This is the intervals property, a Gauge32 recording how many collection intervals have been rolled into the running min/max/average figures for this specific NiErrStats instance. It matters because a low count means those derived statistics are still 'warming up' after a recent reset (such as a port flap or a fabric interconnect reboot) and shouldn't yet be treated as representative of this interface's normal behavior. For example, seeing intervals=2 right after a port reset is a signal to hold off drawing conclusions from that interface's current DeltaMax reading.