Docs: Deprecate Deploy boards and New IaC cluster

doc/user/infrastructure/clusters/connect/new_gke_cluster.md

@@ -4,7 +4,16 @@ group: Configure
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 ---
 
-# New GKE cluster through IaC
+# New GKE cluster through IaC (DEPRECATED)
+
+> [Deprecated](https://gitlab.com/groups/gitlab-org/configure/-/epics/8) in GitLab 14.5.
+
+WARNING:
+The process described on this page uses cluster certificates to connect the
+new cluster to GitLab, [deprecated](https://gitlab.com/groups/gitlab-org/configure/-/epics/8) in GitLab 14.5.
+You can still create a cluster and then connect it to GitLab through the [Agent](../index.md).
+[An issue exists](https://gitlab.com/gitlab-org/gitlab/-/issues/343660)
+to migrate this functionality to the [Agent](../index.md).
 
 Learn how to create a new cluster on Google Kubernetes Engine (GKE) through
 [Infrastructure as Code (IaC)](../../index.md).

doc/user/project/deploy_boards.md

@@ -5,7 +5,7 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 type: howto, reference
 ---
 
-# Deploy boards **(FREE)**
+# Deploy boards (DEPRECATED) **(FREE)**
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/1589) in [GitLab Premium](https://about.gitlab.com/pricing/) 9.0.
 > - [Moved](https://gitlab.com/gitlab-org/gitlab/-/issues/212320) to GitLab Free in 13.8.
@@ -15,6 +15,12 @@ type: howto, reference
 > - In GitLab 13.11 and earlier, environments in folders do not show deploy boards.
 >   This is [fixed](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/60525) in
 >   GitLab 13.12.
+> - [Deprecated](https://gitlab.com/groups/gitlab-org/configure/-/epics/8) in GitLab 14.5.
+
+WARNING:
+This feature was [deprecated](https://gitlab.com/groups/gitlab-org/configure/-/epics/8) in GitLab 14.5.
+[An epic exists](https://gitlab.com/groups/gitlab-org/-/epics/2493)
+to add this functionality to the [Agent](../index.md).
 
 GitLab deploy boards offer a consolidated view of the current health and
 status of each CI [environment](../../ci/environments/index.md) running on [Kubernetes](https://kubernetes.io), displaying the status