Expose maintenance interval as a blueprint setting for node pools in GKE

modules/compute/gke-node-pool/README.md

@@ -273,6 +273,7 @@ No modules.
 | <a name="input_enable_gcfs"></a> [enable\_gcfs](#input\_enable\_gcfs) | Enable the Google Container Filesystem (GCFS). See [restrictions](https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/container_cluster#gcfs_config). | `bool` | `false` | no |
 | <a name="input_enable_secure_boot"></a> [enable\_secure\_boot](#input\_enable\_secure\_boot) | Enable secure boot for the nodes.  Keep enabled unless custom kernel modules need to be loaded. See [here](https://cloud.google.com/compute/shielded-vm/docs/shielded-vm#secure-boot) for more info. | `bool` | `true` | no |
 | <a name="input_guest_accelerator"></a> [guest\_accelerator](#input\_guest\_accelerator) | List of the type and count of accelerator cards attached to the instance. | <pre>list(object({<br>    type  = optional(string)<br>    count = optional(number, 0)<br>    gpu_driver_installation_config = optional(list(object({<br>      gpu_driver_version = string<br>    })))<br>    gpu_partition_size = optional(string)<br>    gpu_sharing_config = optional(list(object({<br>      gpu_sharing_strategy       = optional(string)<br>      max_shared_clients_per_gpu = optional(number)<br>    })))<br>  }))</pre> | `null` | no |
+| <a name="input_host_maintenance_interval"></a> [host\_maintenance\_interval](#input\_host\_maintenance\_interval) | Specifies the frequency of planned maintenance events. | `string` | `""` | no |
 | <a name="input_image_type"></a> [image\_type](#input\_image\_type) | The default image type used by NAP once a new node pool is being created. Use either COS\_CONTAINERD or UBUNTU\_CONTAINERD. | `string` | `"COS_CONTAINERD"` | no |
 | <a name="input_kubernetes_labels"></a> [kubernetes\_labels](#input\_kubernetes\_labels) | Kubernetes labels to be applied to each node in the node group. Key-value pairs. <br>(The `kubernetes.io/` and `k8s.io/` prefixes are reserved by Kubernetes Core components and cannot be specified) | `map(string)` | `null` | no |
 | <a name="input_labels"></a> [labels](#input\_labels) | GCE resource labels to be applied to resources. Key-value pairs. | `map(string)` | n/a | yes |

modules/compute/gke-node-pool/main.tf

@@ -162,6 +162,13 @@ resource "google_container_node_pool" "node_pool" {
       key                      = var.specific_reservation.key
       values                   = var.specific_reservation.values
     }
+
+    dynamic "host_maintenance_policy" {
+      for_each = true ? [1] : []
+      content {
+        maintenance_interval = var.host_maintenance_interval
+      }
+    }
   }
 
   network_config {

modules/compute/gke-node-pool/variables.tf

@@ -319,3 +319,14 @@ variable "specific_reservation" {
     values = null
   }
 }
+
+variable "host_maintenance_interval" {
+  description = "Specifies the frequency of planned maintenance events."
+  type        = string
+  default     = ""
+  nullable    = false
+  validation {
+    condition     = contains(["", "PERIODIC", "AS_NEEDED"], var.host_maintenance_interval)
+    error_message = "Invalid host_maintenance_interval value. Must be PERIODIC, AS_NEEDED or the empty string"
+  }
+}