# CLOUD AWS ALB DataDog monitors

## How to use this module

```
module "datadog-monitors-cloud-aws-alb" {
  source = "git::ssh://git@bitbucket.org/morea/terraform.feature.datadog.git//cloud/aws/alb?ref={revision}"

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

```

## Purpose

Creates DataDog monitors with the following checks:

- ALB no healthy instances
- ALB latency
- ALB HTTP code 5xx
- ALB HTTP code 4xx
- ALB target HTTP code 5xx
- ALB target HTTP code 4xx

## Inputs

| Name | Description | Type | Default | Required |
|------|-------------|:----:|:-----:|:-----:|
| alb_no_healthy_instances_message | Custom message for ALB no healthy instances monitor | string | `` | no |
| alb_no_healthy_instances_silenced | Groups to mute for ALB no healthy instances monitor | map | `<map>` | no |
| alb_no_healthy_instances_time_aggregator | Monitor aggregator for ALB no healthy instances [available values: min, max or avg] | string | `min` | no |
| alb_no_healthy_instances_timeframe | Monitor timeframe for ALB no healthy instances [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`] | string | `last_5m` | no |
| artificial_requests_count | Number of false requests used to mitigate false positive in case of low trafic | string | `5` | 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_use_defaults | Use default filter tags convention | string | `true` | no |
| httpcode_alb_4xx_message | Custom message for ALB httpcode 4xx monitor | string | `` | no |
| httpcode_alb_4xx_silenced | Groups to mute for ALB httpcode 4xx monitor | map | `<map>` | no |
| httpcode_alb_4xx_threshold_critical | loadbalancer 4xx critical threshold in percentage | string | `80` | no |
| httpcode_alb_4xx_threshold_warning | loadbalancer 4xx warning threshold in percentage | string | `60` | no |
| httpcode_alb_4xx_timeframe | Monitor timeframe for ALB httpcode 4xx [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`] | string | `last_5m` | no |
| httpcode_alb_5xx_message | Custom message for ALB httpcode 5xx monitor | string | `` | no |
| httpcode_alb_5xx_silenced | Groups to mute for ALB httpcode 5xx monitor | map | `<map>` | no |
| httpcode_alb_5xx_threshold_critical | loadbalancer 5xx critical threshold in percentage | string | `80` | no |
| httpcode_alb_5xx_threshold_warning | loadbalancer 5xx warning threshold in percentage | string | `60` | no |
| httpcode_alb_5xx_timeframe | Monitor timeframe for ALB httpcode 5xx [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`] | string | `last_5m` | no |
| httpcode_target_4xx_message | Custom message for ALB target httpcode 4xx monitor | string | `` | no |
| httpcode_target_4xx_silenced | Groups to mute for ALB target httpcode 4xx monitor | map | `<map>` | no |
| httpcode_target_4xx_threshold_critical | target 4xx critical threshold in percentage | string | `80` | no |
| httpcode_target_4xx_threshold_warning | target 4xx warning threshold in percentage | string | `60` | no |
| httpcode_target_4xx_timeframe | Monitor timeframe for ALB target httpcode 4xx [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`] | string | `last_5m` | no |
| httpcode_target_5xx_message | Custom message for ALB target httpcode 5xx monitor | string | `` | no |
| httpcode_target_5xx_silenced | Groups to mute for ALB target httpcode 5xx monitor | map | `<map>` | no |
| httpcode_target_5xx_threshold_critical | target 5xx critical threshold in percentage | string | `80` | no |
| httpcode_target_5xx_threshold_warning | target 5xx warning threshold in percentage | string | `60` | no |
| httpcode_target_5xx_timeframe | Monitor timeframe for ALB target httpcode 5xx [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`] | string | `last_5m` | no |
| latency_message | Custom message for ALB latency monitor | string | `` | no |
| latency_silenced | Groups to mute for ALB latency monitor | map | `<map>` | no |
| latency_threshold_critical | latency critical threshold in milliseconds | string | `1000` | no |
| latency_threshold_warning | latency warning threshold in milliseconds | string | `500` | no |
| latency_time_aggregator | Monitor aggregator for ALB latency [available values: min, max or avg] | string | `min` | no |
| latency_timeframe | Monitor timeframe for ALB latency [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`] | string | `last_5m` | no |
| message | Message sent when a monitor is triggered | string | - | yes |
| new_host_delay | Delay in seconds before monitor new resource | string | `300` | no |

## Outputs

| Name | Description |
|------|-------------|
| ALB_httpcode_4xx_id | id for monitor ALB_httpcode_4xx |
| ALB_httpcode_5xx_id | id for monitor ALB_httpcode_5xx |
| ALB_httpcode_target_4xx_id | id for monitor ALB_httpcode_target_4xx |
| ALB_httpcode_target_5xx_id | id for monitor ALB_httpcode_target_5xx |
| ALB_latency_id | id for monitor ALB_latency |
| ALB_no_healthy_instances_id | id for monitor ALB_no_healthy_instances |

## Related documentation

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

AWS ALB metrics documentation: [https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-cloudwatch-metrics.html](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-cloudwatch-metrics.html)