# CLOUD AWS ELB DataDog monitors

## How to use this module

```
module "datadog-monitors-cloud-aws-elb" {
  source = "git::ssh://git@git.fr.clara.net/claranet/pt-monitoring/projects/datadog/terraform/monitors.git//cloud/aws/elb?ref={revision}"

  environment = "${var.environment}"
  message     = "${module.datadog-message-alerting.alerting-message}"
}

```

## Purpose

Creates DataDog monitors with the following checks:

- ELB backend 5xx errors too high
- ELB healthy instances
- ELB 4xx errors too high
- ELB latency too high

## Inputs

| Name | Description | Type | Default | Required |
|------|-------------|:----:|:-----:|:-----:|
| artificial\_requests\_count | Number of false requests used to mitigate false positive in case of low trafic | string | `"5"` | no |
| elb\_4xx\_enabled | Flag to enable ELB 4xx errors monitor | string | `"true"` | no |
| elb\_4xx\_extra\_tags | Extra tags for ELB 4xx errors monitor | list(string) | `[]` | no |
| elb\_4xx\_message | Custom message for ELB 4xx errors monitor | string | `""` | no |
| elb\_4xx\_threshold\_critical | loadbalancer 4xx critical threshold in percentage | string | `"10"` | no |
| elb\_4xx\_threshold\_warning | loadbalancer 4xx warning threshold in percentage | string | `"5"` | no |
| elb\_4xx\_timeframe | Monitor timeframe for ELB 4xx errors [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`] | string | `"last_5m"` | no |
| elb\_5xx\_enabled | Flag to enable ELB 5xx errors monitor | string | `"true"` | no |
| elb\_5xx\_extra\_tags | Extra tags for ELB 5xx errors monitor | list(string) | `[]` | no |
| elb\_5xx\_message | Custom message for ELB 5xx errors monitor | string | `""` | no |
| elb\_5xx\_threshold\_critical | loadbalancer 5xx critical threshold in percentage | string | `"10"` | no |
| elb\_5xx\_threshold\_warning | loadbalancer 5xx warning threshold in percentage | string | `"5"` | no |
| elb\_5xx\_timeframe | Monitor timeframe for ELB 5xx errors [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`] | string | `"last_5m"` | no |
| elb\_backend\_4xx\_enabled | Flag to enable ELB backend 4xx errors monitor | string | `"true"` | no |
| elb\_backend\_4xx\_extra\_tags | Extra tags for ELB backend 4xx errors monitor | list(string) | `[]` | no |
| elb\_backend\_4xx\_message | Custom message for ELB backend 4xx errors monitor | string | `""` | no |
| elb\_backend\_4xx\_threshold\_critical | loadbalancer backend 4xx critical threshold in percentage | string | `"10"` | no |
| elb\_backend\_4xx\_threshold\_warning | loadbalancer backend 4xx warning threshold in percentage | string | `"5"` | no |
| elb\_backend\_4xx\_timeframe | Monitor timeframe for ELB backend 4xx errors [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`] | string | `"last_5m"` | no |
| elb\_backend\_5xx\_enabled | Flag to enable ELB backend 5xx errors monitor | string | `"true"` | no |
| elb\_backend\_5xx\_extra\_tags | Extra tags for ELB backend 5xx errors monitor | list(string) | `[]` | no |
| elb\_backend\_5xx\_message | Custom message for ELB backend 5xx errors monitor | string | `""` | no |
| elb\_backend\_5xx\_threshold\_critical | loadbalancer backend 5xx critical threshold in percentage | string | `"10"` | no |
| elb\_backend\_5xx\_threshold\_warning | loadbalancer backend 5xx warning threshold in percentage | string | `"5"` | no |
| elb\_backend\_5xx\_timeframe | Monitor timeframe for ELB backend 5xx errors [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`] | string | `"last_5m"` | no |
| elb\_backend\_latency\_critical | latency critical threshold in seconds | string | `"5"` | no |
| elb\_backend\_latency\_enabled | Flag to enable ELB backend latency monitor | string | `"true"` | no |
| elb\_backend\_latency\_extra\_tags | Extra tags for ELB backend latency monitor | list(string) | `[]` | no |
| elb\_backend\_latency\_message | Custom message for ELB backend latency monitor | string | `""` | no |
| elb\_backend\_latency\_time\_aggregator | Monitor aggregator for ELB backend latency [available values: min, max or avg] | string | `"min"` | no |
| elb\_backend\_latency\_timeframe | Monitor timeframe for ELB backend latency [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`] | string | `"last_5m"` | no |
| elb\_backend\_latency\_warning | latency warning threshold in seconds | string | `"1"` | no |
| elb\_no\_healthy\_instance\_enabled | Flag to enable ELB no healty instance monitor | string | `"true"` | no |
| elb\_no\_healthy\_instance\_extra\_tags | Extra tags for ELB no healty instance monitor | list(string) | `[]` | no |
| elb\_no\_healthy\_instance\_message | Custom message for ELB no healty instance monitor | string | `""` | no |
| elb\_no\_healthy\_instance\_time\_aggregator | Monitor aggregator for ELB no healty instance [available values: min or max] | string | `"min"` | no |
| elb\_no\_healthy\_instance\_timeframe | Monitor timeframe for ELB no healty instance [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`] | string | `"last_5m"` | no |
| environment | Architecture Environment | string | n/a | yes |
| evaluation\_delay | Delay in seconds for the metric evaluation | string | `"900"` | no |
| filter\_tags\_custom | Tags used for custom filtering when filter_tags_use_defaults is false | string | `"*"` | no |
| filter\_tags\_custom\_excluded | Tags excluded 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 | n/a | yes |
| new\_host\_delay | Delay in seconds before monitor new resource | string | `"300"` | no |
| prefix\_slug | Prefix string to prepend between brackets on every monitors names | string | `""` | no |

## Outputs

| Name | Description |
|------|-------------|
| ELB\_backend\_latency\_id | id for monitor ELB_backend_latency |
| ELB\_no\_healthy\_instances\_id | id for monitor ELB_no_healthy_instances |
| ELB\_too\_much\_4xx\_backend\_id | id for monitor ELB_too_much_4xx_backend |
| ELB\_too\_much\_4xx\_id | id for monitor ELB_too_much_4xx |
| ELB\_too\_much\_5xx\_backend\_id | id for monitor ELB_too_much_5xx_backend |
| ELB\_too\_much\_5xx\_id | id for monitor ELB_too_much_5xx |

## Related documentation

DataDog blog: [https://www.datadoghq.com/blog/monitor-application-load-balancer/](https://www.datadoghq.com/blog/monitor-application-load-balancer/)

AWS ELB metrics documentation: [https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-cloudwatch-metrics.html](https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-cloudwatch-metrics.html)