This read-only object names which specific port-statistics counter, such as a particular error or utilization counter, triggered the last recorded event on this port. An admin needs this to know exactly which metric crossed a threshold or changed, since without a name the accompanying timestamp and value fields would be meaningless. For example, if this field returns the name of a CRC-error counter, the admin knows the last logged event was about rising CRC errors on that port rather than, say, a POE or utilization counter.