This Gauge32 reports the number of bytes dropped for packets matching this WAN rule, measured over the past active minute. It gives an admin a data-volume view of loss for a specific WAN rule, letting them judge whether the dropped traffic represents a trivial trickle or a large chunk of a business application. For example, 2 MB dropped in a single minute for a rule tied to a backup application suggests the backup job is being throttled by the WAN link.