[Geo node status] Expose updated_at through the API

ee/app/models/geo_node_status.rb

@@ -58,7 +58,7 @@ class GeoNodeStatus < ActiveRecord::Base
 
   def self.allowed_params
     excluded_params = %w(id created_at updated_at).freeze
-    extra_params = %w(success health health_status last_event_timestamp cursor_last_event_timestamp version revision storage_shards).freeze
+    extra_params = %w(success health health_status last_event_timestamp cursor_last_event_timestamp version revision storage_shards updated_at).freeze
     self.column_names - excluded_params + extra_params
   end
 

lib/api/entities.rb

@@ -1227,6 +1227,8 @@ module API
 
       expose :namespaces, using: NamespaceBasic
 
+      expose :updated_at
+
       # We load GeoNodeStatus data in two ways:
       #
       # 1. Directly by asking a Geo node via an API call