initial commit

modules/ManagementGovernance/Monitoring.TGW/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 "tgw" {
+  source        = "../../modules/util/resource-list"
+  resource-type = "tgw"
+}
+
+module "tgw-monitoring" {
+  cw-alarm-prefix               = local.cw-alarm-prefix
+  for_each                      = module.tgw.result-set
+  source                        = "../../modules/ManagementGovernance/Monitoring.TGW"
+  default-tags                  = local.default-tags
+  job-flow-id                   = split("/", each.value)[1]
+  threshold-PacketDropCountNoRoute = 1
+  actions-enabled               = var.actions-enabled
+  sns-targets = var.sns-targets
+}
+```

modules/ManagementGovernance/Monitoring.TGW/main.tf

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+resource "aws_cloudwatch_metric_alarm" "tgw-PacketDropCountNoRoute" {
+  for_each                  = var.settings
+  alarm_name                = "${each.value["ecccode"]}-TGW_${var.tgw-id}-PacketDropCountNoRoute"
+  comparison_operator       = each.value["comparison_operator"]
+  evaluation_periods        = each.value["evaluation_periods"]
+  metric_name               = each.value["metric"]
+  period                    = each.value["period"]
+  statistic                 = each.value["statistic"]
+  threshold                 = each.value["threshold"]
+  alarm_description         = "TGW:${each.value["metric"]}"
+  namespace                 = "AWS/TransitGateway"
+  insufficient_data_actions = []
+  actions_enabled           = var.actions-enabled
+  alarm_actions             = [each.value["action"]]
+  ok_actions                = [each.value["action"]]
+  dimensions = {
+    TransitGateway = var.tgw-id
+  }
+}

modules/ManagementGovernance/Monitoring.TGW/provider.tf

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+terraform {
+  required_version = "~> 1.3.0"
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 4.47.0"
+    }
+  }
+}

modules/ManagementGovernance/Monitoring.TGW/variables.tf

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+variable cw-alarm-prefix {}
+variable actions-enabled {}
+variable tgw-id {}
+variable settings {}