code: func (a *HistoricalApi) availableNodeMetrics(request *restful.Request, response *restful.Response) {
  	key := core.HistoricalKey{
  		ObjectType: core.MetricSetTypeNode,
  		NodeName:   request.PathParameter("node-name"),
  	}
  	a.processMetricNamesRequest(key, response)
  }
docs: // availableNodeMetrics returns a list of available node metric names.