[9.3] [Security Solution] Unlock prebuilt rules upgrade due to deprecated lastRun.outcomeMsg (#251164)#251394
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kibanamachine merged 1 commit intoelastic:9.3from Feb 3, 2026
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…astRun.outcomeMsg (elastic#251164) **Addresses:** elastic#177852 ## Summary This PR introduces `lastRun.outcomeMsg` from `string` to `string[]` migration on rule update in Alerting Framework. It unlocking prebuilt rule upgrade workflow for customers migrated from 7.x stack version. ## Details Some time ago Alerting Framework migrated `lastRun.outcomeMsg` from `string` to `string[]`. At that moment usual migrations were deprecated due to Serverless and model version migration wasn't ready yet. This migration went smoothly thanks to the according changes to the codebase. However, the changes didn't cover customers upgrading from `7.x` stack version and having something written to `lastRun.outcomeMsg`. This PR makes change only to `rulesClient.update()` method to migrate `lastRun.outcomeMsg` before it gets written to the new saved object. Looking through the code it seems another methods aren't impacted. For example, rule duplication doesn't copy over `lastRun` field. (cherry picked from commit 3a2f3fd)
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