initial commit

modules/ManagementGovernance/Monitoring.ASG/README.md

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+# Monitoring module 
+This module deploys the default cloudwatch metric monitoring
+
+## Notes
+Terraform lifecycle ignores tags to speed up terraform subsequent update. Cloudwatch alarm tags cannot be read on aws console anyway.
+
+## Example
+```terraform
+module "asg" {
+  source        = "../../modules/util/resource-list"
+  resource-type = "asg"
+}
+
+module "asg-monitoring" {
+  cw-alarm-prefix          = local.cw-alarm-prefix
+  for_each                 = module.asg.result-set
+  source                   = "../../modules/ManagementGovernance/Monitoring.ASG"
+  default-tags             = local.default-tags
+  asg-name                 = each.value
+  threshold-CPUUtilization = 90
+  actions-enabled          = var.actions-enabled
+  sns-targets              = var.sns-targets
+}
+```

modules/ManagementGovernance/Monitoring.ASG/main.tf

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+data "aws_autoscaling_group" "asg" {
+  name     = var.asg-name
+}
+
+resource "aws_cloudwatch_metric_alarm" "asg-CPUUtilization" {
+  alarm_name                = "${var.settings.CPUUtilization.ecccode}-ASG_${var.asg-name}-CPUUtilization"
+  comparison_operator       = var.settings.CPUUtilization.comparison_operator
+  evaluation_periods        = var.settings.CPUUtilization.evaluation_periods
+  metric_name               = "CPUUtilization"
+  period                    = var.settings.CPUUtilization.period
+  statistic                 = var.settings.CPUUtilization.statistic
+  threshold                 = var.settings.CPUUtilization.threshold
+  alarm_description         = "ASG:CPUUtilization"
+  namespace                 = "AWS/EC2"
+  insufficient_data_actions = []
+  actions_enabled           = var.actions-enabled
+  alarm_actions             = [var.settings.CPUUtilization.action]
+  ok_actions                = [var.settings.CPUUtilization.action]
+  dimensions = {
+    AutoScalingGroupName =var.asg-name
+  }
+}
+
+resource "aws_cloudwatch_metric_alarm" "asg-GroupInServiceCapacity" {
+  alarm_name                = "${var.settings.GroupInServiceCapacity.ecccode}-ASG_${var.asg-name}-GroupInServiceCapacity"
+  comparison_operator       = "LessThanThreshold"
+  evaluation_periods        = var.settings.GroupInServiceCapacity.evaluation_periods
+  metric_name               = "GroupInServiceCapacity"
+  period                    = var.settings.GroupInServiceCapacity.period
+  statistic                 = "Minimum"
+  threshold                 = data.aws_autoscaling_group.asg.min_size
+  alarm_description         = "ASG:GroupInServiceCapacity"
+  namespace                 = "AWS/AutoScaling"
+  insufficient_data_actions = []
+  actions_enabled           = var.actions-enabled
+  alarm_actions             = [var.settings.GroupInServiceCapacity.action]
+  ok_actions                = [var.settings.GroupInServiceCapacity.action]
+  dimensions = {
+    AutoScalingGroupName = var.asg-name
+  }
+}

modules/ManagementGovernance/Monitoring.ASG/provider.tf

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+terraform {
+  required_version = "~> 1.3.0"
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 4.36.1"
+    }
+  }
+}

modules/ManagementGovernance/Monitoring.ASG/variables.tf

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+variable cw-alarm-prefix {}
+variable actions-enabled {}
+variable asg-name {}
+variable settings {}
+variable ecccode {}