[rules-users] KnowledgeAgent, when to stop notifier/scanner services?

Hy all I have seen a few references warning that the change notifier and change scanner services must be stopped or a memory leak can occur, but where would I stop them? The knowledge base needs to "live on" and be updated as new knowledge sessions are created from it. So the only place I would be stopping these services and disposing of the knowledge agent, would be when the server is restarted. Is this incorrect? If so, *when* would be an appropriate time to stop these services? Thanks for your help. Kind regards, Peter