I deploy OpenStack Liberty on CentOS by installation guide and try create autoscaling example with resource OS::Ceilometer:Alarm

...
cpu_alarm_high:
      type: OS::Ceilometer::Alarm
      properties:
        meter_name: cpu_util
        statistic: avg
        period: 60
        evaluation_periods: 1
        threshold: 50
        alarm_actions:
            - {get_attr: [scaleup_policy, alarm_url]}
        comparison_operator: gt
...

but it fails with this error in heat-engine.log

2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource Traceback (most recent call last):
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource   File "/usr/lib/python2.7/site-packages/heat/engine/resource.py", line 612, in _action_recorder
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource     yield
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource   File "/usr/lib/python2.7/site-packages/heat/engine/resource.py", line 682, in _do_action
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource     yield self.action_handler_task(action, args=handler_args)
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource   File "/usr/lib/python2.7/site-packages/heat/engine/scheduler.py", line 292, in wrapper
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource     step = next(subtask)
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource   File "/usr/lib/python2.7/site-packages/heat/engine/resource.py", line 653, in action_handler_task
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource     handler_data = handler(*args)
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource   File "/usr/lib/python2.7/site-packages/heat/engine/resources/openstack/ceilometer/alarm.py", line 335, in handle_create
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource     alarm = self.client().alarms.create(**props)
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource   File "/usr/lib/python2.7/site-packages/heat/engine/resource.py", line 536, in client
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource     return self.stack.clients.client(client_name)
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource   File "/usr/lib/python2.7/site-packages/heat/engine/clients/__init__.py", line 57, in client
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource     return client_plugin.client()
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource   File "/usr/lib/python2.7/site-packages/heat/engine/clients/client_plugin.py", line 64, in client
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource     self._client = self._create()
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource   File "/usr/lib/python2.7/site-packages/heat/engine/clients/os/ceilometer.py", line 46, in _create
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource     return cc.get_client('2', **args)
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource   File "/usr/lib/python2.7/site-packages/ceilometerclient/client.py", line 395, in get_client
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource     return Client(version, endpoint, **kwargs)
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource   File "/usr/lib/python2.7/site-packages/ceilometerclient/client.py", line 359, in Client
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource     return client_class(*args, **client_kwargs)
2015-12-04 19:41:26.871 7105 ERROR heat.engine.resource ...