Werk #17353: OTel: Fix crash with empty hostname computation fields

Component

Checks & agents

Title

OTel: Fix crash with empty hostname computation fields

Date

Jun 26, 2025

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.5.0b1 Not yet released	Checkmk Cloud (CCE), Checkmk MSP (CME)
2.4.0p8	Checkmk Cloud (CCE), Checkmk MSP (CME)

If the "Host name computation" attribute is left empty in the OTel Collector configuration, during the activation of changes, a crash occurs due to an AssertionError related to the host name. With this change, users are no longer allowed to leave the field empty.

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