如何删除附加到不存在实例的cloudwatch警报

Question

当我创建新的EC2实例时，我使用可靠的动态库存来创建新的cloudwatch度量警报。到目前为止还不错：

- name: set AWS CloudWatch alarms
  hosts: tag_env_production
  vars:
    alarm_slack: 'arn:aws:sns:123:metrics-alarms-slack'
  tasks:
    - name: "CPU > 70%"
      ec2_metric_alarm:
        state: present
        name: "{{ ec2_tag_Name }}-CPU"
        region: "{{ ec2_region }}"
        dimensions:
          InstanceId: '{{ ec2_id }}'
        namespace: "AWS/EC2"
        metric: CPUUtilization
        statistic: Average
        comparison: ">="
        threshold: 70.0
        unit: Percent
        period: 300
        evaluation_periods: 1
        description: Triggered when CPU utilization is more than 70% for 5 minutes
        alarm_actions: ['{{ alarm_slack }}']
      when: ec2_tag_group == 'lazyservers'

执行如下：

ansible-playbook -v ec2_alarms.yml -i inventories/ec2/ec2.py

创建新实例后，我会删除旧实例（手动）。问题是，我需要删除连接到旧实例的现有度量的警报。

我是错过了什么，还是无法通过动态库存做到这一点？

我目前的想法是删除处于"正在终止"状态的实例的度量，但缺点是，如果我在这些实例终止后运行剧本，它们将不可见。

Answer 1

在删除实例之前，删除警报，尝试使用以下方法：

- name: delete alarm
  ec2_metric_alarm:
    state: absent
    region: ap-southeast-2
    name: "cpu-low"
    metric: "CPUUtilization"
    namespace: "AWS/EC2"
    statistic: Average
    comparison: "<="
    threshold: 5.0
    period: 300
    evaluation_periods: 3
    unit: "Percent"
    description: "This will alarm when a bamboo slave's cpu usage average is lower than 5% for 15 minutes "
    dimensions: {'InstanceId':'{{ instance_id }}'}
    alarm_actions: ["action1","action2"]