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Werk #20015: check_cert: Remove duplicated error details on connection failure

Component Checks & agents
Title check_cert: Remove duplicated error details on connection failure
Date Jun 26, 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
2.5.0p9
Not yet released
Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p34
Not yet released
Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Previously, when the active check Check certificates (check_cert) failed to connect to the target host (for example on a TLS handshake error), the service output was hard to read: the full multi-line error report was placed into the service summary, and the "Caused by" error chain was shown twice in the service details.

This has been fixed. The service summary now shows a single, concise reason for the failure, while the complete error chain - including the "Caused by" block - appears exactly once in the service details.

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