Werk #18927: Notifications: handle undefined mail variables

Component	Notifications
Title	Notifications: handle undefined mail variables
Date	Oct 21, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.4.0p15 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Mail notifications failed when the following variables were undefined:

• PREVIOUSHOSTHARDSTATE
• PREVIOUSSERVICEHARDSTATE

These variables now default to UNKNOWN when undefined.

No action is required from users to benefit from this improvement.

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