bug in pmseries: dynamically created network interfaces are missing from logged metrics instances

[DoubleBB]

step to reproduce:
$ pminfo -f network.interface.up
lists all existing network interfaces and their state

$ pmseries network.interface.up
$ pmseries -i .....

shows all network interfaces as instances

connecting by pmlc to the logger and quering the network.interface.up
shows all the netwrok interfaces as instances

now, create and activate a new network interface

$ pminfo network.interface.up
correctly lists all currently existing network interfaces including the new one.

$ pmseries network.interface.up
$ pmseries -i .....

shows the same instance list as before, missng the new network interface

connecting by pmlc to the logger and quering the network.interface.up
shows the new instance but with strange name as "???" (three question marks)

mand on 10 sec [66 or "???"]

But getting the http interface at /metric correctly includes the new network interface

expected behaviour: new interface should be listed by pmseries and should logged.

workround: after restarting the pmlogger service, the new network interface appear in the pmseries command output

tested pcp version: 6.3 and 6.2

comment: new network interfaces may appear frequently on virtual hosts when starting new virtual machines or assingning new interfces to running VMs.

I am not aware of any config option for pmseries to recognize new instances of metrics, so I think it is a bug