Merged in MON-76_azure_redis (pull request #10)

MON-76: Azure Redis - DataDog Monitors

Approved-by: Jérôme Respaut <shr3ps@gmail.com>
Approved-by: Laurent Piroelle <laurent.piroelle@fr.clara.net>
Approved-by: Alexandre Gaillet <alexandre.gaillet@fr.clara.net>
Approved-by: Quentin Manfroi <quentin.manfroi@yahoo.fr>
Approved-by: Adrien Broyere <adrien.broyere@fr.clara.net>

cloud/azure/redis/README.md

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+Azure Redis DataDog monitors
+============================
+
+How to use this module
+----------------------
+
+```
+module "datadog-monitors-azure-redis" {
+  source = "git::ssh://git@bitbucket.org/morea/terraform.feature.datadog.git//cloud/azure/redis?ref={revision}"
+
+  message     = "${module.datadog-message-alerting.alerting-message}"
+  environment = "${var.environment}"
+}
+```
+
+Purpose
+-------
+Creates a DataDog monitors with the following checks :
+
+* Service status check
+* Evicted keys count check
+* Processor time (percent) threshold
+* Server CPU load threshold
+
+Inputs
+------
+
+| Name | Description | Type | Default | Required |
+|------|-------------|:----:|:-----:|:-----:|
+| delay | Delay in seconds for the metric evaluation | string | `600` | no |
+| environment | Architecture environment | string | - | yes |
+| evictedkeys_limit_threshold_critical | Evicted keys limit (critical threshold) | string | `100` | no |
+| evictedkeys_limit_threshold_warning | Evicted keys limit (warning threshold) | string | `0` | no |
+| filter_tags_custom | Tags used for custom filtering when filter_tags_use_defaults is false | string | `*` | no |
+| filter_tags_use_defaults | Use default filter tags convention | string | `true` | no |
+| message | Message sent when a Redis monitor is triggered | string | - | yes |
+| percent_processor_time_threshold_critical | Processor time percent (critical threshold) | string | `80` | no |
+| percent_processor_time_threshold_warning | Processor time percent (warning threshold) | string | `60` | no |
+| server_load_rate_threshold_critical | Server CPU load rate (critical threshold) | string | `90` | no |
+| server_load_rate_threshold_warning | Server CPU load rate (warning threshold) | string | `70` | no |
+
+Related documentation
+---------------------
+
+DataDog documentation: [https://docs.datadoghq.com/integrations/azure_redis_cache/](https://docs.datadoghq.com/integrations/azure_redis_cache/)
+
+Azure Redis metrics documentation: [https://docs.microsoft.com/en-us/azure/redis-cache/cache-how-to-monitor](https://docs.microsoft.com/en-us/azure/redis-cache/cache-how-to-monitor)

cloud/azure/redis/inputs.tf

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+# Global Terraform
+variable "environment" {
+  description = "Architecture environment"
+  type = "string"
+}
+
+# Global DataDog
+variable "message" {
+  description = "Message sent when a Redis monitor is triggered"
+}
+
+variable "delay" {
+  description = "Delay in seconds for the metric evaluation"
+  default     = 600
+}
+
+variable "filter_tags_use_defaults" {
+  description = "Use default filter tags convention"
+  default     = "true"
+}
+
+variable "filter_tags_custom" {
+  description = "Tags used for custom filtering when filter_tags_use_defaults is false"
+  default     = "*"
+}
+
+# Azure Redis specific
+variable "evictedkeys_limit_threshold_warning" {
+  description = "Evicted keys limit (warning threshold)"
+  default     = 0
+}
+
+variable "evictedkeys_limit_threshold_critical" {
+  description = "Evicted keys limit (critical threshold)"
+  default     = 100
+}
+
+variable "percent_processor_time_threshold_critical" {
+  description = "Processor time percent (critical threshold)"
+  default     = 80
+}
+
+variable "percent_processor_time_threshold_warning" {
+  description = "Processor time percent (warning threshold)"
+  default     = 60
+}
+
+variable "server_load_rate_threshold_critical" {
+  description = "Server CPU load rate (critical threshold)"
+  default     = 90
+}
+
+variable "server_load_rate_threshold_warning" {
+  description = "Server CPU load rate (warning threshold)"
+  default     = 70
+}

