docs: def available_metrics(self):
          """
          List all available metrics that you can add to this machine
  
          :returns: A list of dicts, each of which is a metric that you can add to a monitored machine
          """
          req = self.request(self.mist_client.uri+"/clouds/"+self.cloud.id+"/machines/"+self.id+"/metrics")
          metrics = req.get().json()
          return metrics