code: def discover(self, metafile):
      
      for report in self.reports:
        if report.remote_location == 'local':
          if naarad.utils.is_valid_file(os.path.join(os.path.join(report.location, self.resource_path), metafile)):
            with open(os.path.join(os.path.join(report.location, self.resource_path), metafile), 'r') as meta_file:
              if metafile == CONSTANTS.STATS_CSV_LIST_FILE:
                report.stats = meta_file.readlines()[0].split(',')
              elif metafile == CONSTANTS.PLOTS_CSV_LIST_FILE:
                report.datasource = meta_file.readlines()[0].split(',')
              elif metafile == CONSTANTS.CDF_PLOTS_CSV_LIST_FILE:
                report.cdf_datasource = meta_file.readlines()[0].split(',')
          else:
              report.status = 'NO_SUMMARY_STATS'
              self.status = 'ERROR'
              logger.error('Unable to access summary stats file for report :%s', report.label)
              return False
        else:
          stats_url = report.remote_location + '/' + self.resource_path + '/' + metafile
          meta_file_data = naarad.httpdownload.stream_url(stats_url)
  
          if meta_file_data:
            if metafile == CONSTANTS.STATS_CSV_LIST_FILE:
              report.stats = meta_file_data.split(',')
            elif metafile == CONSTANTS.PLOTS_CSV_LIST_FILE:
              report.datasource = meta_file_data.split(',')
            elif metafile == CONSTANTS.CDF_PLOTS_CSV_LIST_FILE:
              report.cdf_datasource = meta_file_data.split(',')
          else:
            report.status = 'NO_SUMMARY_STATS'
            self.status = 'ERROR'
            logger.error('No summary stats available for report :%s', report.label)
            return False
      return True
docs: Determine what summary stats, time series, and CDF csv exist for the reports that need to be diffed.
      :return: boolean: return whether the summary stats / time series / CDF csv summary was successfully located