esaProbeHistoryMinOnewayR2PDelay is an unsigned 32-bit value that reports the lowest recorded one-way delay, in microseconds, from the reflector back to the probe, for a completed interval that has already closed and been archived into the rolling history log. Because this figure isolates delay from the reflector back to the probe only, it lets a technician tell whether a latency problem is one-sided rather than assuming the whole round trip is equally at fault. For example, pulling this minimum one-way delay from the reflector back to the probe out of an archived bin from the night of a customer complaint lets the technician confirm the best case never crossed a danger threshold, steering the after-the-fact investigation toward an intermittent cause.