prometheus-node-exporter-lua: add dhcp-leases exporter

[stephenfin]

Add a new collector to expose DHCP leases. It optionally depends on
ufp-neigh to expose device type.

Signed-off-by: Stephen Finucane stephen@that.guru

📦 Package Details

Maintainer: @champtar
_{(You can find this by checking the history of the package Makefile.)}

Description:
Add new collector for the DHCP leases. This is useful for a system status dashboard.

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🧪 Run Testing Details

• OpenWrt Version: 25.12.5
• OpenWrt Target/Subtarget: x86_64
• OpenWrt Device: Generic N100 mini PC/switch

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✅ 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.}

[stephenfin]

I think there's a bug in the bot: things look pretty consistent?

[openwrt-ai]

Commit checks

• prometheus-node-exporter-lua: add dhcp-leases exporter — the commit message/PR body say the collector "expose[s] device type", but the code actually emits a vendor label populated from ufp's fingerprint ubus object (with ufp-neigh providing the OUI/vendor database). Consider aligning the wording with the vendor label the collector actually produces.

The exporter itself looks correct: it degrades gracefully when ubus/ufp is unavailable (conn and get_vendor(...) or "", pcall around the ubus call), closes both the file and ubus connection, and upper-cases the MAC consistently with the existing uci_dhcp_host collector.

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Generated by Claude Code

[BKPepe]

I think there's a bug in the bot: things look pretty consistent?

Bot says:
➡️ Something broken? Consider reporting an issue.

[openwrt-ai]

Reviewed 1 new commit; no new issues found.

The dropped +libubus-lua dependency is safe: the base prometheus-node-exporter-lua package already lists it in DEPENDS, so it is still pulled in transitively (same pattern as the dawn collector). The amended commit message now correctly describes the vendor label, resolving the earlier commit-check note.

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Generated by Claude Code