Palo Alto VSYS
Virtual systems (VSYS) are separate, logical firewall instances within a single physical Palo Alto Networks firewall.
In Discovery each Palo Alto Virtual System is discovered as a Virtual Machine linked to the physical device.
Pattern triggers on Palo Alto NetworkDevice. It then checks if Virtual Systems (VSYS) are on the device by running SNMP query.
In case if there is no virtual systems pattern immediately stops. For each VSYS found Virtual Machine node created and linked to the physical device
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