Blackbox Exporter ICMP Check RTT

I’ve noticed that when using the ICMP check in blackbox exporter, if the probe fails, it still returns a value of 0 for the Round Trip Time (rtt). The round trip time for the ICMP packet really wasn’t zero. It was null because it never came back. So it would seem like that metric should report null in that case rather then 0?

I wanted to see if anyone had any thoughts before I maybe open an issue ticket since I’m new to Prometheus?

If trying to show say the minimum RTT, that value of 0 rather then NULL of course screws that up since it not really a valid value as well as skewing the output of other functions you might preform on the data.