doc how to use custom domain for sdk

Author: paigecalvert

docs/release-notes/rn-replicated-sdk.md

@@ -13,7 +13,7 @@ This topic contains release notes for the [Replicated SDK](/vendor/replicated-sd
 Released on Apr 16, 2025
 
 ### Improvements {#improvements-1-5-1}
-* Changed the default location of the image this chart uses to be registry.replicated.com/library/replicated-sdk-image. This is anonymous and will support custom domains.
+* Changes the default location of the image that the Replicated SDK chart uses to the Replicated registry at `registry.replicated.com/library/replicated-sdk-image`. This is anonymous and supports the use of custom domains. To use a custom domain for the SDK, add the custom domain for the Replicated registry in the Vendor Portal and then specify the domain in the `registry` value for the SDK. For more information about how to add and use custom domains, see [Use a Custom Domain for the Replicated SDK Image](/vendor/custom-domains-using#sdk).
 
 ## 1.5.0
 

docs/vendor/custom-domains-using.md

@@ -89,6 +89,28 @@ To configure Embedded Cluster to use your custom domains for the proxy registry
 
 1. Add the Embedded Cluster Config to a new release. Promote the release to a channel that your team uses for testing, and install with Embedded Cluster in a development environment to test your changes.
 
+### Use a Custom Domain for the Replicated SDK Image {#sdk}
+
+The default location for the image used by the Replicated SDK Helm chart is `registry.replicated.com/library/replicated-sdk-image`. To view the Replicated SDK image properties, see the SDK Helm chart [values.yaml](https://github.com/replicatedhq/replicated-sdk/blob/main/chart/values.yaml#L33) file in GitHub.
+
+To use a custom domain for the SDK image:
+
+1. Add a custom domain for the Replicated registry in the Vendor Portal. See [Add a Custom Domain in the Vendor Portal](#add-domain) above.
+
+1. In the Replicated SDK Helm chart [`values.yaml`](https://github.com/replicatedhq/replicated-sdk/blob/main/chart/values.yaml#L33), update the `image.registry` field with the custom domain that you added.
+
+     **Example:**
+
+     ```yaml
+     # SDK Helm chart values.yaml
+     image:
+       # update image.registry with your custom domain
+       registry: example.your-domain.com
+       repository: "library/replicated-sdk-image"
+       tag: "1.0.0"
+       pullPolicy: IfNotPresent   
+     ```
+
 ### Set a Default Domain
 
 Setting a default domain is useful for ensuring that the same domain is used across channels for all your customers.

docs/vendor/custom-domains.md

@@ -18,7 +18,7 @@ You can configure custom domains for the following services:
 
 - **Download Portal:** The Download Portal can be used to share customer license files, air gap bundles, and so on. By default, the Download Portal uses the domain `get.replicated.com`. Replicated recommends using a CNAME such as `portal.{your app name}.com` or `enterprise.{your app name}.com`. 
 
-- **Replicated registry:** Images and Helm charts can be pulled from the Replicated registry. By default, this registry uses the domain `registry.replicated.com`. Replicated recommends using a CNAME such as `registry.{your app name}.com`.
+- **Replicated registry:** Images and Helm charts can be pulled from the Replicated registry. Additionally, the default location for the image used by the Replicated SDK Helm chart is `registry.replicated.com/library/replicated-sdk-image`. By default, the Replicated registry uses the domain `registry.replicated.com`. Replicated recommends using a CNAME such as `registry.{your app name}.com`.
 
 ## Limitations