Add steps to re-run the account pipeline and integration tests

runbooks/source/node-group-changes.html.md.erb

@@ -1,7 +1,7 @@
 ---
 title: Handling Node Group and Instance Changes
 weight: 54
-last_reviewed_on: 2023-12-13
+last_reviewed_on: 2023-12-15
 review_in: 6 months
 ---
 
@@ -16,13 +16,17 @@ You may need to make a change to an EKS [cluster node group] or [instance type c
 To avoid bringing down all the nodes at once is to follow these steps:
 
 1. add a new node group with your [updated changes]
-1. lookup the old node group name (you can find this in the aws gui)
-1. once merged in you can drain the old node group using the command below:
-1. raise a new [pr deleting] the old node group
+2. re-run the [infrastructure-account/terraform-apply] pipeline to update the Modsecurity Audit logs cluster to map roles to both old and new node group IAM Role
+   This is to avoid losing modsec audit logs from the new node group
+3. lookup the old node group name (you can find this in the aws gui)
+4. once merged in you can drain the old node group using the command below:
 
-> cloud-platform pipeline cordon-and-drain --cluster-name <cluster_name> --node-group <old_node_group_name>
+    > cloud-platform pipeline cordon-and-drain --cluster-name <cluster_name> --node-group <old_node_group_name>
+    [script source] because this command runs remotely in concourse you can't use this command to drain default ng on the manager cluster.
+5. raise a new [pr deleting] the old node group
+6. re-run the [infrastructure-account/terraform-apply] pipeline to again to update the Modsecurity Audit logs cluster to map roles with only the new node group IAM Role
+7. run the integration tests to ensure the cluster is healthy
 
-[script source] because this command runs remotely in concourse you can't use this command to drain default ng on the manager cluster.
 
 ### Notes:
 
@@ -36,3 +40,4 @@ To avoid bringing down all the nodes at once is to follow these steps:
 [updated changes]: https://github.com/ministryofjustice/cloud-platform-infrastructure/pull/2657
 [cordons and drains nodes]: https://github.com/ministryofjustice/cloud-platform-terraform-concourse/blob/main/pipelines/manager/main/cordon-and-drain-nodes.yaml
 [script source]: https://github.com/ministryofjustice/cloud-platform-terraform-concourse/blob/7851f741e6c180ed868a97d51cec0cf1e109de8d/pipelines/manager/main/cordon-and-drain-nodes.yaml#L50
+[infrastructure-account/terraform-apply]: https://concourse.cloud-platform.service.justice.gov.uk/teams/main/pipelines/infrastructure-account/jobs/terraform-apply