]

removes duplicate sample with mt7996 and others with multiple radios

📦 Package Details

Maintainer: @champtar

Description:
Using the hwmon collector with a Banana Pi BPI-R4 there are duplicate samples for node_hwmon_temp_celsius{sensor="temp1",chip="ieee80211_phy0"}. This results in prometheus warnings:
level=WARN source=scrape.go:1923 msg="Error on ingesting samples with different value but same timestamp" component="scrape manager" scrape_pool=node-exporter target=http://<ip>:9100/metrics num_dropped=2

Adding the chip_name to node_hwmon_temp_celsius fixes this.

Current metrics:
Banana Pi BPI-R4

node_hwmon_chip_names{chip_name="mt7996_phy0.0",chip="ieee80211_phy0"} 1
node_hwmon_temp_celsius{sensor="temp1",chip="ieee80211_phy0"} 49
node_hwmon_chip_names{chip_name="mt7996_phy0.1",chip="ieee80211_phy0"} 1
node_hwmon_temp_celsius{sensor="temp1",chip="ieee80211_phy0"} 49
node_hwmon_chip_names{chip_name="mt7996_phy0.2",chip="ieee80211_phy0"} 1
node_hwmon_temp_celsius{sensor="temp1",chip="ieee80211_phy0"} 51

GL.iNet GL-MT6000

node_hwmon_chip_names{chip_name="cpu_thermal",chip="thermal_thermal_zone0"} 1
node_hwmon_temp_celsius{sensor="temp1",chip="thermal_thermal_zone0"} 45.499
node_hwmon_chip_names{chip_name="mdio_bus:01",chip="mdio-bus_mdio-bus:01"} 1
node_hwmon_temp_celsius{sensor="temp1",chip="mdio-bus_mdio-bus:01"} 52
node_hwmon_chip_names{chip_name="mdio_bus:07",chip="mdio-bus_mdio-bus:07"} 1
node_hwmon_temp_celsius{sensor="temp1",chip="mdio-bus_mdio-bus:07"} 64
node_hwmon_chip_names{chip_name="mt7915_phy0",chip="ieee80211_phy0"} 1
node_hwmon_temp_celsius{sensor="temp1",chip="ieee80211_phy0"} 49
node_hwmon_chip_names{chip_name="mt7915_phy1",chip="ieee80211_phy1"} 1
node_hwmon_temp_celsius{sensor="temp1",chip="ieee80211_phy1"} 49

Fixed metrics:
Banana Pi BPI-R4

node_hwmon_chip_names{chip_name="mt7996_phy0.0",chip="ieee80211_phy0"} 1
node_hwmon_temp_celsius{sensor="temp1",chip_name="mt7996_phy0.0",chip="ieee80211_phy0"} 55
node_hwmon_chip_names{chip_name="mt7996_phy0.1",chip="ieee80211_phy0"} 1
node_hwmon_temp_celsius{sensor="temp1",chip_name="mt7996_phy0.1",chip="ieee80211_phy0"} 55
node_hwmon_chip_names{chip_name="mt7996_phy0.2",chip="ieee80211_phy0"} 1
node_hwmon_temp_celsius{sensor="temp1",chip_name="mt7996_phy0.2",chip="ieee80211_phy0"} 55

GL.iNet GL-MT6000

node_hwmon_chip_names{chip_name="cpu_thermal",chip="thermal_thermal_zone0"} 1
node_hwmon_temp_celsius{sensor="temp1",chip_name="cpu_thermal",chip="thermal_thermal_zone0"} 45.499
node_hwmon_chip_names{chip_name="mdio_bus:01",chip="mdio-bus_mdio-bus:01"} 1
node_hwmon_temp_celsius{sensor="temp1",chip_name="mdio_bus:01",chip="mdio-bus_mdio-bus:01"} 52
node_hwmon_chip_names{chip_name="mdio_bus:07",chip="mdio-bus_mdio-bus:07"} 1
node_hwmon_temp_celsius{sensor="temp1",chip_name="mdio_bus:07",chip="mdio-bus_mdio-bus:07"} 64
node_hwmon_chip_names{chip_name="mt7915_phy0",chip="ieee80211_phy0"} 1
node_hwmon_temp_celsius{sensor="temp1",chip_name="mt7915_phy0",chip="ieee80211_phy0"} 49
node_hwmon_chip_names{chip_name="mt7915_phy1",chip="ieee80211_phy1"} 1
node_hwmon_temp_celsius{sensor="temp1",chip_name="mt7915_phy1",chip="ieee80211_phy1"} 48

---

🧪 Run Testing Details

• OpenWrt Version: OpenWrt SNAPSHOT r32316
• OpenWrt Target/Subtarget: mediatek/filogic
• OpenWrt Device: Banana Pi BPI-R4, GL.iNet GL-MT6000

---

✅ Formalities

• I have reviewed the CONTRIBUTING.md file for detailed contributing guidelines.

