document how to perform and validate external -> embedded etcd migration

Signed-off-by: Paweł Bojanowski <[email protected]>

Author: hidalgopl

vcluster/configure/vcluster-yaml/control-plane/components/backing-store/etcd/deploy.mdx

@@ -81,13 +81,24 @@ controlPlane:
 
 There is an option to migrate from a deployed etcd to the [embedded](/vcluster/next/configure/vcluster-yaml/control-plane/components/backing-store/etcd/embedded) etcd option. Replace your current backing store with this option and upgrade your virtual cluster.
 
-```yaml
+```yaml title="vcluster.yaml"
+controlPlane:
+  backingStore:
+    etcd:
+      embedded:
+        enabled: true
+        migrateFromDeployedEtcd: true
+```
+
+Deploying with `migrateFromDeployedEtcd: true` keeps an external ETCD StatefulSet to perform a migration. After successful migration you should see `Successfully migrated etcd database to embedded etcd` log message in vCluster.
+To get rid of external ETCD after migration, remove `migrateFromDeployedEtcd: true` from `vcluster.yaml`:
+
+```yaml title="vcluster.yaml after ETCD migration"
 controlPlane:
   backingStore:
     etcd:
       embedded:
-        enabled: true 
-        migrateFromDeployedEtcd: true 
+        enabled: true
 ```
 
 ## Config reference

vcluster_versioned_docs/version-0.25.0/configure/vcluster-yaml/control-plane/components/backing-store/etcd/deploy.mdx

@@ -81,13 +81,24 @@ controlPlane:
 
 There is an option to migrate from a deployed etcd to the [embedded](/vcluster/next/configure/vcluster-yaml/control-plane/components/backing-store/etcd/embedded) etcd option. Replace your current backing store with this option and upgrade your virtual cluster.
 
-```yaml
+```yaml title="vcluster.yaml"
+controlPlane:
+  backingStore:
+    etcd:
+      embedded:
+        enabled: true
+        migrateFromDeployedEtcd: true
+```
+
+Deploying with `migrateFromDeployedEtcd: true` keeps an external ETCD StatefulSet to perform a migration. After successful migration you should see `Successfully migrated etcd database to embedded etcd` log message in vCluster.
+To get rid of external ETCD after migration, remove `migrateFromDeployedEtcd: true` from `vcluster.yaml`:
+
+```yaml title="vcluster.yaml after ETCD migration"
 controlPlane:
   backingStore:
     etcd:
       embedded:
-        enabled: true 
-        migrateFromDeployedEtcd: true 
+        enabled: true
 ```
 
 ## Config reference