Add note on id of grafana_local_admin account

Author: seunghun1ee

doc/source/operations/secret-rotation.rst

@@ -74,7 +74,7 @@ Full method
    the state of the cloud before any changes are made
 
 2. Edit your Kolla-Ansible checkout to include changes not yet included
-   upstream. 
+   upstream.
 
 .. _kolla-change:
 
@@ -98,7 +98,7 @@ Full method
       .. code:: bash
 
          git fetch https://review.opendev.org/openstack/kolla-ansible refs/changes/78/903178/2 && git cherry-pick FETCH_HEAD
-   
+
    3. Re-install Kolla-Ansible from source in your Kolla-Ansible Python
       environment
 
@@ -129,7 +129,7 @@ Full method
       ^redis_master_password
       ^memcache_secret_key
       _ssh_key
-         
+
          private_key
          public_key
       ^$
@@ -234,6 +234,28 @@ Full method
 
           grafana-cli admin reset-admin-password --password-from-stdin
 
+    .. note::
+
+      If you see an error ``Error: ✗ could not read user from database. Error: user not found``
+      from Grafana CLI, it means that the ID of ``grafana_local_admin``
+      is not 1 (The default value used with password reset command).
+      You can find the ID of ``grafana_local_admin`` by accessing MariaDB.
+
+      .. code:: sql
+
+         # Enter MariaDB with
+         docker exec -u 0 -it mariadb bash
+         mysql grafana -p
+         # Enter database password when prompted
+
+         SELECT id,login FROM user WHERE login = "grafana_local_admin";
+
+      Once you get the ID, run the password reset with user-id option
+
+      .. code:: bash
+
+         grafana-cli admin reset-admin-password --user-id <id> --password-from-stdin
+
 12. Update the MariaDB database password
 
     1. Generate a new secret: