The ServiceNow Discovery spoke allows you to configure horizontal discovery from a flow designer thereby providing the ability to drive several kinds of business logics via the no code approach. You could use it for use cases like triggering a discovery when a change is implemented or when an alert is remediated or when a software installation or uninstallation is completed or during orchestration activity involved with your infrastructure.
You could read the following article for further documentation on its usage:- https://community.servicenow.com/community?id=community_article&sys_id=21b9cf971b9bb010fc3233bc1d4bcb23
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