@matteo That's basically the "labels" feature. You can target scheduled and live queries to subsets of hosts using labels.

sure, but afaik labels need at least a query that returns the same value for the same host-group, In my case, where there is no naming convention, we would like to have a static, local way to group the different fleets, without involving any queries. Else, a query that returns and save a custom value we can insert in the query in advance. Hints? Or should I just file a request on Github? thanks for the help!