This field is part of the PCIeFatalStats table's tally of poisoned-TLP errors on this compute node's PCIe fabric — a poisoned TLP is one the sending device deliberately marks as carrying corrupted data (the EP/poison bit) instead of silently forwarding bad data. This is the count of this specific error type accumulated during the most recently completed 1-hour collection window for this compute node, which is what lets an admin tell whether the fault is a one-off blip or actively recurring at that timescale. For example, a jump from 0 to 2 in this 1-hour window would point to something like e.g. a memory ECC error on a network adapter causing the adapter to poison the TLP carrying that corrupted payload instead of passing it through unflagged happening twice during that period specifically, rather than a single lingering old error.