This is the smallest of the periodic multicast-packet delta samples UCS Manager collected within the current stats interval, expressed as a 64-bit unsigned count. 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 the quietest moment for multicast arrivals (IGMP/ARP-like flood traffic, HSRP hellos, etc.) during the sampling window, separate from the average or peak. A value that stays near 0 while multicastPacketsDeltaMax spikes to several thousand on the endpoint this history row belongs to points to bursty multicast traffic rather than a steady stream.