prometheus-node-exporter-lua: duplicate sample with mt7996 and multiple radios

Package Name

prometheus-node-exporter-lua

Maintainer

@champtar

OpenWrt Version

SNAPSHOT

OpenWrt Target/Subtarget

mediatek/filogic

Steps to Reproduce

1. enable multiple radios
2. prometheus will report: time=2026-01-24T17:18:16.179Z level=WARN source=scrape.go:1949 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

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

Actual Behaviour

The chip name label is missing because the chips are identical. My proposed fix (PR #28092) works locally, but the CI build fails with unrelated package errors. Assistance in debugging the logs would be appreciated.

Confirmation Checklist

• The package is maintained in this repository.
• I understand that issues related to the base OpenWrt repository or LuCI repository will be closed.
• I am reporting an issue for OpenWrt, not an unsupported fork.

Start with proposed PR #28092 and its CI failure logs, then reproduce the reported metrics with multiple radios and identical mt7996 chips. Done means the exporter no longer produces duplicate samples and the package passes CI; no source file or test path is named in the issue.