Werk #22219: Kubernetes nodes: "Interface" services no longer become UNKNOWN

Component

Checks & agents

Title

Kubernetes nodes: "Interface" services no longer become UNKNOWN

Date

Aug 20, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

3.0.0b1 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.5.0p14 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p37 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Interface services on Kubernetes nodes could turn UNKNOWN with "Item not found in monitoring data", although the Checkmk agent on the node delivered valid data. The node collector sends an empty lnx_container_host_if section when it can not read the node's interfaces, and that empty section superseded lnx_if. It is now ignored when empty.

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