The metric family tree is build based on the inventory information published by SNMPcollector probe.
If you want to rebuild the inventory information, here is steps.
1. select cs_key from CM_COMPUTER_SYSTEM where name = '<Device Name>'
2. CTRL + P on discovery_server probe and select callback "remove_master_deviecs_by_cskeys"
3. Input cs_key and execute.
4. In SNMPcollector probe GUI, "Force Component Rediscovery" against the Device.