Terraform module for Datadog Costs

This module will set up alerts to make sure you don't suddenly overspend on you datadog bill. It will also generate a costs dashboard

This module is part of a larger suite of modules that provide alerts in Datadog. Other modules can be found on the Terraform Registry

We have two base modules we use to standardise development of our Monitor Modules:

• generic monitor Used in 90% of our alerts
• service check monitor

Modules are generated with this tool: https://github.com/kabisa/datadog-terraform-generator

Example Usage

module "costs" {
  source = "kabisa/costs/datadog"

  notification_channel = "@mail@example.com"
  env                  = "prd"
  alert_env            = "prd"

  # Example config, please adjust
  filter_str                 = "*"
  apm_hosts_critical         = 2
  apm_spans_critical         = 1000000
  apm_spans_warning          = 800000
  containers_critical        = 375
  custom_metrics_critical    = 10000
  hosts_critical             = 20
  logs_indexed_critical      = 150000
  logs_ingestion_4h_critical = 208000000
  logs_ingestion_critical    = 850000000
  logs_ingestion_warning     = 600000000
}

Module Variables

Monitors:

Monitor name	Default enabled	Priority	Query
Apm Hosts	True	4	avg(last_1h):sum:datadog.estimated_usage.apm_hosts{tag:xxx} >
Apm Spans	True	3	sum(last_1h):sum:datadog.estimated_usage.apm.indexed_spans{tag:xxx}.as_count() >
Containers	True	4	avg(last_1h):sum:datadog.estimated_usage.containers{tag:xxx} >
Custom Metrics	True	4	avg(last_1h):sum:datadog.estimated_usage.metrics.custom{tag:xxx} >
Hosts	True	4	avg(last_1h):sum:datadog.estimated_usage.hosts{tag:xxx} >
Logs Indexed	True	3	sum(last_4h):sum:custom_datadog.estimated_usage.logs.ingested_events{tag:xxx}.as_count() >
Logs Ingestion 4h	True	3	sum(last_4h):sum:custom_datadog.estimated_usage.logs.ingested_bytes{tag:xxx}.as_count() >
Logs Ingestion	True	3	sum(last_1d):sum:custom_datadog.estimated_usage.logs.ingested_bytes{tag:xxx}.as_count() >

Getting started developing

pre-commit was used to do Terraform linting and validating.

Steps:

• Install pre-commit. E.g. brew install pre-commit.
• Run pre-commit install in this repo. (Every time you clone a repo with pre-commit enabled you will need to run the pre-commit install command)
• That’s it! Now every time you commit a code change (.tf file), the hooks in the hooks: config .pre-commit-config.yaml will execute.

Apm Hosts

Query:

avg(last_1h):sum:datadog.estimated_usage.apm_hosts{tag:xxx} > 

variable	default	required	description
apm_hosts_enabled	True	No
apm_hosts_warning	None	No
apm_hosts_critical		Yes
apm_hosts_evaluation_period	last_1h	No
apm_hosts_note	""	No
apm_hosts_docs	""	No
apm_hosts_filter_override	""	No
apm_hosts_alerting_enabled	True	No
apm_hosts_priority	4	No	Number from 1 (high) to 5 (low).

Apm Spans

Query:

sum(last_1h):sum:datadog.estimated_usage.apm.indexed_spans{tag:xxx}.as_count() > 

variable	default	required	description
apm_spans_enabled	True	No
apm_spans_warning		Yes
apm_spans_critical		Yes
apm_spans_evaluation_period	last_1h	No
apm_spans_note	""	No
apm_spans_docs	""	No
apm_spans_filter_override	""	No
apm_spans_alerting_enabled	True	No
apm_spans_priority	3	No	Number from 1 (high) to 5 (low).

Containers

Query:

avg(last_1h):sum:datadog.estimated_usage.containers{tag:xxx} > 

variable	default	required	description
containers_enabled	True	No
containers_warning	None	No
containers_critical		Yes
containers_evaluation_period	last_1h	No
containers_note	""	No
containers_docs	""	No
containers_filter_override	""	No
containers_alerting_enabled	True	No
containers_priority	4	No	Number from 1 (high) to 5 (low).

Custom Metrics

Query:

avg(last_1h):sum:datadog.estimated_usage.metrics.custom{tag:xxx} > 

variable	default	required	description
custom_metrics_enabled	True	No
custom_metrics_warning	None	No
custom_metrics_critical		Yes
custom_metrics_evaluation_period	last_1h	No
custom_metrics_note	""	No
custom_metrics_docs	""	No
custom_metrics_filter_override	""	No
custom_metrics_alerting_enabled	True	No
custom_metrics_priority	4	No	Number from 1 (high) to 5 (low).

Hosts

Query:

avg(last_1h):sum:datadog.estimated_usage.hosts{tag:xxx} > 

variable	default	required	description
hosts_enabled	True	No
hosts_warning	None	No
hosts_critical		Yes
hosts_evaluation_period	last_1h	No
hosts_note	""	No
hosts_docs	""	No
hosts_filter_override	""	No
hosts_alerting_enabled	True	No
hosts_priority	4	No	Number from 1 (high) to 5 (low).

Logs Indexed

Query:

sum(last_4h):sum:custom_datadog.estimated_usage.logs.ingested_events{tag:xxx}.as_count() > 

variable	default	required	description
logs_indexed_enabled	True	No
logs_indexed_warning	None	No
logs_indexed_critical		Yes
logs_indexed_evaluation_period	last_4h	No
logs_indexed_note	""	No
logs_indexed_docs	""	No
logs_indexed_filter_override	""	No
logs_indexed_alerting_enabled	True	No
logs_indexed_priority	3	No	Number from 1 (high) to 5 (low).

Logs Ingestion 4h

Query:

sum(last_4h):sum:custom_datadog.estimated_usage.logs.ingested_bytes{tag:xxx}.as_count() > 

variable	default	required	description
logs_ingestion_4h_enabled	True	No
logs_ingestion_4h_warning	None	No
logs_ingestion_4h_critical	None	No
logs_ingestion_4h_evaluation_period	last_4h	No
logs_ingestion_4h_note	""	No
logs_ingestion_4h_docs	""	No
logs_ingestion_4h_filter_override	""	No
logs_ingestion_4h_alerting_enabled	True	No
logs_ingestion_4h_priority	3	No	Number from 1 (high) to 5 (low).

Logs Ingestion

Query:

sum(last_1d):sum:custom_datadog.estimated_usage.logs.ingested_bytes{tag:xxx}.as_count() > 

variable	default	required	description
logs_ingestion_enabled	True	No
logs_ingestion_warning		Yes
logs_ingestion_critical		Yes
logs_ingestion_evaluation_period	last_1d	No
logs_ingestion_note	""	No
logs_ingestion_docs	""	No
logs_ingestion_filter_override	""	No
logs_ingestion_alerting_enabled	True	No
logs_ingestion_priority	3	No	Number from 1 (high) to 5 (low).

Module Variables

variable	default	required	description
env		Yes
service	Costs	No
notification_channel		Yes
additional_tags	[]	No
filter_str		Yes
costs_dashboard_name_override	""	No
locked	True	No