kots.io/installer-only docs (#2864)

* kots.io/installer-only docs

* Update licenses-install-types.mdx

---------

Co-authored-by: Paige Calvert <[email protected]>

Author: divolgin

docs/vendor/licenses-install-types.mdx

@@ -40,7 +40,7 @@ The following describes each installation type available, as well as the require
      <tr>
           <th>Existing Cluster (Helm CLI)</th>
           <td><p>The customer does not have access to the Replicated installers.</p><p>When the <strong>Helm CLI Air Gap Instructions (Helm CLI only)</strong> install option is also enabled, the Download Portal displays instructions on how to pull Helm installable images into a local repository. See <a href="#install-options">Understanding Additional Install Options</a> below.</p></td>
-          <td>The latest release promoted to the channel where the customer is assigned must contain only Helm charts and Replicated Custom Resources at the top level of the directory.</td>
+          <td>The latest release promoted to the channel where the customer is assigned must contain only Helm charts and Replicated Custom Resources. Any other Kubernetes resources must include the `kots.io/installer-only` annotation. See <a href="#installer-only-annotation">kots.io/installer-only Annotation</a> below.</td>
      </tr>
      <tr>
        <th>Existing Cluster (KOTS install)</th>
@@ -77,6 +77,20 @@ The following describes each installation type available, as well as the require
      </tr>
 </table>
 
+### `kots.io/installer-only` Annotation {#installer-only-annotation}
+
+The `kots.io/installer-only` annotation indicates that the Kubernetes resource is only used by the Replicated installers (Embedded Cluster, KOTS, or kURL). This annotation is required for releases that support the `Existing Cluster (Helm CLI)` install type and include resources other than Helm charts.
+
+Example:
+```yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: my-service
+  annotations:
+    kots.io/installer-only: "true"
+```
+
 ## Understanding Additional Install Options {#install-options}
 
 After enabling installation types in the **Available install types** field, you can also enable the following options in the **Additional install options** field: