From c4841850d86c84c994f8c8a243fd21d3cada2227 Mon Sep 17 00:00:00 2001
From: Ahmed Fourti <ahmed.fourti@fr.clara.net>
Date: Fri, 1 Dec 2017 17:43:40 +0100
Subject: [PATCH] MON-92 Added MongoDB Monitor

---
 databases/mongodb/README.md         | 48 +++++++++++++++++++++++++++++
 databases/mongodb/inputs.tf         |  1 +
 databases/mongodb/monitors-mongo.tf | 34 ++++++++++++++++++++
 inputs.tf                           | 19 +++++++++++-
 4 files changed, 101 insertions(+), 1 deletion(-)
 create mode 100644 databases/mongodb/README.md
 create mode 120000 databases/mongodb/inputs.tf
 create mode 100644 databases/mongodb/monitors-mongo.tf

diff --git a/databases/mongodb/README.md b/databases/mongodb/README.md
new file mode 100644
index 0000000..8407e2a
--- /dev/null
+++ b/databases/mongodb/README.md
@@ -0,0 +1,48 @@
+###MongoDB Monitors
+
+Link to integration documentation :
+
+``https://docs.datadoghq.com/integrations/mongo/``
+
+**Prepare your ReplicaSet** :
+
+Add a user to your ReplicaSet (on the primary instance)
+
+
+```
+use admin  
+db.auth("admin", "admin-password") ## This is optional is you don't have any admin password  
+db.createUser({"user":"datadog", "pwd": "{{PASSWORD}}", "roles" : [ {role: 'read', db: 'admin' }, {role: 'clusterMonitor', db: 'admin'}, {role: 'read', db: 'local' }]})
+```
+
+**Configure your Datadog agent**
+
+Add this file conf.d/mongo.yaml
+
+```
+
+init_config:
+
+instances:
+      -   server: mongodb://datadog:password@[MONGO_URI]
+          tags:
+              - mytag1
+              - mytag2
+      -   server: mongodb://datadog:password@[MONGO_URI]
+          tags:
+              - mytag1
+              - mytag2
+```
+
+**Monitor ReplicaSet Health**
+
+Name: [environment] Replica Set heath for {{ replset_name }}
+
+This monitor will check the health of your ReplicaSet
+
+Metrics are :
+
+1: The replicaSet is OK  
+0: The replicaSet is KO  
+
+This monitor will trigger an alert for each ReplicaSet.
diff --git a/databases/mongodb/inputs.tf b/databases/mongodb/inputs.tf
new file mode 120000
index 0000000..cdfc6c6
--- /dev/null
+++ b/databases/mongodb/inputs.tf
@@ -0,0 +1 @@
+../../inputs.tf
\ No newline at end of file
diff --git a/databases/mongodb/monitors-mongo.tf b/databases/mongodb/monitors-mongo.tf
new file mode 100644
index 0000000..7a0fdc9
--- /dev/null
+++ b/databases/mongodb/monitors-mongo.tf
@@ -0,0 +1,34 @@
+module "message" {
+  source              = "../../common/alerting-message"
+  oncall_24x7         = "${var.hno_escalation_group}"
+  oncall_office_hours = "${var.ho_escalation_group}"
+}
+
+resource "datadog_monitor" "Mongodb_ReplicaSet_State" {
+  name    = "[${var.env}] Replica Set heath for {{ replset_name }}"
+  message = "${module.message.alerting-message}"
+
+  query = <<EOF
+      avg(last_5m): (
+        avg:mongodb.replset.health{dd_monitoring:enabled,dd_monitoring_mongodb,env:${var.env}} by {replset_name}
+      ) == ${var.mongo_config["critical"]}
+  EOF
+
+  type = "query alert"
+
+  thresholds {
+    ok       = "${var.mongo_config["ok"]}"
+    critical = "${var.mongo_config["critical"]}"
+  }
+
+  notify_no_data      = true
+  renotify_interval   = 15
+  evaluation_delay    = "${var.mongo_config["delay"]}"
+  notify_audit        = false
+  timeout_h           = 0
+  include_tags        = true
+  locked              = false
+  require_full_window = true
+
+  tags = ["env:${var.env}", "type:mongodb"]
+}
diff --git a/inputs.tf b/inputs.tf
index 7fd4b4b..413a6f4 100644
--- a/inputs.tf
+++ b/inputs.tf
@@ -60,6 +60,8 @@ variable "rds_cpu_threshold" {
 }
 
 variable "rds_mem_threshold" {
+  type = "map"
+
   default = {
     warning  = 20
     critical = 10
@@ -81,6 +83,8 @@ variable "elb_config" {
 }
 
 variable "elb_5xx_threshold" {
+  type = "map"
+
   default = {
     warning  = 5
     critical = 10
@@ -88,6 +92,8 @@ variable "elb_5xx_threshold" {
 }
 
 variable "elb_4xx_threshold" {
+  type = "map"
+
   default = {
     warning  = 5
     critical = 10
@@ -96,7 +102,6 @@ variable "elb_4xx_threshold" {
 
 variable "elb_backend_latency" {
   description = "Average time elapsed after the request leaves the load balancer until a response is received. In seconds"
-
   default = {
     warning  = 1
     critical = 5
@@ -133,3 +138,15 @@ variable "php_fpm_busy_threshold" {
     critical = 0.9
   }
 }
+
+##MongoDB
+variable "mongo_config" {
+  description = "Critical means the ReplicaSet is DOWN and OK means the ReplicaSet is UP"
+  type = "map"
+
+  default = {
+    delay          = 0
+    critical       = 0
+    ok             = 1
+  }
+}