This read-write value sets a delay before a tracked object is considered to have transitioned from down to up state. Admins use this to avoid premature failback actions from momentarily recovering, but still unstable, links, requiring the up condition to persist before acting on it. For example, setting this delay to 30 seconds would prevent a track-based failover from switching traffic back to a primary link the instant it flickers back up, waiting instead to confirm it's stably reachable.