This read-only Gauge32 field is the 'kernelMemFreeMin' property of the 'FexSystemStatsHist' managed object in Cisco UCS Manager's equipment-inventory schema recording the lowest free-memory figure reached during the interval this archived sample covers. This preserves the worst-case memory low point from a past interval, which is exactly the number an admin needs when reconstructing how close a FEX came to exhausting memory before a specific incident. An archived KernelMemFreeMin of 3MB from the hour before a support case was opened is strong supporting evidence for a memory-exhaustion root cause.