Migrations: Run unattended upgrades in background, add liveness/readiness health probes (closes #21987)#22020

Merged

AndyButland merged 15 commits intomainfrom

v17/improvement/run-unattended-upgrades-in-background

Mar 10, 2026

Commits on Mar 5, 2026

Move unattended migrations to a background service, allowing liveness checks to recognise the application as healthy but not yet ready to serve requests.
AndyButland
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Add maintenance protection to surface controllers.
AndyButland
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Add protection for delivery API in upgrading state.
AndyButland
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Add protection for management API in upgrading state.
AndyButland
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Skip dynamic route transformer during Upgrading state (ensures surface controllers with attribute routing are handled in the upgrading state).
AndyButland
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Fix regression in attended upgrade state.
AndyButland
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Addressed code review feedback.
AndyButland
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Tidied up comments.
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Scope readiness health check predicate to Umbraco's own check.
AndyButland
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Fixed failing integration test.
AndyButland
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Commits on Mar 9, 2026

Removed TestCase from test with only a single case.
AndyButland
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