diff --git a/doc/notification_samples/aggregate-update_metadata-end.json b/doc/notification_samples/aggregate-update_metadata-end.json
new file mode 100644
index 000000000..1bcb0a8e9
--- /dev/null
+++ b/doc/notification_samples/aggregate-update_metadata-end.json
@@ -0,0 +1,13 @@
+{
+    "priority": "INFO",
+    "payload": {
+        "$ref": "common_payloads/AggregatePayload.json#",
+        "nova_object.data": {
+            "metadata": {
+                "availability_zone": "AZ-1"
+            }
+        }
+    },
+    "event_type": "aggregate.update_metadata.end",
+    "publisher_id": "nova-api:fake-mini"
+}
diff --git a/doc/notification_samples/aggregate-update_metadata-start.json b/doc/notification_samples/aggregate-update_metadata-start.json
new file mode 100644
index 000000000..68bd9e507
--- /dev/null
+++ b/doc/notification_samples/aggregate-update_metadata-start.json
@@ -0,0 +1,8 @@
+{
+    "priority": "INFO",
+    "payload": {
+        "$ref": "common_payloads/AggregatePayload.json#"
+    },
+    "event_type": "aggregate.update_metadata.start",
+    "publisher_id": "nova-api:fake-mini"
+}
diff --git a/nova/notifications/objects/aggregate.py b/nova/notifications/objects/aggregate.py
index 3efa292ec..8698ee890 100644
--- a/nova/notifications/objects/aggregate.py
+++ b/nova/notifications/objects/aggregate.py
@@ -50,6 +50,8 @@ class AggregatePayload(base.NotificationPayloadBase):
 @base.notification_sample('aggregate-add_host-end.json')
 @base.notification_sample('aggregate-remove_host-start.json')
 @base.notification_sample('aggregate-remove_host-end.json')
+@base.notification_sample('aggregate-update_metadata-start.json')
+@base.notification_sample('aggregate-update_metadata-end.json')
 @nova_base.NovaObjectRegistry.register_notification
 class AggregateNotification(base.NotificationBase):
     # Version 1.0: Initial version
diff --git a/nova/objects/aggregate.py b/nova/objects/aggregate.py
index dfe3f890e..0f6ca130a 100644
--- a/nova/objects/aggregate.py
+++ b/nova/objects/aggregate.py
@@ -347,6 +347,11 @@ class Aggregate(base.NovaPersistentObject, base.NovaObject):
         compute_utils.notify_about_aggregate_update(self._context,
                                                     "updatemetadata.start",
                                                     payload)
+        compute_utils.notify_about_aggregate_action(
+            context=self._context,
+            aggregate=self,
+            action=fields.NotificationAction.UPDATE_METADATA,
+            phase=fields.NotificationPhase.START)
         to_add = {}
         for key, value in updates.items():
             if value is None:
@@ -365,6 +370,11 @@ class Aggregate(base.NovaPersistentObject, base.NovaObject):
         compute_utils.notify_about_aggregate_update(self._context,
                                                     "updatemetadata.end",
                                                     payload)
+        compute_utils.notify_about_aggregate_action(
+            context=self._context,
+            aggregate=self,
+            action=fields.NotificationAction.UPDATE_METADATA,
+            phase=fields.NotificationPhase.END)
         self.obj_reset_changes(fields=['metadata'])
 
     @base.remotable
diff --git a/nova/tests/functional/notification_sample_tests/test_aggregate.py b/nova/tests/functional/notification_sample_tests/test_aggregate.py
index 61a4a2056..95cb8775c 100644
--- a/nova/tests/functional/notification_sample_tests/test_aggregate.py
+++ b/nova/tests/functional/notification_sample_tests/test_aggregate.py
@@ -105,3 +105,34 @@ class TestAggregateNotificationSample(
             actual=fake_notifier.VERSIONED_NOTIFICATIONS[3])
 
         self.admin_api.delete_aggregate(aggregate['id'])
+
+    def test_aggregate_update_metadata(self):
+        aggregate_req = {
+            "aggregate": {
+                "name": "my-aggregate",
+                "availability_zone": "nova"}}
+        aggregate = self.admin_api.post_aggregate(aggregate_req)
+
+        set_metadata_req = {
+            "set_metadata": {
+                "metadata": {
+                    "availability_zone": "AZ-1"
+                }
+            }
+        }
+        fake_notifier.reset()
+        self.admin_api.post_aggregate_action(aggregate['id'], set_metadata_req)
+
+        self.assertEqual(2, len(fake_notifier.VERSIONED_NOTIFICATIONS))
+        self._verify_notification(
+            'aggregate-update_metadata-start',
+            replacements={
+                'uuid': aggregate['uuid'],
+                'id': aggregate['id']},
+            actual=fake_notifier.VERSIONED_NOTIFICATIONS[0])
+        self._verify_notification(
+            'aggregate-update_metadata-end',
+            replacements={
+                'uuid': aggregate['uuid'],
+                'id': aggregate['id']},
+            actual=fake_notifier.VERSIONED_NOTIFICATIONS[1])
diff --git a/nova/tests/unit/objects/test_aggregate.py b/nova/tests/unit/objects/test_aggregate.py
index cf78d22b7..3544f8bd5 100644
--- a/nova/tests/unit/objects/test_aggregate.py
+++ b/nova/tests/unit/objects/test_aggregate.py
@@ -122,7 +122,13 @@ class _TestAggregateObject(object):
 
     @mock.patch('nova.objects.aggregate._metadata_delete_from_db')
     @mock.patch('nova.objects.aggregate._metadata_add_to_db')
-    def test_update_metadata_api(self, mock_api_metadata_add,
+    @mock.patch('nova.compute.utils.notify_about_aggregate_action')
+    @mock.patch('oslo_versionedobjects.base.VersionedObject.'
+                'obj_from_primitive')
+    def test_update_metadata_api(self,
+                                 mock_obj_from_primitive,
+                                 mock_notify,
+                                 mock_api_metadata_add,
                                  mock_api_metadata_delete):
         fake_notifier.NOTIFICATIONS = []
         agg = aggregate.Aggregate()
@@ -130,6 +136,8 @@ class _TestAggregateObject(object):
         agg.id = 123
         agg.metadata = {'foo': 'bar'}
         agg.obj_reset_changes()
+        mock_obj_from_primitive.return_value = agg
+
         agg.update_metadata({'todelete': None, 'toadd': 'myval'})
         self.assertEqual(2, len(fake_notifier.NOTIFICATIONS))
         msg = fake_notifier.NOTIFICATIONS[0]
@@ -138,6 +146,11 @@ class _TestAggregateObject(object):
                          msg.payload['meta_data'])
         msg = fake_notifier.NOTIFICATIONS[1]
         self.assertEqual('aggregate.updatemetadata.end', msg.event_type)
+        mock_notify.assert_has_calls([
+            mock.call(context=self.context, aggregate=agg,
+                      action='update_metadata', phase='start'),
+            mock.call(context=self.context, aggregate=agg,
+                      action='update_metadata', phase='end')])
         self.assertEqual({'todelete': None, 'toadd': 'myval'},
                          msg.payload['meta_data'])
         self.assertEqual({'foo': 'bar', 'toadd': 'myval'}, agg.metadata)