docs: private void pingMemberIfRequired(long now, Member member) {
          if (!icmpEnabled || icmpParallelMode) {
              return;
          }
  
          long lastHeartbeat = heartbeatFailureDetector.lastHeartbeat(member);
          if ((now - lastHeartbeat) >= legacyIcmpCheckThresholdMillis) {
              runPingTask(member);
          }
      }