cloud_watch_alarm.tf

# Restart dead or hung instance

resource "null_resource" "check_alarm_action" {
  count = "${local.instance_count}"

  triggers = {
    action = "arn:aws:swf:${local.region}:${data.aws_caller_identity.default.account_id}:${var.default_alarm_action}"
  }
}

resource "aws_cloudwatch_metric_alarm" "default" {
  count               = "${local.instance_count}"
  alarm_name          = "${module.label.id}"
  comparison_operator = "${var.comparison_operator}"
  evaluation_periods  = "${var.evaluation_periods}"
  metric_name         = "${var.metric_name}"
  namespace           = "${var.metric_namespace}"
  period              = "${var.applying_period}"
  statistic           = "${var.statistic_level}"
  threshold           = "${var.metric_threshold}"
  depends_on          = ["null_resource.check_alarm_action"]

  dimensions {
    InstanceId = "${aws_instance.default.id}"
  }

  alarm_actions = [
    "${null_resource.check_alarm_action.triggers.action}",
  ]
}