If your PR contains a patch:

• It can be applied using git am
• It has been refreshed to avoid offsets, fuzzes, etc., using

  make package/<your-package>/refresh V=s

• It is structured in a way that it is potentially upstreamable
  _{(e.g., subject line, commit description, etc.)
  We must try to upstream patches to reduce maintenance burden.}

[GeorgeSapkin]

The commit message needs to be prefixed with a package name and follow the 50/75 rule as per the submissions guidelines. And the package needs a PKG_RELEASE bump.

[vgropp]

sorry for not following guidelines, i hope its fine now

[vgropp]

ok, i have no clue at all about these build failures. I can see libcurl recursive dependency and other errors but i dont understand why the build is failing by a change in the .lua script. I hope ill find more time to debug the full build process the next days

[vgropp]

as i am still not able to reproduce a full build and this keeps failing but the patched version is working on my devices i have to step back fixing this, sorry. I would love to step back in if anyone can give me a hint what to fix or at least where to find the build error.

[champtar]

@vgropp sorry for the delay, can you run the official node exporter on the BPI-R4 and see what we get ?

[vgropp]

in 1.11.1 / 2026-04-07 i get:

# HELP node_hwmon_chip_names Annotation metric for human-readable chip names
# TYPE node_hwmon_chip_names gauge
node_hwmon_chip_names{chip="ieee80211_phy0",chip_name="mt7996_phy0_0"} 1
node_hwmon_chip_names{chip="ieee80211_phy0",chip_name="mt7996_phy0_1"} 1
node_hwmon_chip_names{chip="ieee80211_phy0",chip_name="mt7996_phy0_2"} 1
node_hwmon_chip_names{chip="platform_pwm_fan",chip_name="pwmfan"} 1
node_hwmon_chip_names{chip="platform_sfp2",chip_name="sfp2"} 1
node_hwmon_chip_names{chip="thermal_thermal_zone0",chip_name="cpu_thermal"} 1

# HELP node_hwmon_temp_celsius Hardware monitor for temperature (input)
# TYPE node_hwmon_temp_celsius gauge
node_hwmon_temp_celsius{chip="ieee80211_phy0",sensor="temp1"} 55
node_hwmon_temp_celsius{chip="platform_sfp2",sensor="temp1"} 57.09
node_hwmon_temp_celsius{chip="thermal_thermal_zone0",sensor="temp0"} 60.69
node_hwmon_temp_celsius{chip="thermal_thermal_zone0",sensor="temp1"} 60.552

and in sysout:

time=2026-05-26T16:09:18.951Z level=ERROR source=http.go:175 msg="error gathering metrics: 6 error(s) occurred:
* [from Gatherer #2] collected metric \"node_hwmon_temp_crit_celsius\" { label:{name:\"chip\" value:\"ieee80211_phy0\"} label:{name:\"sensor\" value:\"temp1\"} gauge:{value:110}} was collected before with the same name and label values
* [from Gatherer #2] collected metric \"node_hwmon_temp_celsius\" { label:{name:\"chip\" value:\"ieee80211_phy0\"} label:{name:\"sensor\" value:\"temp1\"} gauge:{value:55}} was collected before with the same name and label values
* [from Gatherer #2] collected metric \"node_hwmon_temp_max_celsius\" { label:{name:\"chip\" value:\"ieee80211_phy0\"} label:{name:\"sensor\" value:\"temp1\"} gauge:{value:120}} was collected before with the same name and label values
* [from Gatherer #2] collected metric \"node_hwmon_temp_crit_celsius\" { label:{name:\"chip\" value:\"ieee80211_phy0\"} label:{name:\"sensor\" value:\"temp1\"} gauge:{value:110}} was collected before with the same name and label values
* [from Gatherer #2] collected metric \"node_hwmon_temp_celsius\" { label:{name:\"chip\" value:\"ieee80211_phy0\"} label:{name:\"sensor\" value:\"temp1\"} gauge:{value:57}} was collected before with the same name and label values
* [from Gatherer #2] collected metric \"node_hwmon_temp_max_celsius\" { label:{name:\"chip\" value:\"ieee80211_phy0\"} label:{name:\"sensor\" value:\"temp1\"} gauge:{value:120}} was collected before with the same name and label values"

so its the same bug but a bit different behavior. I would really love to see the bpi-r4 support by the lua for all three bands