code: func (a *HistoricalApi) nodeList(request *restful.Request, response *restful.Response) {
  	if resp, err := a.historicalSource.GetNodes(); err != nil {
  		response.WriteError(http.StatusInternalServerError, err)
  	} else {
  		response.WriteEntity(resp)
  	}
  }
docs: // nodeList lists all nodes for which we have metrics