This is the single highest CPU utilization percentage the node has recorded since its last node or statistics reset, again scoped to 6500 platforms. It gives an admin the worst-case data point that the rolling cdx6500NMNPSstatscpuUtil reading alone would miss between polls, useful for spotting a brief spike that caused a service blip. For instance, if this shows 98 while current utilization sits at 20, it tells you the node hit near-saturation at some point even though it looks idle now.