Werk #18942: host configuration requires a datasource but none configured error

Component

Checks & agents

Title

host configuration requires a datasource but none configured error

Date

Oct 31, 2025

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.3.0p42	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

The prometheus special agent was failing during activate changes with the following error:

host configuration requires a datasource but none configured

This error would occur when a Prometheus agent rule was configured to match a host that did not have a configured IP address.

This fix ensures that the agent can successfully process the configuration and activate changes even when the target host's IP is missing.