allow disabling creation of alertmanager definition

Author: minaslater

aws/telemetry/main.tf

@@ -18,12 +18,13 @@ module "sns_topics" {
 module "prometheus_workspace" {
   source = "./modules/prometheus-workspace"
 
-  alert_group_by         = var.alert_group_by
-  alert_message_template = var.alert_message_template
-  alert_resolve_timeout  = var.alert_resolve_timeout
-  alert_subject_template = var.alert_subject_template
-  name                   = var.prometheus_workspace_name
-  tags                   = var.tags
+  alert_group_by              = var.alert_group_by
+  alert_message_template      = var.alert_message_template
+  alert_resolve_timeout       = var.alert_resolve_timeout
+  alert_subject_template      = var.alert_subject_template
+  alertmanager_config_enabled = var.alertmanager_config_enabled
+  name                        = var.prometheus_workspace_name
+  tags                        = var.tags
 
   sns_receivers = merge({
     default = module.sns_topics.arns["alertmanager-${var.alert_default_severity}${var.sns_topic_name_suffix}"]

aws/telemetry/modules/prometheus-workspace/main.tf

@@ -51,6 +51,7 @@ data "aws_iam_policy_document" "ingestion_assume_role" {
 }
 
 resource "aws_prometheus_alert_manager_definition" "this" {
+  count = var.alertmanager_config_enabled ? 1 : 0
   definition   = yamlencode(local.alert_manager_definition)
   workspace_id = aws_prometheus_workspace.this.id
 }

aws/telemetry/modules/prometheus-workspace/variables.tf

@@ -22,6 +22,12 @@ variable "alert_subject_template" {
   default     = null
 }
 
+variable "alertmanager_config_enabled" {
+  description = "Enable alertmanager configs for the Prometheus workspace"
+  type        = bool
+  default     = true
+}
+
 variable "name" {
   description = "Name for this Prometheus workspace"
   type        = string

aws/telemetry/variables.tf

@@ -40,6 +40,12 @@ variable "alert_default_severity" {
   default     = "warning"
 }
 
+variable "alertmanager_config_enabled" {
+  description = "Enable alertmanager configs for the Prometheus workspace"
+  type        = bool
+  default     = true
+}
+
 variable "grafana_role_name" {
   description = "Name of the IAM role created for Grafana"
   type        = string