code: public function getTotalLineCount()
      {
          if ($this->logLineCount === null) {
              $this->logLineCount = 0;
              foreach ($this->getFiles() as $log) {
                  $this->logLineCount += $this->getLineCount($log);
              }
          }
  
          return $this->logLineCount;
      }
docs: Returns number of log lines added in all of registered logs
  
  @return int