Initial commit with README and module files

README.md

@@ -1,12 +1,112 @@
-# Terraform Datadog Application Dashboard
+# Terraform Datadog App Dashboard Module
 
-This Terraform module configures a dashboard for your Kubernetes application.
+## Overview
 
-How-to set it up to work with your application is described below
+This Terraform module creates a comprehensive Kubernetes/Docker application monitoring dashboard in Datadog with CPU and memory utilization metrics, health monitoring, and synthetic API testing.
 
-# Setup
+## Features
 
-First you need to copy the contents of the example directory to a directory 
+- **Kubernetes Resource Monitoring**: Visualizes pod and node resource utilization
+- **CPU & Memory Tracking**: Top 10 containers by CPU and memory usage
+- **Health Monitoring**: Pod health metric alerts
+- **Synthetic Testing**: HTTP API endpoint monitoring
+- **Read-Only Dashboard**: Prevents accidental modifications in the UI
 
-module "your_application_name"
-  source = git://
+## Resources Created
+
+- `datadog_dashboard`: Application monitoring dashboard with multiple widgets
+- `datadog_monitor`: Kubernetes Pod Health metric alert
+- `datadog_synthetics_test`: API HTTP health check
+
+## Dashboard Widgets
+
+1. **Kubernetes Pods Hostmap**: CPU utilization by Docker image
+2. **CPU Utilization Timeseries**: Top 10 containers ranked by CPU usage
+3. **Kubernetes Nodes Hostmap**: CPU utilization by host
+4. **Memory Utilization Timeseries**: Top 10 containers ranked by memory usage
+5. **Alert Graph**: Visualization from the pod health monitor
+
+## Requirements
+
+| Name | Version |
+|------|---------|
+| terraform | >= 0.12 |
+| datadog | >= 3.2.0 |
+
+## Usage
+
+```hcl
+module "app_dashboard" {
+  source = "./terraform-datadog-app-dashboard"
+
+  app_namespace = "production"
+  cfa_name      = "my-cfa"
+  app_name      = "my-application"
+  team_name     = "platform-team"
+  image_name    = "my-app"
+  region        = "eu-west-1"
+  stage         = "prd"
+  url           = "https://api.example.com/health"
+}
+```
+
+## Inputs
+
+| Name | Description | Type | Required |
+|------|-------------|------|----------|
+| `app_namespace` | Namespace that the application runs in | `string` | yes |
+| `cfa_name` | Name of the CFA | `string` | yes |
+| `app_name` | Name of the application | `string` | yes |
+| `team_name` | Name of the responsible team | `string` | yes |
+| `image_name` | Name of the Docker Image | `string` | yes |
+| `region` | AWS region where resources are located | `string` | yes |
+| `stage` | Stage to monitor (dev, tst, stg, prd) | `string` | yes |
+| `url` | URL for Datadog Synthetics to monitor | `string` | yes |
+
+## Outputs
+
+Currently, this module does not export any outputs.
+
+## Monitor Configuration
+
+### Pod Health Monitor
+
+- **Query**: `avg(last_5m):sum:docker.containers.running{image_name:{image_name}} by {docker_image}.rollup(avg, 60) <= 1`
+- **Type**: Metric alert
+- **Thresholds**:
+  - OK: 3 containers
+  - Warning: 2 containers
+  - Critical: 1 container
+- **No Data**: Alert after 10 minutes
+
+### Synthetic API Test
+
+- **Type**: HTTP API test
+- **Method**: GET
+- **Interval**: Every 15 minutes (900 seconds)
+- **Assertion**: HTTP status code is 200
+- **Locations**: AWS EU and US regions
+
+## Tagging Strategy
+
+All resources are tagged with:
+- `cfa:{cfa_name}`
+- `team:{team_name}`
+- `app:{app_name}`
+- `env:{stage}`
+- `type:kubernetes` or `type:synthetics`
+
+## Notes
+
+- The dashboard is set to read-only mode to prevent accidental modifications
+- Metrics are filtered by the `image_name` variable
+- Synthetic tests run from multiple AWS regions for geographic coverage
+- Pod health monitor uses a 1-minute rollup average
+
+## License
+
+Internal use only - Sanoma/WeBuildYourCloud
+
+## Authors
+
+Created and maintained by the Platform Engineering team.