# 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/cloudnative/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 4xx errors too high
- ELB 5xx errors too high
- ELB backend 4xx errors too high
- ELB backend 5xx errors too high
- ELB healthy instances
- 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 | `[]` | no |
| elb_4xx_message | Custom message for ELB 4xx errors monitor | string | `` | no |
| elb_4xx_silenced | Groups to mute for ELB 4xx errors monitor | map | `{}` | 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 | `[]` | no |
| elb_5xx_message | Custom message for ELB 5xx errors monitor | string | `` | no |
| elb_5xx_silenced | Groups to mute for ELB 5xx errors monitor | map | `{}` | 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 | `[]` | no |
| elb_backend_4xx_message | Custom message for ELB backend 4xx errors monitor | string | `` | no |
| elb_backend_4xx_silenced | Groups to mute for ELB backend 4xx errors monitor | map | `{}` | 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 | `[]` | no |
| elb_backend_5xx_message | Custom message for ELB backend 5xx errors monitor | string | `` | no |
| elb_backend_5xx_silenced | Groups to mute for ELB backend 5xx errors monitor | map | `{}` | 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 | `[]` | no |
| elb_backend_latency_message | Custom message for ELB backend latency monitor | string | `` | no |
| elb_backend_latency_silenced | Groups to mute for ELB backend latency monitor | map | `{}` | 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 | `[]` | no |
| elb_no_healthy_instance_message | Custom message for ELB no healty instance monitor | string | `` | no |
| elb_no_healthy_instance_silenced | Groups to mute for ELB no healty instance monitor | map | `{}` | 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 | - | 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 | - | yes |
| new_host_delay | Delay in seconds before monitor new resource | string | `300` | 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)