This read-only Gauge32 field is the 'memCachedAvg' property of the 'FexSystemStatsHist' managed object in Cisco UCS Manager's equipment-inventory schema recording the averaged cache-memory figure for the interval this archived sample covers. This preserves the FEX's typical historical caching behavior for a past interval, which is context an admin checks before concluding a historical dip in available memory reflected an actual problem. Archived MemCachedAvg holding steady near 20MB while MemAvailableAvg fell in the same stored samples would point to something other than caching as the cause.