Function queue_anti_entropy 

pub fn queue_anti_entropy<D, T>(
    transport: &mut T,
    from: u64,
    to: u64,
    local: &EventLog<D>,
    remote_version: &VersionVector,
) -> Result<(), TransportError>
where
    D: Clone,
    T: TransportAdapter<D>,

Queue missing records. Admission happens at the receiver; use anti_entropy when both replicas are available to observe refusals.