feat: Allow setting dimensions on CloudWatch Metric Filters (#57)

Author: LawrenceWarren

modules/log-metric-filter/README.md

@@ -30,7 +30,8 @@ No modules.
 |------|-------------|------|---------|:--------:|
 | <a name="input_create_cloudwatch_log_metric_filter"></a> [create\_cloudwatch\_log\_metric\_filter](#input\_create\_cloudwatch\_log\_metric\_filter) | Whether to create the Cloudwatch log metric filter | `bool` | `true` | no |
 | <a name="input_log_group_name"></a> [log\_group\_name](#input\_log\_group\_name) | The name of the log group to associate the metric filter with | `string` | n/a | yes |
-| <a name="input_metric_transformation_default_value"></a> [metric\_transformation\_default\_value](#input\_metric\_transformation\_default\_value) | The value to emit when a filter pattern does not match a log event. | `string` | `null` | no |
+| <a name="input_metric_transformation_default_value"></a> [metric\_transformation\_default\_value](#input\_metric\_transformation\_default\_value) | The value to emit when a filter pattern does not match a log event. Conflicts with `metric_transformation_dimensions`. | `string` | `null` | no |
+| <a name="input_metric_transformation_dimensions"></a> [metric\_transformation\_dimensions](#input\_metric\_transformation\_dimensions) | The additional dimensions to assign to the metric, in the form `"name" = "$.value". Conflicts with `metric\_transformation\_default\_value`.` | `map(string)` | `{}` | no |
 | <a name="input_metric_transformation_name"></a> [metric\_transformation\_name](#input\_metric\_transformation\_name) | The name of the CloudWatch metric to which the monitored log information should be published (e.g. ErrorCount) | `string` | n/a | yes |
 | <a name="input_metric_transformation_namespace"></a> [metric\_transformation\_namespace](#input\_metric\_transformation\_namespace) | The destination namespace of the CloudWatch metric. | `string` | n/a | yes |
 | <a name="input_metric_transformation_unit"></a> [metric\_transformation\_unit](#input\_metric\_transformation\_unit) | The unit to assign to the metric. If you omit this, the unit is set as None. | `string` | `null` | no |

modules/log-metric-filter/main.tf

@@ -11,5 +11,6 @@ resource "aws_cloudwatch_log_metric_filter" "this" {
     value         = var.metric_transformation_value
     default_value = var.metric_transformation_default_value
     unit          = var.metric_transformation_unit
+    dimensions    = var.metric_transformation_dimensions
   }
 }

modules/log-metric-filter/variables.tf

@@ -37,7 +37,7 @@ variable "metric_transformation_value" {
 }
 
 variable "metric_transformation_default_value" {
-  description = "The value to emit when a filter pattern does not match a log event."
+  description = "The value to emit when a filter pattern does not match a log event. Conflicts with `metric_transformation_dimensions`."
   type        = string
   default     = null
 }
@@ -47,3 +47,9 @@ variable "metric_transformation_unit" {
   type        = string
   default     = null
 }
+
+variable "metric_transformation_dimensions" {
+  description = "The additional dimensions to assign to the metric, in the form `\"name\" = \"$.value\". Conflicts with `metric_transformation_default_value`."
+  type        = map(string)
+  default     = {}
+}