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# Compiled files
*.tfstate
*.tfstate.backup
.terraform.tfstate.lock.info
terraform.tfvars
# Module directory
.terraform/
jq

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# changelog
v0.1.17
- bugfix: `dashboard_b` should also use local.scope
v0.1.16
- Add support for template variables. Define `var.template_variable_{name,prefix,default}`
to filter across all graphs in the dashboard.
v0.1.15
- Allow user to specify a list of metrics to graph rather than querying them from datadog.
If you specify `metrics_list` directly, then it will use this list of metrics to generate
the dashboard instead of using the specified prefix to query it from datadog.
v0.1.14
- sort widgets
produce output that is ordered in a consistent manner to avoid idempotency issues
v0.1.13
- fix validation warnings
Warning: Interpolation-only expressions are deprecated
Warning: Quoted type constraints are deprecated
v0.1.12
- Introduced optional var.title for dashboard so it wouldn't have to be tied to var.prefix
- Parametrized `space_aggregation` and `scope` which are part of the query that defines
a particular timeseries graph. Previously `space_aggregation` was hardcoded to `avg`,
now you can choose from `avg, max, min, sum`
v0.1.11
- Fixed example
v0.1.10
- Moved logic to download jq, if needed, into `list_metrics.py` where it belongs
v0.1.8
- Added resource to download jq since terraform cloud does not have it
- Modified `list_metrics.py` to use locally "installed" jq
v0.1.7
- Minor fix
v0.1.6
- Refactored `list_metrics.py` to remove dependency on python3 and datadog python module

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# terraform module for autogenerating dashboards based on prefixed metrics
The Terraform Datadog provider does not offer a way to autodiscover metrics, however,
Datadog API can do this via [GET /v1/metrics](https://docs.datadoghq.com/api/?lang=python#get-list-of-active-metrics)
This terraform module uses an external data source [list_metrics.sh](https://github.com/borgified/terraform-datadog-dashboard/blob/master/list_metrics.sh) to fetch a list of
all available metrics filtered by a prefix so that this subset of metrics can be used as input to the [datadog_dashboard](https://www.terraform.io/docs/providers/datadog/r/dashboard.html)
resource.
For example, if you have these metrics in Datadog:
```
app.dev.memstats.alloc
app.dev.memstats.frees
app.dev.memstats.heap_released
...
```
then specify prefix = "app.dev.memstats" as your input to get a dashboard of all metrics
starting with that prefix.

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module "dashboard_a" {
source = "borgified/dashboard/datadog"
version = "0.1.17"
prefix = "aws.applicationelb"
api_key = "your datadog api key"
app_key = "your datadog app key"
space_aggregation = "sum"
scope = "*"
}
module "dashboard_b" {
source = "borgified/dashboard/datadog"
version = "0.1.17"
prefix = "aws.applicationelb"
api_key = "your datadog api key"
app_key = "your datadog app key"
metrics_list = "active_connection_count,client_tlsnegotiation_error_count"
space_aggregation = "sum"
scope = "*"
}

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output "url" {
description = "dashboard url"
value = module.dashboard.url
}

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data "external" "list_metrics" {
program = ["bash", "${path.module}/list_metrics.sh"]
query = {
api_key = var.api_key
app_key = var.app_key
prefix = var.prefix
}
}

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#!/usr/bin/env bash
# based on https://www.terraform.io/docs/providers/external/data_source.html#processing-json-in-shell-scripts
set -e
if ! [ -x "$(command -v jq)" ]; then
curl -sL https://github.com/stedolan/jq/releases/download/jq-1.6/jq-linux64 -o jq && chmod u+x jq
JQ="./jq"
else
JQ=$(command -v jq)
fi
eval "$($JQ -r '@sh "API_KEY=\(.api_key) APP_KEY=\(.app_key) PREFIX=\(.prefix)"')"
RESULT=$(curl -s -X GET \
-H "DD-API-KEY: ${API_KEY}" \
-H "DD-APPLICATION-KEY: ${APP_KEY}" \
-d "api_key=${API_KEY}" \
-d "application_key=${APP_KEY}" \
"https://api.datadoghq.com/api/v1/search?q=metrics:${PREFIX}" \
| $JQ -r --arg prefix "$PREFIX." '.results.metrics|sort|map(sub($prefix;""))|join(",")')
$JQ -n --arg result "$RESULT" '{"metrics":$result}'

