This Unsigned64 value is the lowest I2C bus error count recorded for this PSU during the current stats-collection interval. In practice this is most useful as confirmation that this specific PSU had at least one clean, error-free sampling window during the interval, which is reassuring context alongside a nonzero max or average for the same unit. This typically reads 0, showing the PSU's I2C bus performed cleanly for at least one collection cycle even if other figures in the interval show occasional errors.