docs: def _get_all_timers(self, dataframe):
          """Get all timers and set them in the _timers_values property
  
          :param pandas.DataFrame dataframe: the main dataframe with row results
          """
          s = dataframe['custom_timers'].apply(json.loads)
          s.index = dataframe['epoch']
          for index, value in s.iteritems():
              if not value:
                  continue
              for key, value in six.iteritems(value):
                  self._timers_values[key].append((index, value))
                  self.total_timers += 1
          del dataframe['custom_timers']
          del s