This object reports the measured round-trip time, in milliseconds, for a single ping probe defined in this ping monitoring table, where a value of zero specifically means the target has not yet responded rather than a true zero-latency result. An administrator watches this value to track reachability and latency to a monitored target in near real time. For example, pingRtt returning 0 repeatedly for a target that normally responds in single-digit milliseconds indicates that host has stopped responding to pings.