[atlas] destination_ip_responded field in traceroute measurements

Hi, to my delight I discovered that there is now a "destination_ip_responded" field contained in traceroute measurement results. I often want to know this and had to handle it myself until now so I'm very happy that this seems to be a built-in field now. I only wonder if this is a feature to stay (since it's not in the documentation yet), and if it is server side, i.e., always available independent of the probe firmware? Best, Malte