是否可以使用 Terraform 为 AutoScaling 组的同一 CloudWatch 警报创建多个条件？

Question

This is my resource and I need it to follow 2 conditions:

ASG min size > threshold

ASG min size < threshold

resource "aws_cloudwatch_metric_alarm" "GroupMinSize" {
  count               = 1
  alarm_name          = "Autoscaling_Group_Min_Size"
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = "2"
  metric_name         = "GroupMinSize"
  namespace           = "AWS/AutoScaling"
  statistic           = "Minimum"
  period              = "120"
  threshold           = 1

  dimensions = {
    AutoScalingGroupName = aws_autoscaling_group.asg[count.index].name
  }

  alarm_description = "The minimum size of the Auto Scaling group"
}

Answer 1

According to AWS cloudformation documentation, comparison_operator is a string, therefore you cannot have multiple conditions. If cloudformation cannot do it, Terraform cannot do it either.

ComparisonOperator
The arithmetic operation to use when comparing the specified statistic and threshold. The specified statistic value is used as the first operand.

You can specify the following values: GreaterThanThreshold, GreaterThanOrEqualToThreshold, LessThanThreshold, or LessThanOrEqualToThreshold.

Required: Yes

Type: String

Allowed values: GreaterThanOrEqualToThreshold | GreaterThanThreshold | GreaterThanUpperThreshold | LessThanLowerOrGreaterThanUpperThreshold | LessThanLowerThreshold | LessThanOrEqualToThreshold | LessThanThreshold

However, you can combine multiple alarms to make a composite.

Cloudformation-documentation Terraform-documentation