We should mentioned in this part of the docs:
which queries are possible to select nodes or resources. Things like `nodeSysOID LIKE '.18.104.22.168.4.1.12356.%'` for example.
Afaik it should be identical with the filter rules in OpenNMS (poller or notification rules), shouldn't it?
This could be a good starting point: https://wiki.opennms.org/wiki/Filters
The filters are missing in general. Maybe we can refer from the HELM docs to the filter docs when they are migrated from the wiki.