Werk #22778: OMD broker: survive HTML error pages

Component

Checks & agents

Title

OMD broker: survive HTML error pages

Date

Oct 19, 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
2.5.0p18 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p39	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

The broker agent section reports one line of data per site. If the message broker management interface of one site answered with an HTML error page (e.g. "404 Not Found") instead of data, the section could not be parsed at all and the crash report showed JSONDecodeError: Expecting value. All broker services of the host were affected, including the ones of healthy sites.

Lines that are not valid broker data are now ignored. The sites that delivered data are monitored as before. Services of the site that returned the error page report that their item was not found.

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