Werk #19236: Synthetic monitoring: Handle long Windows paths correctly

Component

Checks & agents

Title

Synthetic monitoring: Handle long Windows paths correctly

Date

Jan 28, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.6.0b1 Not yet released	Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.5.0b1 Not yet released	Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.4.0p21	Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

The Robotmk scheduler on Windows hosts could crash due to incorrect handling of long Windows paths. This caused errors when resetting permissions, preventing plans from being scheduled. An example error message is:

ERROR [robotmk_scheduler::setup::steps::api] src\bin\scheduler\setup\steps\api.rs:71: Plan my-test: Failed to reset permissions of C:\robotmk\rcc_home. Plan won't be scheduled.
Caused by: Resetting permissions of C:\robotmk\rcc_home failed

This crash results in tests not being scheduled, impacting monitoring reliability.

To resolve this issue and restore normal operation, users must update the agent on all affected Windows hosts.

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