This is the average of the sub-interval broadcast-packet delta samples that made up the interval this historical row represents. It matters on an archived historical sample row of that same receive-counter set, kept purely for trending past intervals rather than showing the current live value because it shows whether elevated broadcast traffic in that interval was sustained across the whole window or driven by one spike. A broadcastPacketsDeltaAvg of 2,000 alongside a broadcastPacketsDeltaMax of 20,000 in the same history row on the endpoint this history row belongs to points to one short burst rather than a steady broadcast load.