terraform.aws-baseline-infra/modules/ManagementGovernance/Monitoring.NLB/main.tf

/*
data "external" "nlb-targetgroups" {
  program = ["bash", "${path.module}/list-nlb-targetgroups.sh"]
  query = {
    parameter = var.load-balancer
  }
}
*/
locals {
  nlb-name = "net/${split("/", var.load-balancer)[2]}/${split("/", var.load-balancer)[3]}"
}

resource "aws_cloudwatch_metric_alarm" "nlb-TCP_Target_Reset_Count" {
  alarm_name                = "${var.settings.TCP_Target_Reset_Count.ecccode}-NLB_${local.nlb-name}-TCP_Target_Reset_Count"
  comparison_operator       = var.settings.TCP_Target_Reset_Count.comparison_operator
  evaluation_periods        = var.settings.TCP_Target_Reset_Count.evaluation_periods
  metric_name               = "TCP_Target_Reset_Count"
  period                    = var.settings.TCP_Target_Reset_Count.period
  statistic                 = var.settings.TCP_Target_Reset_Count.statistic
  threshold                 = var.settings.TCP_Target_Reset_Count.threshold
  alarm_description         = "NLB:TCP_Target_Reset_Count"
  namespace                 = "AWS/NetworkELB"
  insufficient_data_actions = []
  actions_enabled           = var.actions-enabled
  alarm_actions             = [var.settings.TCP_Target_Reset_Count.action]
  ok_actions                = [var.settings.TCP_Target_Reset_Count.action]
  dimensions = {
    LoadBalancer = local.nlb-name
  }
}

/*
module "nlb-targetgroups" {
  source        = "../../util/resource-list"
  resource-type = "nlb-targetgroups"
  query-input   = var.load-balancer
  asrolearn     = var.asrolearn
}
*/

// causes Rate exceeded error, maybe because of adaptive AWS_RETRY_MODE?

/*
module "nlb_tgs" {
  assume_role_arn   = var.asrolearn
  role_session_name = "terraform-resource-list"
  source            = "../../util/terraform-aws-cli"
  aws_cli_commands  = ["elbv2", "describe-target-groups", "--load-balancer-arn", var.load-balancer]
  aws_cli_query     = "TargetGroups[*].TargetGroupArn"
}
*/

module nlb_tgs {
  source = "../../util/awscli"
  access_key       = var.target-account-ak
  aws_cli_commands = "elbv2 describe-target-groups --load-balancer-arn ${var.load-balancer} --query TargetGroups[*].TargetGroupArn"
  secret_key       = var.target-account-sk
  session_token    = var.target-account-token
}


resource "aws_cloudwatch_metric_alarm" "nlb-HealthyHostCount" {
  # for_each = module.nlb-targetgroups.result-set
  for_each                  = toset(module.nlb_tgs.awscliout)
  alarm_name                = "${var.settings.HealthHostCountMin.ecccode}-NLBTG_${split(":", each.value)[5]}-HealthyHostCount"
  comparison_operator       = var.settings.HealthHostCountMin.comparison_operator
  evaluation_periods        = var.settings.HealthHostCountMin.evaluation_periods
  metric_name               = "HealthyHostCount"
  period                    = var.settings.HealthHostCountMin.period
  statistic                 = var.settings.HealthHostCountMin.statistic
  threshold                 = var.settings.HealthHostCountMin.threshold
  alarm_description         = "NLBTG:HealthyHostCount"
  namespace                 = "AWS/NetworkELB"
  insufficient_data_actions = []
  actions_enabled           = var.actions-enabled
  alarm_actions             = [var.settings.HealthHostCountMin.action]
  ok_actions                = [var.settings.HealthHostCountMin.action]
  dimensions = {
    TargetGroup  = split(":", each.value)[5]
    LoadBalancer = "net/${split("/", var.load-balancer)[2]}/${split("/", var.load-balancer)[3]}"
  }
}


resource "aws_cloudwatch_metric_alarm" "nlb-UnHealthyHostCount" {
  # for_each = module.nlb-targetgroups.result-set
  for_each                  = toset(module.nlb_tgs.awscliout)
  alarm_name                = "${var.settings.UnHealthyHostCount.ecccode}-NLBTG_${split(":", each.value)[5]}-UnHealthyHostCount"
  comparison_operator       = var.settings.UnHealthyHostCount.comparison_operator
  evaluation_periods        = var.settings.UnHealthyHostCount.evaluation_periods
  metric_name               = "UnHealthyHostCount"
  period                    = var.settings.UnHealthyHostCount.period
  statistic                 = var.settings.UnHealthyHostCount.statistic
  threshold                 = var.settings.UnHealthyHostCount.threshold
  alarm_description         = "NLBTG:UnHealthyHostCount"
  namespace                 = "AWS/NetworkELB"
  insufficient_data_actions = []
  actions_enabled           = var.actions-enabled
  alarm_actions             = [var.settings.UnHealthyHostCount.action]
  ok_actions                = [var.settings.UnHealthyHostCount.action]
  dimensions = {
    TargetGroup  = split(":", each.value)[5]
    LoadBalancer = "net/${split("/", var.load-balancer)[2]}/${split("/", var.load-balancer)[3]}"
  }
}