Belgium: Set GCP monthly budget alert

environments/_modules/gateway/billing.tf

@@ -0,0 +1,30 @@
+resource "google_billing_budget" "main" {
+  billing_account = var.gcp_billing_account_id
+  display_name    = "${data.google_project.main.name} (managed by Terraform workspace ${terraform.workspace})"
+
+  budget_filter {
+    projects = ["projects/${data.google_project.main.number}"]
+  }
+
+  amount {
+    specified_amount {
+      units         = var.gcp_billing_monthly_budget_usd
+      currency_code = "USD"
+    }
+  }
+
+  threshold_rules {
+    threshold_percent = 0.9
+  }
+  threshold_rules {
+    threshold_percent = 1.0
+    spend_basis       = "FORECASTED_SPEND"
+  }
+
+  all_updates_rule {
+    monitoring_notification_channels = [for channel in google_monitoring_notification_channel.sres_email : channel.name]
+    disable_default_iam_recipients   = true
+  }
+
+  depends_on = [google_project_service.services]
+}

environments/_modules/gateway/gcp.tf

@@ -0,0 +1,3 @@
+data "google_project" "main" {
+  project_id = var.gcp_project_id
+}

environments/_modules/gateway/services.tf

@@ -10,6 +10,7 @@ locals {
     "servicenetworking.googleapis.com",
     "redis.googleapis.com",
     "monitoring.googleapis.com",
+    "billingbudgets.googleapis.com",
   ]
 }
 

environments/_modules/gateway/variables.tf

@@ -7,6 +7,9 @@ variable "alert_email_addresses" {
   type = list(string)
 }
 
+variable "gcp_billing_account_id" {}
+variable "gcp_billing_monthly_budget_usd" {}
+
 variable "gcp_shared_infra_project_id" {}
 variable "gcp_project_id" {}
 variable "gcp_region" {

environments/belgium/gateway.tf

@@ -11,8 +11,10 @@ module "gateway" {
   mongodbatlas_project_id = var.mongodbatlas_project_id
   mongodbatlas_region     = "WESTERN_EUROPE"
 
-  alert_email_addresses = var.alert_email_addresses
-  sre_iam_uri           = var.sre_iam_uri
-
+  alert_email_addresses       = var.alert_email_addresses
+  sre_iam_uri                 = var.sre_iam_uri
   gcp_shared_infra_project_id = var.shared_infra_gcp_project_id
+
+  gcp_billing_monthly_budget_usd = 200
+  gcp_billing_account_id         = var.gcp_billing_account_id
 }

environments/belgium/variables.tf

@@ -3,6 +3,7 @@ variable "alert_email_addresses" {
   type = list(string)
 }
 
+variable "gcp_billing_account_id" {}
 variable "gcp_project_id" {}
 variable "shared_infra_gcp_project_id" {}