Add slack notification to cloudwatch alarms

monitoring/main.tf

@@ -17,6 +17,8 @@ module "core" {
 }
 
 locals {
+  alarm_actions = concat(var.alarm_actions, var.slack_webhook.url == "" ? [] : [module.notify_slack.slack_topic_arn])
+
   tags = merge(
     module.core.outputs.stack.tags,
     {
@@ -42,7 +44,7 @@ resource "aws_cloudwatch_metric_alarm" "load_balancer_5xx" {
   for_each              = toset(var.load_balancers)
 
   actions_enabled       = var.actions_enabled
-  alarm_actions         = var.alarm_actions
+  alarm_actions         = local.alarm_actions
   alarm_name            = "${each.key}-LoadBalancer5XX"
   comparison_operator   = "GreaterThanOrEqualToThreshold"
   evaluation_periods    = 3
@@ -64,7 +66,7 @@ resource "aws_cloudwatch_metric_alarm" "cpu_utilization" {
   for_each              = local.services
 
   actions_enabled       = var.actions_enabled
-  alarm_actions         = var.alarm_actions
+  alarm_actions         = local.alarm_actions
   alarm_name            = "${each.value.service}-CPUUtilization"
   comparison_operator   = "GreaterThanOrEqualToThreshold"
   evaluation_periods    = 3
@@ -86,7 +88,7 @@ resource "aws_cloudwatch_metric_alarm" "memory_utilization" {
   for_each              = local.services
 
   actions_enabled       = var.actions_enabled
-  alarm_actions         = var.alarm_actions
+  alarm_actions         = local.alarm_actions
   alarm_name            = "${each.value.service}-MemoryUtilization"
   comparison_operator   = "GreaterThanOrEqualToThreshold"
   evaluation_periods    = 3
@@ -102,4 +104,16 @@ resource "aws_cloudwatch_metric_alarm" "memory_utilization" {
   }
 
   tags = local.tags
+}
+
+data "aws_route53_zone" "status_zone" {
+  name = var.status_zone_name
+}
+
+resource "aws_route53_record" "honeybadger_status_page" {
+  zone_id   = data.aws_route53_zone.status_zone.id
+  name      = "status.${data.aws_route53_zone.status_zone.name}"
+  type      = "CNAME"
+  records   = ["status.hbuptime.com"]
+  ttl       = 300
 }

monitoring/slack_notification.tf

@@ -0,0 +1,11 @@
+module "notify_slack" {
+  source  = "terraform-aws-modules/notify-slack/aws"
+  version = "6.1.0"
+
+  create_sns_topic        = true
+  sns_topic_name          = "${module.core.outputs.stack.namespace}-slack-notification"
+  lambda_function_name    = "${module.core.outputs.stack.namespace}-slack-notification"
+  slack_channel           = var.slack_webhook.channel
+  slack_username          = var.slack_webhook.username
+  slack_webhook_url       = var.slack_webhook.url
+}

monitoring/variables.tf

@@ -17,3 +17,16 @@ variable "services" {
   type    = map(list(string))
   default = {}
 }
+
+variable "slack_webhook" {
+  type    = map(string)
+  default = {
+    channel   = ""
+    url       = ""
+    username  = ""
+  }
+}
+
+variable "status_zone_name" {
+  type    = string
+}