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locals {
scope = format("%s,$%s", var.scope, var.template_variable_name)
}
resource "datadog_dashboard" "dashboard_a" {
count = var.metrics_list == "" ? 1 : 0
title = var.title
description = var.description
layout_type = "ordered"
dynamic "widget" {
for_each = sort(split(",", data.external.list_metrics.result.metrics))
content {
timeseries_definition {
title = widget.value
request {
q = "${var.space_aggregation}:${var.prefix}.${widget.value}{${local.scope}}"
metadata {
expression = "${var.space_aggregation}:${var.prefix}.${widget.value}{${local.scope}}"
alias_name = widget.value
}
}
}
}
}
template_variable {
name = var.template_variable_name
prefix = var.template_variable_prefix
default = var.template_variable_default
}
}
resource "datadog_dashboard" "dashboard_b" {
count = var.metrics_list != "" ? 1 : 0
title = var.title
description = var.description
layout_type = "ordered"
dynamic "widget" {
for_each = sort(split(",", var.metrics_list))
content {
timeseries_definition {
title = widget.value
request {
q = "${var.space_aggregation}:${var.prefix}.${widget.value}{${local.scope}}"
metadata {
expression = "${var.space_aggregation}:${var.prefix}.${widget.value}{${local.scope}}"
alias_name = widget.value
}
}
}
}
}
template_variable {
name = var.template_variable_name
prefix = var.template_variable_prefix
default = var.template_variable_default
}
}

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output "url" {
description = "visit this url to go to your new dashboard"
value = var.metrics_list == "" ? "https://app.datadoghq.com/dashboard/${datadog_dashboard.dashboard_a[0].id}" : "https://app.datadoghq.com/dashboard/${datadog_dashboard.dashboard_b[0].id}"
}
output "external_metrics" {
description = "queryable metrics from datadog discovered"
value = data.external.list_metrics.result.metrics
}

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provider "datadog" {
version = "~> 2.5"
api_key = var.api_key
app_key = var.app_key
}
provider "external" {
version = "~> 1.2"
}

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module "dashboard" {
source = "../"
prefix = var.prefix
api_key = var.api_key
app_key = var.app_key
space_aggregation = var.space_aggregation
scope = var.scope
}

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output "url" {
description = "dashboard url"
value = module.dashboard.url
}

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variable "title" {
description = "title of datadog dashboard"
type = "string"
default = "my dashboard"
}
variable "api_key" {
description = "datadog api key"
type = "string"
}
variable "app_key" {
description = "datadog app key"
type = "string"
}
variable "prefix" {
description = "metric prefix to pattern match against available metrics in datadog also used for dashboard title"
type = "string"
}
# https://docs.datadoghq.com/graphing/metrics/introduction/#breaking-down-the-metric-query
variable "space_aggregation" {
description = "choices: avg, max, min, sum"
type = "string"
}
variable "scope" {
description = "the set of tags used to choose time series for the query. eg. \"environment:production,service:myservice\""
type = "string"
}
variable "description" {
description = "datadog dashboard description"
type = "string"
default = "generated by Terraform"
}

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variable "title" {
description = "title of datadog dashboard"
type = string
default = "my dashboard"
}
variable "api_key" {
description = "datadog api key"
type = string
}
variable "app_key" {
description = "datadog app key"
type = string
}
variable "prefix" {
description = "metric prefix to pattern match against available metrics in datadog also used for dashboard title"
type = string
}
# https://docs.datadoghq.com/graphing/metrics/introduction/#breaking-down-the-metric-query
variable "space_aggregation" {
description = "choices: avg, max, min, sum"
type = string
}
variable "scope" {
description = "the set of tags used to choose time series for the query. eg. \"environment:production,service:myservice\""
type = string
}
variable "description" {
description = "datadog dashboard description"
type = string
default = "generated by Terraform"
}
variable "metrics_list" {
description = "list of metrics to provide if you dont want to use var.prefix to query them from datadog"
type = string
default = ""
}
variable "template_variable_name" {
description = "name of template variable"
type = string
default = "variable1"
}
variable "template_variable_prefix" {
description = "prefix of template variable"
type = string
default = ""
}
variable "template_variable_default" {
description = "default value for template variable"
type = string
default = "*"
}