code: def __get_metrics(self):
          
          esfilters_close = None
          esfilters_submit = None
          if self.esfilters:
              esfilters_close = self.esfilters.copy()
              esfilters_submit = self.esfilters.copy()
  
          closed = ClosedPR(self.es_url, self.es_index,
                            start=self.start, end=self.end,
                            esfilters=esfilters_close, interval=self.interval)
          # For BMI we need when the ticket was closed
          closed.FIELD_DATE = 'closed_at'
          submitted = SubmittedPR(self.es_url, self.es_index,
                                  start=self.start, end=self.end,
                                  esfilters=esfilters_submit,
                                  interval=self.interval)
  
          return (closed, submitted)
docs: Each metric must have its own filters copy to modify it freely