Rollback

• Fleet rollout

  Roll one version across a fleet of StageSets in ordered waves — canary a few tenants, soak, health-check, then widen, and halt the whole fleet on regression.

• Gating & rollout safety

  Control when and whether a rollout proceeds — update windows, promotion gates, error-budget freezes, versioned migrations, and rollback.

• PreviousRevisionUnavailable

  rollbackOnFailure is set but the last-good revisions could not be restored.

• Rollback

  Restore the last good artifact revision when a run fails.