Support aodh composite alarm in heat¶

https://blueprints.launchpad.net/heat/+spec/add-aodh-composite-alarm

Adds resource plugin for Aodh composite alarm.

Problem description¶

The combination type alarm has been deprecated in aodh, because some issues which are hard to solved. And we have deprecated OS::Aodh::CombinationAlarm synchronously, see:

https://blueprints.launchpad.net/heat/+spec/migrate-to-use-aodh-for-alarms

It’s recommended to use composite rule alarm which is similar with the combination alarm in functionality.

Proposed change¶

Add the following resource under resources/openstack/aodh/

OS::Aodh::CompositeAlarm
- description
  Description of the alarm. - optional - type: String - update_allowed
- severity
  Severity of the alarm. - optional - type: Integer - update_allowed - constraints: one of [‘low’, ‘moderate’, ‘critical’] - default: low
- enabled
  True if alarm evaluation is enabled. - optional - type: Boolean - update_allowed - default: True
- alarm_actions
  A list of URLs (webhooks) to invoke when state transitions to alarm. - optional - type: List - update_allowed
- ok_actions
  A list of URLs (webhooks) to invoke when state transitions to ok. - optional - type: List - update_allowed
- insufficient_data_actions
  A list of URLs (webhooks) to invoke when state transitions to insufficient-data. - optional - type: List - update_allowed
- repeat_actions
  True if actions should be repeatedly notified while alarm remains in target state. - optional - type: Boolean - update_allowed - default: True
- time_constraints
  Describe time constraints for the alarm. - optional - type: List
- composite_rule
  Composite threshold rule with JSON format. - required - type: Map - update_allowed - schema: {‘operator’: ‘or’/’and’, ‘rules’: [rule1, rule2…]}

The following is an example of composite alarm:

Resources:
  my_composite_alarm:
    type: OS::Aodh::CompositeAlarm
    properties:
      composite_rule:
        operator: or
        rules:
        - type: threshold
          meter_name: cpu_util
          evaluation_periods: 1
          period: 60
          statistic: avg
          threshold: 0.8
          comparison_operator: ge
          exclude_outliers: false
        - and:
          - type: threshold
            meter_name: disk.usage
            evaluation_periods: 1
            period: 60
            statistic: avg
            threshold: 0.8
            comparison_operator: ge
            exclude_outliers: false
          - type: threshold
            meter_name: mem_util
            evaluation_periods: 1
            period: 60
            statistic: avg
            threshold: 0.8
            comparison_operator: ge
            exclude_outliers: false
      description: a composite alarm
      ...... (other properties)

Alternatives¶

None

Implementation¶

Assignee(s)¶

Primary assignee:: huangtianhua@huawei.com

Milestones¶

Target Milestone for completion:: ocata-1

Work Items¶

Add OS::Aodh::CompositeAlarm resource
Add related tests
Add sample template using OS::Aodh::CompositeAlarm in heat-templates

Dependencies¶