We have that filed in our bug tracker back in July 2022 and when I looked at the issue ( https://phabricator.wikimedia.org/T313114#8093706 ) almost all of the traffic came from a handful of IP addresses. Thus it is most probably some kind of probe, maybe to check whether internet is reachable.

As a result of the bug above, the entry is filtered out when post processing, but the page view dataset used for https://pagevews.wmcloud.org/ relies on the raw aggregated data.