Werk #18955: Rotate Cookie signature secret on updates

Component	Setup
Title	Rotate Cookie signature secret on updates
Date	Mar 13, 2026
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.6.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.5.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.4.0p25 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.3.0p45 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

With this Werk we now rotate the secret we sign the session cookies on every update. This also means that all session cookies become invalid after an update.

This behavior is similar to Werk #16616.

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