Werk #19065: Bulk discovery: Exit early if no hosts are selected

Component

Core & setup

Title

Bulk discovery: Exit early if no hosts are selected

Date

Feb 9, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.6.0b1 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.5.0b1 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.4.0p22 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

If a user didn't select any hosts, bulk discovery would run into an exception with the error message "Number of processes must be at least 1".

With this change, there will be no bulk discovery attempted for an empty selection. Instead, the user will get the following message: "The selected options do not match any hosts, nothing to do."

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