fix: Add default value for alert_manager_definition (#3)

README.md

@@ -81,7 +81,7 @@ No modules.
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
-| <a name="input_alert_manager_definition"></a> [alert\_manager\_definition](#input\_alert\_manager\_definition) | The alert manager definition that you want to be applied. See more in the [AWS Docs](https://docs.aws.amazon.com/prometheus/latest/userguide/AMP-alert-manager.html) | `string` | `null` | no |
+| <a name="input_alert_manager_definition"></a> [alert\_manager\_definition](#input\_alert\_manager\_definition) | The alert manager definition that you want to be applied. See more in the [AWS Docs](https://docs.aws.amazon.com/prometheus/latest/userguide/AMP-alert-manager.html) | `string` | `"alertmanager_config: |\nroute:\n  receiver: 'default'\nreceivers:\n  - name: 'default'\n"` | no |
 | <a name="input_create"></a> [create](#input\_create) | Determines whether a resources will be created | `bool` | `true` | no |
 | <a name="input_rule_group_namespaces"></a> [rule\_group\_namespaces](#input\_rule\_group\_namespaces) | A map of one or more rule group namespace definitions | `map(any)` | `{}` | no |
 | <a name="input_tags"></a> [tags](#input\_tags) | A map of tags to add to all resources | `map(string)` | `{}` | no |

variables.tf

@@ -27,7 +27,13 @@ variable "workspace_alias" {
 variable "alert_manager_definition" {
   description = "The alert manager definition that you want to be applied. See more in the [AWS Docs](https://docs.aws.amazon.com/prometheus/latest/userguide/AMP-alert-manager.html)"
   type        = string
-  default     = null
+  default     = <<-EOF
+	    alertmanager_config: |
+	    route:
+	      receiver: 'default'
+	    receivers:
+	      - name: 'default'
+  EOF
 }
 
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