I have interface Vlan2 with record ip route-cache flow, but I have never seen traffic of this interface, although, other VLAN interfaces present in statistics.

Probably, Vlan2 is not layer3 interface or you haven't enabled collection of layer2 statistics.

Try the command "show ip interface brief" to display brief summary of IP status and configuration. Probably Vlan2 has not assigned IP address or is in the down status. You can enable collection of layer2 statistics via the command: "ip flow ingress layer2-switched vlan 2 " where 2 is vlan id (you can also use list or range of vlans).