code: func (h *Helper) ScrapeHotInfo(rw string, allSchemas []*model.DBInfo) (map[TblIndex]RegionMetric, error) {
  	regionMetrics, err := h.FetchHotRegion(rw)
  	if err != nil {
  		return nil, err
  	}
  	return h.FetchRegionTableIndex(regionMetrics, allSchemas)
  }
docs: // ScrapeHotInfo gets the needed hot region information by the url given.