Werk #16912: host_labels_if: don't filter IPv4 APIPA (link-local) addresses

Component

Checks & agents

Title

host_labels_if: don't filter IPv4 APIPA (link-local) addresses

Date

Mar 19, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.6.0b1 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.5.0b2	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

APIPA addresses (169.254.0.0/16) are link-local for IPv4 and had been filtered when concidering whether a host is 'singlehomed' or 'multihomed', but represent legitimate network configurations.

This change limits fitering for link-local to IPv6.

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