I have a complete loadbalanced ScalingGroup, but the time it takes to create or delete a new instance takes 10 minutes.

   Policy:
     type: OS::Heat::ScalingPolicy
     properties:
       adjustment_type: change_in_capacity
       auto_scaling_group_id: {get_resource: myServer_Group}
       cooldown: 30
       scaling_adjustment: 1

   Alarm:
     type: OS::Ceilometer::Alarm
     properties:
       meter_name: cpu_util
       statistic: avg
       period: 30
       evaluation_periods: 1
      threshold: 50
    alarm_actions:
     - {get_attr: [Policy, alarm_url]}
    comparison_operator: gt

So I set the Policy Cooldown to 30seconds and the period of the alarm also to 30seconds. I keep my Instance at 90% CPU so that the alarm should trigger within the first (or second) Period. Why does it stil take 10 minutes to trigger?

I hope that someone can explain me this events and thanks to everyone who help me with my Questions.

 ceilometer alarm-history -a 5507767f-1b31-461d-a6c1-9a855ebbdbb0

 +------------------+----------------------------+--------------------------------------------+
 | Type             | Timestamp                  | Detail                                     |
 +------------------+----------------------------+--------------------------------------------+
 | creation         | 2014-10-02T12:53:02.986000 | name: Scal-cpu_alarm_HIGH-zjhgpr3ct2qy     |
 |                  |                            | type: threshold                            |
 |                  |                            | rule: cpu_util > 50.0 during 1 x 60s       |
 | state transition | 2014-10-02T13:03:35.944000 | state: alarm                               |
 | state transition | 2014-10-02T13:05:35.942000 | state: insufficient data                   |
 | state transition | 2014-10-02T13:13:36.008000 | state: alarm                               |
 | state transition | 2014-10-02T13:15:36.004000 | state: insufficient data                   |
 +------------------+----------------------------+--------------------------------------------+