This read-only CucsEquipmentFexSystemStatsHistThresholded field is the 'thresholded' property of the 'FexSystemStatsHist' managed object in Cisco UCS Manager's equipment-inventory schema recording which of this row's system properties had crossed a configured alarm threshold at the time this sample was archived. This preserves exactly which figure, memory or CPU load, triggered the alarm at that past moment, which is what an admin needs when reconstructing the sequence of events during a post-incident review of a FEX health issue. A stored row with only the kernelMemFree bit set in Thresholded documents that a memory shortage, not a CPU-load issue, was what tripped the alarm during that incident.