Send backup notifiations when run ends with warning

site-cookbooks/backup/templates/default/config.rb.erb

@@ -81,7 +81,7 @@ preconfigure 'KosmosBackup' do
   encrypt_with OpenSSL
   notify_by Mail do |mail|
     mail.on_success = false
-    mail.on_warning = false
+    mail.on_warning = true
     mail.on_failure = true
   end
 end