This read-only value reports the previous (most recently completed) minimum round-trip delay measured for this circuit, i.e., the best-case latency seen during the last measurement window. This gives an admin a baseline for the circuit's best achievable round-trip time, useful as a reference point when the current or maximum delay is being compared to see how much headroom above the floor currently exists. An engineer setting an alerting threshold for circuit latency would use cktRtAccuMinDelay as the healthy baseline against which cktRtAccuMaxDelay or cktRtLastDelay deviations are judged.