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CancelDataplaneUpgrade

POST 
/configurator/v1/dataplane-upgrade/cancel

CancelDataplaneUpgrade emits a pending UPGRADE_CANCEL event against the workspace. The liaison worker picks it up via the normal ListPendingEvents poll, matches the in-flight TarsUpgrade CR by name (= upgrade_event_id), and patches spec.cancel so the running Job initiates helm --atomic rollback at its next 5s poll tick. Idempotent: a no-op when the CR already has spec.cancel=true or has reached a terminal phase.

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Success