feat: add flags for grafana and alert manager (#171)

set default to not install grafana or alert manager, add config option to enable install

Author: overcookedpanda

modules/common/o11y/stage2/alertmanager.tf

@@ -1,4 +1,5 @@
 resource "kubernetes_manifest" "alertmanager" {
+  count = var.enable_alertmanager ? 1 : 0
   manifest = {
     "apiVersion" = "monitoring.coreos.com/v1"
     "kind"       = "Alertmanager"

modules/common/o11y/stage2/grafana.tf

@@ -1,4 +1,5 @@
 resource "kubernetes_config_map" "grafana_config" {
+  count = var.enable_grafana ? 1 : 0
   metadata {
     name      = "grafana-config"
     namespace = var.namespace
@@ -18,6 +19,7 @@ resource "kubernetes_config_map" "grafana_config" {
 }
 
 resource "kubernetes_stateful_set_v1" "grafana" {
+  count = var.enable_grafana ? 1 : 0
   metadata {
     name      = "grafana"
     namespace = var.namespace
@@ -163,6 +165,7 @@ resource "kubernetes_stateful_set_v1" "grafana" {
 }
 
 resource "kubernetes_service" "grafana" {
+  count = var.enable_grafana ? 1 : 0
   metadata {
     name      = "grafana"
     namespace = var.namespace

modules/common/o11y/stage2/variables.tf

@@ -6,3 +6,15 @@ variable "storage_class" {
   description = "storage class name to use for workload PVCs"
   default     = "gp"
 }
+
+variable "enable_grafana" {
+  description = "Flag to enable or disable Grafana installation"
+  type        = bool
+  default     = false
+}
+
+variable "enable_alertmanager" {
+  description = "Flag to enable or disable Alertmanager installation"
+  type        = bool
+  default     = false
+}

stage2/.terraform.lock.hcl

@@ -8,3 +8,5 @@
 # dmtrd_broker_urls = "redpanda-0.domain.name,redpanda-1.domain.name,redpanda-2.domain.name"
 # dmtrd_consumer_monitor_name = "your-consumer-monitor-name"
 # dmtrd_consumer_cache_name = "your-consumer-cache-name"
+# enable_grafana = false
+# enable_alertmanager = false

stage2/env.auto.tfvars.example

@@ -46,6 +46,8 @@ module "o11y" {
   source        = "../modules/common/o11y/stage2"
   namespace     = var.dmtr_namespace
   storage_class = var.cloud_provider == "gcp" ? "hyperdisk-balanced" : "gp"
+  enable_grafana = var.enable_grafana
+  enable_alertmanager = var.enable_alertmanager
 }
 
 module "dmtrd" {

stage2/main.tf

@@ -78,3 +78,15 @@ variable "dmtrd_replicas" {
   default     = 1
   description = "Amount of Demeter daemon replicas."
 }
+
+variable "enable_grafana" {
+  description = "Flag to enable or disable Grafana installation"
+  type        = bool
+  default     = false
+}
+
+variable "enable_alertmanager" {
+  description = "Flag to enable or disable Alertmanager installation"
+  type        = bool
+  default     = false
+}