This read-only Unsigned64 records the single highest per-interval delta of output discards observed across all collected sampling intervals recorded in this one archived historical sample of an interface's error-statistics -- the worst burst seen so far. This matters operationally because an average can look fine while a brief severe burst gets hidden in it, so admins check this peak value specifically to catch transient events, since a rising count here on this port almost always means its outbound queue is filling faster than the link can drain, i.e. this specific uplink or interface is oversubscribed or congested. A max value that's dramatically higher than the average -- for instance ten times higher -- points to a single sharp event, such as a brief cable disturbance, rather than steady degradation on this link.