Update common instructions

user-migration-samples/README.md

@@ -1,11 +1,13 @@
 # User Migration Samples
 
-This directory contains samples for migrating users from one identity provider to WSO2 Identity Server or Asgardeo.
+This directory contains samples for migrating users from an existing identity provider to WSO2 Identity Server or Asgardeo.
 
 ## Directory tree of Samples
 
 ```
 SAMPLES_HOME
+├── is
+    └── external-authentication-service
 ├── asgardeo
     └── external-authentication-service
 ```

user-migration-samples/asgardeo/external-authentication-service/README.md

@@ -10,6 +10,7 @@ This sample demonstrates how to implement an external authentication service in
 
 > [!NOTE]
 > - This guide provides a sample authentication service which satisfies only the basic functional requirement.
+> - In this example, authentication results are stored in an in-memory map and hence supports only single-replica deployments. This is not recommended for production use. You need to replace this with a high available implementation that suits your requirement (i.e. DB or cache service).
 
 > [!WARNING]
 > - We recommend adding necessary logs for audit purposes when developing the REST service. However be cautious on the information you log, especially DO NOT log any sensitive information including PII.

user-migration-samples/is/external-authentication-service/README.md

@@ -10,6 +10,7 @@ This sample demonstrates how to implement an external authentication service in
 
 > [!NOTE]
 > - This guide provides a sample authentication service which satisfies only the basic functional requirement.
+> - In this example, authentication results are stored in an in-memory map and hence supports only single-replica deployments. This is not recommended for production use. You need to replace this with a high available implementation that suits your requirement (i.e. DB or cache service).
 
 > [!WARNING]
 > - We recommend adding necessary logs for audit purposes when developing the REST service. However be cautious on the information you log, especially DO NOT log any sensitive information including PII.