cloud/azure/redis/monitors-azure-redis.tf

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+data "template_file" "filter" {
+  template = "$${filter}"
+
+  vars {
+    filter = "${var.filter_tags_use_defaults == "true" ? format("dd_monitoring:enabled,dd_azure_redis:enabled,env:%s", var.environment) : "${var.filter_tags_custom}"}"
+  }
+}
+
+resource "datadog_monitor" "status" {
+  name    = "[${var.environment}] Redis {{name}} is down"
+  message = "${var.message}"
+
+  query = <<EOF
+    avg(last_5m):avg:azure.cache_redis.status{${data.template_file.filter.rendered}} by {name,resource_group} != 1
+EOF
+
+  type = "metric alert"
+
+  notify_no_data      = true
+  evaluation_delay    = "${var.delay}"
+  renotify_interval   = 0
+  notify_audit        = false
+  timeout_h           = 0
+  include_tags        = true
+  locked              = false
+  require_full_window = true
+  new_host_delay      = "${var.delay}"
+  no_data_timeframe   = 20
+
+  tags = ["env:${var.environment}", "resource:redis", "team:azure", "provider:azure"]
+}
+
+resource "datadog_monitor" "evictedkeys" {
+  name    = "[${var.environment}] Redis {{value}} evictedkeys on {{name}}"
+  message = "${var.message}"
+
+  query = <<EOF
+    avg(last_5m): (
+      avg:azure.cache_redis.evictedkeys{${data.template_file.filter.rendered}} by {name,resource_group}
+     ) > ${var.evictedkeys_limit_threshold_critical}
+EOF
+
+  type = "metric alert"
+
+  thresholds {
+    warning  = "${var.evictedkeys_limit_threshold_warning}"
+    critical = "${var.evictedkeys_limit_threshold_critical}"
+  }
+
+  notify_no_data      = false
+  evaluation_delay    = "${var.delay}"
+  renotify_interval   = 0
+  notify_audit        = false
+  timeout_h           = 0
+  include_tags        = true
+  locked              = false
+  require_full_window = true
+  new_host_delay      = "${var.delay}"
+  no_data_timeframe   = 20
+
+  tags = ["env:${var.environment}", "resource:redis", "team:azure", "provider:azure"]
+}
+
+resource "datadog_monitor" "percent_processor_time" {
+  name    = "[${var.environment}] Redis processor time {{value}}% on {{name}}"
+  message = "${var.message}"
+
+  query = <<EOF
+    avg(last_5m): (
+      avg:azure.cache_redis.percent_processor_time{${data.template_file.filter.rendered}} by {name,resource_group}
+    ) > ${var.percent_processor_time_threshold_critical}
+EOF
+
+  type = "metric alert"
+
+  thresholds {
+    warning  = "${var.percent_processor_time_threshold_warning}"
+    critical = "${var.percent_processor_time_threshold_critical}"
+  }
+
+  notify_no_data      = false
+  evaluation_delay    = "${var.delay}"
+  renotify_interval   = 0
+  notify_audit        = false
+  timeout_h           = 0
+  include_tags        = true
+  locked              = false
+  require_full_window = true
+  new_host_delay      = "${var.delay}"
+  no_data_timeframe   = 20
+
+  tags = ["env:${var.environment}", "resource:redis", "team:azure", "provider:azure"]
+}
+
+resource "datadog_monitor" "server_load" {
+  name    = "[${var.environment}] Redis processor server load {{value}}% on {{name}}"
+  message = "${var.message}"
+
+  query = <<EOF
+    avg(last_5m): (
+      avg:azure.cache_redis.server_load{${data.template_file.filter.rendered}} by {name,resource_group}
+    ) > ${var.server_load_rate_threshold_critical}
+EOF
+
+  type = "metric alert"
+
+  thresholds {
+    warning  = "${var.server_load_rate_threshold_warning}"
+    critical = "${var.server_load_rate_threshold_critical}"
+  }
+
+  notify_no_data      = false
+  evaluation_delay    = "${var.delay}"
+  renotify_interval   = 0
+  notify_audit        = false
+  timeout_h           = 0
+  include_tags        = true
+  locked              = false
+  require_full_window = true
+  new_host_delay      = "${var.delay}"
+  no_data_timeframe   = 20
+
+  tags = ["env:${var.environment}", "resource:redis", "team:azure", "provider:azure"]
+}