Disable exception alerting when service is disabled

If SERVICE_ENABLED is false we put up a maintenence page which is a 503
response. This is considered an exception so it sets off our app
insights exception alert.

Instead we can just not enable this alert in this situation, however the
rest of the alerts are still enabled as the environment is still
running regardless of whether the app is serving normal requests.

Author: MatMoore

infrastructure/modules/container-apps/variables.tf

@@ -206,6 +206,10 @@ variable "relay_namespace_name" {
   default     = null
 }
 
+variable "env_vars_from_yaml" {
+  type = map(string)
+}
+
 locals {
   resource_group_name = "rg-${var.app_short_name}-${var.environment}-container-app-uks"
 
@@ -215,12 +219,9 @@ locals {
   database_name = "manage_breast_screening"
   # Here we expect the environment to be in format pr-XXX. For example PR 1234 would have environment pr-1234 and port 2234
   database_port = var.deploy_database_as_container ? try(tonumber(regex("\\d+", var.environment)), 24) + 1000 : 5432
-  env_vars_from_yaml = yamldecode(
-    file("${path.module}/../../environments/${var.env_config}/variables.yml")
-  )
-  external_url = "https://${module.frontdoor_endpoint.custom_domains["${var.environment}-domain"].host_name}/"
+  external_url  = "https://${module.frontdoor_endpoint.custom_domains["${var.environment}-domain"].host_name}/"
   common_env = merge(
-    local.env_vars_from_yaml,
+    var.env_vars_from_yaml,
     {
       SSL_MODE                                   = "require"
       DJANGO_ENV                                 = var.env_config

infrastructure/modules/infra/main.tf

@@ -80,7 +80,7 @@ module "app_insights_audit" {
   log_analytics_workspace_id = module.log_analytics_workspace_audit.id
 
   action_group_id = module.monitor_action_group.monitor_action_group.id
-  enable_alerting = var.enable_alerting
+  enable_alerting = var.enable_alerting && locals.env_vars_from_yaml["SERVICE_ENABLED"] != false
 }
 
 module "private_link_scoped_service_law" {

infrastructure/terraform/main.tf

@@ -60,6 +60,7 @@ module "container-apps" {
   enable_entra_id_authentication        = var.enable_entra_id_authentication
   environment                           = var.environment
   env_config                            = var.env_config
+  env_vars_from_yaml                    = local.env_vars_from_yaml
   fetch_secrets_from_app_key_vault      = var.fetch_secrets_from_app_key_vault
   deploy_infra                          = var.deploy_infra
   front_door_profile                    = var.front_door_profile

infrastructure/terraform/variables.tf

@@ -210,4 +210,8 @@ locals {
   resource_group_name  = "rg-${var.app_short_name}-${var.env_config}-uks"
   infra_key_vault_name = "kv-${var.app_short_name}-${var.env_config}-inf"
   infra_key_vault_rg   = "rg-${var.app_short_name}-${var.env_config}-infra"
+
+  env_vars_from_yaml = yamldecode(
+    file("${path.module}/../environments/${var.env_config}/variables.yml")
+  )
 }