This holds the lowest per-interval delta observed for frames received across the retained sampling window, i.e. the quietest single sampling period recorded. For one specific FC port's current error-statistics object, a deltaMin of 0 alongside a non-zero deltaMax confirms the errors are intermittent bursts rather than continuous, which changes how urgently it needs chasing. For example, deltaMin staying at 0 across the whole window while deltaMax occasionally ticks up is typical of an SFP that only misbehaves under thermal load.