docs: def list_machines(self):
          """Retrieve a list of machines in the fleet cluster
  
          Yields:
              Machine: The next machine in the cluster
  
          Raises:
              fleet.v1.errors.APIError: Fleet returned a response code >= 400
  
          """
          # loop through each page of results
          for page in self._request('Machines.List'):
              # return each machine in the current page
              for machine in page.get('machines', []):
                  yield Machine(data=machine)