docs: import CloudNativePG main

Author: cnpg-bot

website/docs/labels_annotations.md

@@ -102,15 +102,21 @@ This label is available only on `VolumeSnapshot` resources.
   default users created by CloudNativePG (typically `postgres` and `app`).
 
 `role` - **deprecated**
-:  Whether the instance running in a pod is a `primary` or a `replica`.
-   This label is deprecated, you should use `cnpg.io/instanceRole` instead.
+:  Role of the instance running in a pod: `primary`, `replica`, or
+   `unhealthy`. The `unhealthy` value is transient: the operator sets
+   it on the old primary during a failover or switchover and clears it
+   automatically once the transition completes. This label is deprecated,
+   you should use `cnpg.io/instanceRole` instead.
 
 `cnpg.io/scheduled-backup`
 :  When available, name of the `ScheduledBackup` resource that created a given
    `Backup` object.
 
 `cnpg.io/instanceRole`
-: Whether the instance running in a pod is a `primary` or a `replica`.
+: Role of the instance running in a pod: `primary`, `replica`, or
+  `unhealthy`. The `unhealthy` value is transient: the operator sets
+  it on the old primary during a failover or switchover and clears it
+  automatically once the transition completes.
 
 `app.kubernetes.io/managed-by`
 : Name of the manager. It will always be `cloudnative-pg`.