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Werk #18555: Agent updater: do not require signature keys on remote sites in an UltimateMT setup

Component Setup
Title Agent updater: do not require signature keys on remote sites in an UltimateMT setup
Date May 4, 2026
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.6.0b1
Not yet released
Checkmk Ultimate MT
2.5.0p2
Not yet released
Checkmk Ultimate MT

Previously, on remote sites in an UltimateMT setup, the Agent updater (Linux, Windows, Solaris) ruleset rejected configurations that did not contain at least one entry under Signature keys the agent will accept. This blocked saving the rule on remote sites, where signature keys are managed centrally.

This restores the Checkmk 2.4 behavior: the "at least one signature key" requirement is now skipped on remote sites in an UltimateMT setup.

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