Update notes for multiple alert at same time

There seems to be no way to apply the same alert note on multiple alerts using the UI.  For example, if multiple interfaces are down for a device, we want to be able to set the same alert note in one go.  It's only possible to do so at the moment if the alerts are not ack'ed, but we need to be able to update the notes at a later stage even after they have been ack'ed.