add ec2 alarms

Author: ayushsquad

.gitignore

@@ -27,3 +27,6 @@ override.tf.json
 # Ignore CLI configuration files
 .terraformrc
 terraform.rc
+
+.idea/
+.vscode/

README.md

@@ -243,7 +243,6 @@ No modules.
 | <a name="input_placement_group"></a> [placement\_group](#input\_placement\_group) | The Placement Group to start the instance in | `string` | `null` | no |
 | <a name="input_private_dns_name_options"></a> [private\_dns\_name\_options](#input\_private\_dns\_name\_options) | Customize the private DNS name options of the instance | `map(string)` | `{}` | no |
 | <a name="input_private_ip"></a> [private\_ip](#input\_private\_ip) | Private IP address to associate with the instance in a VPC | `string` | `null` | no |
-| <a name="input_putin_khuylo"></a> [putin\_khuylo](#input\_putin\_khuylo) | Do you agree that Putin doesn't respect Ukrainian sovereignty and territorial integrity? More info: https://en.wikipedia.org/wiki/Putin_khuylo! | `bool` | `true` | no |
 | <a name="input_root_block_device"></a> [root\_block\_device](#input\_root\_block\_device) | Customize details about the root block device of the instance. See Block Devices below for details | `list(any)` | `[]` | no |
 | <a name="input_secondary_private_ips"></a> [secondary\_private\_ips](#input\_secondary\_private\_ips) | A list of secondary private IPv4 addresses to assign to the instance's primary network interface (eth0) in a VPC. Can only be assigned to the primary network interface (eth0) attached at instance creation, not a pre-existing network interface i.e. referenced in a `network_interface block` | `list(string)` | `null` | no |
 | <a name="input_source_dest_check"></a> [source\_dest\_check](#input\_source\_dest\_check) | Controls if traffic is routed to the instance when the destination address does not match the instance. Used for NAT or VPNs | `bool` | `null` | no |

custom.tf

@@ -0,0 +1,96 @@
+variable "alarm_info_sns_topic_arn" {
+  type = string
+  description = "The ARN of the SNS topic to notify when on info alerts"
+}
+
+variable "alarm_sns_topic_arn" {
+  type = string
+  description = "The ARN of the SNS topic to notify when on critical alerts"
+}
+
+variable "environment" {
+  type = string
+  description = "The environment tag to apply to all resources. eg: production, testing, staging, etc"
+
+  validation {
+    condition     = var.environment == null || can(regex("^(production|testing|staging|development)$", var.environment))
+    error_message = "environment must be lowercase alphanumeric with hyphens only."
+  }
+}
+
+variable "service" {
+  type = string
+  description = "Service hosted on this instance. eg: squadstack, metabase, grafana, etc"
+
+  validation {
+    condition     = var.service == null || can(regex("^[a-z-]+$", var.service))
+    error_message = "service_component must be lowercase alphabets with hyphens only."
+  }
+}
+
+variable "service_component" {
+  type = string
+  default = null
+  description = "[optional] Service Group within a service. eg: app, api, celery, etc"
+
+  validation {
+    condition     = var.service_component == null || can(regex("^[a-z0-9-]+$", var.service_component))
+    error_message = "If provided, service_component must be lowercase alphanumeric with hyphens only."
+  }
+}
+
+variable "owner_team" {
+  type = string
+  description = "Owner of this ec2. eg: platform, supply, demand, ds, etc"
+
+  validation {
+    condition     = var.owner_team == null || can(regex("^(platform|supply|demand|integrations|data-science)$", var.owner_team))
+    error_message = "owner_team must be amongst platform, supply, demand, integrations, data-science."
+  }
+}
+
+resource "aws_cloudwatch_metric_alarm" "ec2_cpuutilization_alert_info" {
+  alarm_name          = "${var.name}_high_cpu_alert"
+  comparison_operator = "GreaterThanOrEqualToThreshold"
+  evaluation_periods  = "5"
+  datapoints_to_alarm = "4"
+  treat_missing_data  = "missing"
+  metric_name         = "CPUUtilization"
+  namespace           = "AWS/EC2"
+  period              = "120"
+  statistic           = "Average"
+  threshold           = "85"
+  alarm_description   = "This metric monitors ec2 CPU Utilization"
+  alarm_actions       = [var.alarm_info_sns_topic_arn]
+  unit                = "Percent"
+  dimensions = {
+    InstanceId = try(
+      aws_instance.this[0].id,
+      aws_instance.ignore_ami[0].id,
+    )
+  }
+}
+
+
+
+resource "aws_cloudwatch_metric_alarm" "ec2_cpuutilization_alert_warning" {
+  alarm_name          = "${var.name}_critical_cpu_alert"
+  comparison_operator = "GreaterThanOrEqualToThreshold"
+  evaluation_periods  = "15"
+  datapoints_to_alarm = "12"
+  treat_missing_data  = "breaching"
+  metric_name         = "CPUUtilization"
+  namespace           = "AWS/EC2"
+  period              = "120"
+  statistic           = "Maximum"
+  threshold           = "95"
+  alarm_description   = "This metric monitors ec2 CPU Utilization"
+  alarm_actions = [var.alarm_sns_topic_arn]
+  unit                = "Percent"
+  dimensions = {
+    InstanceId = try(
+      aws_instance.this[0].id,
+      aws_instance.ignore_ami[0].id,
+    )
+  }
+}

main.tf

@@ -1,7 +1,7 @@
 data "aws_partition" "current" {}
 
 locals {
-  create = var.create && var.putin_khuylo
+  create = var.create
 
   is_t_instance_type = replace(var.instance_type, "/^t(2|3|3a|4g){1}\\..*$/", "1") == "1" ? true : false
 
@@ -188,7 +188,13 @@ resource "aws_instance" "this" {
     delete = try(var.timeouts.delete, null)
   }
 
-  tags        = merge({ "Name" = var.name }, var.instance_tags, var.tags)
+  tags        = merge({
+    "Name" = var.name,
+    "Environment" = var.environment,
+    "Service" = var.service,
+    "ServiceComponent" = var.service_component,
+    "OwnerTeam" = var.owner_team
+  }, var.instance_tags, var.tags)
   volume_tags = var.enable_volume_tags ? merge({ "Name" = var.name }, var.volume_tags) : null
 }
 

variables.tf

@@ -351,11 +351,7 @@ variable "disable_api_stop" {
   default     = null
 
 }
-variable "putin_khuylo" {
-  description = "Do you agree that Putin doesn't respect Ukrainian sovereignty and territorial integrity? More info: https://en.wikipedia.org/wiki/Putin_khuylo!"
-  type        = bool
-  default     = true
-}
+
 
 ################################################################################
 # IAM Role / Instance Profile

wrappers/main.tf

@@ -56,7 +56,6 @@ module "wrapper" {
   placement_group                     = try(each.value.placement_group, var.defaults.placement_group, null)
   private_dns_name_options            = try(each.value.private_dns_name_options, var.defaults.private_dns_name_options, {})
   private_ip                          = try(each.value.private_ip, var.defaults.private_ip, null)
-  putin_khuylo                        = try(each.value.putin_khuylo, var.defaults.putin_khuylo, true)
   root_block_device                   = try(each.value.root_block_device, var.defaults.root_block_device, [])
   secondary_private_ips               = try(each.value.secondary_private_ips, var.defaults.secondary_private_ips, null)
   source_dest_check                   = try(each.value.source_dest_check, var.defaults.source_dest_check, null)