data "external" "alb-targetgroups" {
  program = ["bash", "../../modules/ManagementGovernance/Monitoring.ALB/list-alb-targetgroups.sh"]
  query = {
    lb = var.load-balancer
  }
}

resource "aws_cloudwatch_metric_alarm" "alb-HealthyHostCount" {
  for_each                  = toset(split(" ", data.external.alb-targetgroups.result.result))
  alarm_name                = "${var.cw-alarm-prefix}:ALBTG:HealthyHostCount:${split("/", each.value)[1]}/${split("/", each.value)[2]}"
  comparison_operator       = "LessThanThreshold"
  evaluation_periods        = "1"
  metric_name               = "HealthyHostCount"
  period                    = "300"
  statistic                 = "Minimum"
  threshold                 = var.threshold-HealthHostCountMin
  alarm_description         = "ALBTG:HealthyHostCount"
  namespace                 = "AWS/ApplicationELB"
  insufficient_data_actions = []
  actions_enabled           = var.actions-enabled
  alarm_actions             = [var.sns-targets.alarm-actions-emergency]
  ok_actions                = [var.sns-targets.alarm-actions-emergency]
  dimensions = {
    TargetGroup  = "targetgroup/${split("/", each.value)[1]}/${split("/", each.value)[2]}"
    LoadBalancer = "app/${split("/", var.load-balancer)[2]}/${split("/", var.load-balancer)[3]}"
  }
  tags = var.default-tags
  lifecycle {
    ignore_changes = [tags]
  }
}