SonarCloud instance reports a problem in JfrNetworkUtilization::send_events: "Identical sub-expressions on both sides of operator "-"." here:

  const JfrTickspan interval = last_sample_instant == 0 ? cur_time - cur_time : cur_time - last_sample_instant;

Note "cur_time - cur_time". It would seem that `interval` is effectively zero when `last_sample_instant` is not yet initialized. And I see that the subsequent code checks for `interval.value() > 0` for every interface. That can be optimized a bit: when `last_sample_instant` is not available, do not enter the loop, and don't check `interval.value()`.