Merged in MON-113-fix-aws-elasticsearch-monitor (pull request #62)

MON-113 fix error in es_cluster_status monitor's query and apply latest best practices

Approved-by: Guillaume Kérivel <guillaume.kerivel@fr.clara.net>
Approved-by: Quentin Manfroi <quentin.manfroi@yahoo.fr>
Approved-by: Alexandre Gaillet <alexandre.gaillet@fr.clara.net>

cloud/aws/elasticsearch/README.md

@@ -33,6 +33,7 @@ Inputs
 | cpu_silenced | Groups to mute for ES cluster cpu monitor | map | `<map>` | no |
 | cpu_threshold_critical | CPU usage in percent (critical threshold) | string | `90` | no |
 | cpu_threshold_warning | CPU usage in percent (warning threshold) | string | `80` | no |
+| delay | Delay in seconds for the metric evaluation | string | `600` | no |
 | diskspace_message | Custom message for ES cluster diskspace monitor | string | `` | no |
 | diskspace_silenced | Groups to mute for ES cluster diskspace monitor | map | `<map>` | no |
 | diskspace_threshold_critical | Disk free space in percent (critical threshold) | string | `10` | no |
@@ -41,7 +42,6 @@ Inputs
 | es_cluster_status_message | Custom message for ES cluster status monitor | string | `` | no |
 | es_cluster_status_silenced | Groups to mute for ES cluster status monitor | map | `<map>` | no |
 | es_cluster_volume_size | ElasticSearch Domain volume size (in GB) | string | - | yes |
-| evaluation_delay | Delay in seconds for the metric evaluation | string | `600` | 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 an alert is triggered | string | - | yes |

cloud/aws/elasticsearch/inputs.tf

@@ -5,7 +5,7 @@ variable "environment" {
 }
 
 # Global DataDog
-variable "evaluation_delay" {
+variable "delay" {
   description = "Delay in seconds for the metric evaluation"
   default     = 600
 }

cloud/aws/elasticsearch/monitors-elasticsearch.tf

@@ -7,34 +7,37 @@ data "template_file" "filter" {
 }
 
 ### Elasticsearch cluster status monitor ###
+/* Note about the query
+    - If aws.es.cluster_statusred is 1 --> query value (= 2.1) > 2 : critical
+    - If aws.es.cluster_statusyellow is 1 --> 1 < query value (=1.1) < 2 : warning
+    Workaround : in the query, we add "0.1" to the result and we use the comparator ">=". No alert was triggered without that. */
 resource "datadog_monitor" "es_cluster_status" {
   name    = "[${var.environment}] ElasticSearch cluster status is not green"
   message = "${coalesce(var.es_cluster_status_message, var.message)}"
 
-  type = "query alert"
+  type = "metric alert"
 
   query = <<EOF
   max(last_30m): (
     avg:aws.es.cluster_statusred{${data.template_file.filter.rendered}} by {region,name} * 2 +
-    avg:aws.es.cluster_statusyel{${data.template_file.filter.rendered}} by {region,name}
+    (avg:aws.es.cluster_statusyellow{${data.template_file.filter.rendered}} by {region,name} + 0.1)
-  ) > 2
+  ) >= 2
 EOF
 
   thresholds {
-    ok       = 0
     warning  = 1
     critical = 2
   }
 
   notify_no_data      = true
-  evaluation_delay    = "${var.evaluation_delay}"
+  evaluation_delay    = "${var.delay}"
   renotify_interval   = 0
   notify_audit        = false
   timeout_h           = 0
   include_tags        = true
   locked              = false
   require_full_window = false
-  new_host_delay      = "${var.evaluation_delay}"
+  new_host_delay      = "${var.delay}"
   no_data_timeframe   = 20
 
   silenced = "${var.es_cluster_status_silenced}"
@@ -47,7 +50,7 @@ resource "datadog_monitor" "es_free_space_low" {
   name    = "[${var.environment}] ElasticSearch cluster free storage space {{#is_alert}}{{comparator}} {{threshold}}% ({{value}}%){{/is_alert}}{{#is_warning}}{{comparator}} {{warn_threshold}}% ({{value}}%){{/is_warning}}"
   message = "${coalesce(var.diskspace_message, var.message)}"
 
-  type = "query alert"
+  type = "metric alert"
 
   query = <<EOF
   avg(last_15m): (
@@ -62,14 +65,14 @@ EOF
   }
 
   notify_no_data      = true
-  evaluation_delay    = "${var.evaluation_delay}"
+  evaluation_delay    = "${var.delay}"
   renotify_interval   = 0
   notify_audit        = false
   timeout_h           = 0
   include_tags        = true
   locked              = false
   require_full_window = false
-  new_host_delay      = "${var.evaluation_delay}"
+  new_host_delay      = "${var.delay}"
   no_data_timeframe   = 20
 
   silenced = "${var.diskspace_silenced}"
@@ -82,7 +85,7 @@ resource "datadog_monitor" "es_cpu_90_15min" {
   name    = "[${var.environment}] ElasticSearch cluster CPU high {{#is_alert}}{{comparator}} {{threshold}}% ({{value}}%){{/is_alert}}{{#is_warning}}{{comparator}} {{warn_threshold}}% ({{value}}%){{/is_warning}}"
   message = "${coalesce(var.cpu_message, var.message)}"
 
-  type = "query alert"
+  type = "metric alert"
 
   query = <<EOF
   avg(last_15m): (
@@ -96,14 +99,14 @@ EOF
   }
 
   notify_no_data      = true
-  evaluation_delay    = "${var.evaluation_delay}"
+  evaluation_delay    = "${var.delay}"
   renotify_interval   = 0
   notify_audit        = false
   timeout_h           = 0
   include_tags        = true
   locked              = false
   require_full_window = false
-  new_host_delay      = "${var.evaluation_delay}"
+  new_host_delay      = "${var.delay}"
   no_data_timeframe   = 20
 
   silenced = "${var.cpu_silenced}"