docs: added an upgrade guide for 1.7.0 (#2750)

docs/content/advanced/backend/upgrade-guides/1-7-0.md

@@ -0,0 +1,35 @@
+---
+description: 'Actions Required for v.1.7.0'
+---
+
+# v1.7.0
+
+Version `1.7.0` of Medusa introduces a breaking change in the [CustomerService](../../../references/services/classes/CustomerService.md).
+
+## Overview
+
+In this new version, the method [`retrieveByEmail` in the Customer Service](../../../references/services/classes/CustomerService.md#retrievebyemail) has been deprecated in favor of other methods. Read the actions required below to learn which methods to use instead.
+
+## Actions Required
+
+Instead of using `customerService.retrieveByEmail`, you should now use the methods `customerService.retrieveRegisteredByEmail` or `customerService.retrieveUnRegisteredByEmail`.
+
+The `customerService.retrieveRegisteredByEmail` method allows you to retrieve a registered customer by email:
+
+```tsx
+customerService.retrieveRegisteredByEmail("example@gmail.com");
+```
+
+On the other hand, the `retrieveUnregisteredByEmail` method allows to retrieve guest customers by email:
+
+```jsx
+customerService.retrieveUnRegisteredByEmail("example@gmail.com");
+```
+
+To retrieve a customer by email regardless of whether they are registered or not, you can use the `customerService.list` method instead:
+
+```tsx
+customerService.list({
+  email: "example@gmail.com"
+})
+```

www/docs/sidebars.js

@@ -194,6 +194,11 @@ module.exports = {
               id: "advanced/backend/upgrade-guides/1-6-1",
               label: "v1.6.1"
             },
+            {
+              type: "doc",
+              id: "advanced/backend/upgrade-guides/1-7-0",
+              label: "v1.7.0"
+            },
           ]
         },
         {