resource "aws_cloudwatch_metric_alarm" "target_healthy_count" {
  alarm_name          = "ELB-target-healthy-count"
  comparison_operator = "LessThanOrEqualToThreshold"
  evaluation_periods  = "1"
  metric_name         = "HealthyHostCount"
  period              = "60"
  statistic           = "Average"
  threshold           = "0"

  dimensions {
    LoadBalancer = "${aws_elb.app_elb.id}"
  }

  alarm_description = "Trigger an alert when elb has 1 or more unhealthy hosts"

  #alarm_actions = "Would point at sns here"
  #ok_actions = "Would also point at sns"
  treat_missing_data = "breaching"
}

resource "aws_autoscaling_policy" "app_as_policy" {
  name                   = "app_autoscaling_policy"
  scaling_adjustment     = 1
  adjustment_type        = "ChangeInCapacity"
  cooldown               = 300
  autoscaling_group_name = "${aws_autoscaling_group.app_asg.name}"
}

resource "aws_cloudwatch_metric_alarm" "app_asg_alarm" {
  alarm_name          = "app_asg_alarm"
  comparison_operator = "GreaterThanOrEqualToThreshold"
  evaluation_periods  = "2"
  metric_name         = "CPUUtilization"
  namespace           = "AWS/EC2"
  period              = "120"
  statistic           = "Average"
  threshold           = "80"

  dimensions = {
    AutoScalingGroupName = "${aws_autoscaling_group.app_asg.name}"
  }

  alarm_description = "This metric monitors ec2 cpu utilization"
  alarm_actions     = ["${aws_autoscaling_policy.app_as_policy.arn}"]
}