docs: def get(self, instance_ids=None, filters=None):
          """List instance info."""
          params = {}
          if filters:
              params["filters"] = make_filters(filters)
          if instance_ids:
              params['InstanceIds'] = instance_ids
          reservations = self.call("DescribeInstances",
                                   response_data_key="Reservations",
                                   **params)
          if reservations:
              return list(chain(*(r["Instances"] for r in reservations)))
          return []