Add annotation istio.io/rev (#2743)

* Add annotation istio.io/rev

Signed-off-by: Jacek Ewertowski <jewertow@redhat.com>

* Describe istio.io/rev in more detail

Signed-off-by: Jacek Ewertowski <jewertow@redhat.com>

---------

Signed-off-by: Jacek Ewertowski <jewertow@redhat.com>

Author: jewertow

annotation/annotations.gen.go

@@ -438,6 +438,16 @@ annotations:
     resources:
       - AuthorizationPolicy
 
+  - name: istio.io/rev
+    featureStatus: Alpha
+    description: Specifies a control plane revision to which a given proxy is connected.
+      This annotation is added automatically, not set by a user. In contrary to the label istio.io/rev,
+      it represents the actual revision, not the requested revision.
+    deprecated: false
+    hidden: false
+    resources:
+      - Pod
+
   - name: proxy.istio.io/overrides
     featureStatus: Alpha
     description: Used internally to indicate user-specified overrides in the proxy container of the pod during injection.