Allow custom log group template input for fluent-bit (#253)

* Allow custom log group template input for fluent-bit

* terraform-docs: automated action

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: OlamideOl1

aws/platform/README.md

@@ -187,6 +187,7 @@ You can then use it to manually edit the aws-auth ConfigMap:
 | <a name="input_istio_ingress_values"></a> [istio\_ingress\_values](#input\_istio\_ingress\_values) | Overrides to pass to the Helm chart | `list(string)` | `[]` | no |
 | <a name="input_istiod_values"></a> [istiod\_values](#input\_istiod\_values) | Overrides to pass to the Helm chart | `list(string)` | `[]` | no |
 | <a name="input_k8s_namespace"></a> [k8s\_namespace](#input\_k8s\_namespace) | Kubernetes namespace in which resources should be created | `string` | `"flightdeck"` | no |
+| <a name="input_log_group_template_override"></a> [log\_group\_template\_override](#input\_log\_group\_template\_override) | Optional override for Fluent Bit log group template | `string` | `null` | no |
 | <a name="input_logs_prefix"></a> [logs\_prefix](#input\_logs\_prefix) | Prefix for CloudWatch log groups | `string` | `"/flightdeck"` | no |
 | <a name="input_logs_retention_in_days"></a> [logs\_retention\_in\_days](#input\_logs\_retention\_in\_days) | Number of days for which logs should be retained | `number` | `30` | no |
 | <a name="input_logs_skip_destroy"></a> [logs\_skip\_destroy](#input\_logs\_skip\_destroy) | Set to false to destroy the log group with the platform | `bool` | `true` | no |

aws/platform/main.tf

@@ -380,7 +380,7 @@ locals {
             auto_create_group true
             region ${data.aws_region.current.name}
             log_group_name ${module.cloudwatch_logs.log_group_name}
-            log_group_template ${var.logs_prefix}/$kubernetes['namespace_name']
+            log_group_template ${local.log_group_template_value}
             log_stream_prefix $${HOST_NAME}-
             log_stream_template $kubernetes['pod_name'].$kubernetes['container_name']
             log_retention_days ${var.logs_retention_in_days}
@@ -420,6 +420,11 @@ locals {
     })
   ]
 
+  log_group_template_value = coalesce(
+    var.log_group_template_override,
+    "${var.logs_prefix}/$kubernetes['namespace_name']"
+  )
+
   istio_ingress_values = [
     yamlencode({
       service = {

aws/platform/variables.tf

@@ -152,6 +152,12 @@ variable "k8s_namespace" {
   description = "Kubernetes namespace in which resources should be created"
 }
 
+variable "log_group_template_override" {
+  type        = string
+  default     = null
+  description = "Optional override for Fluent Bit log group template"
+}
+
 variable "logs_retention_in_days" {
   type        = number
   default     = 30