traffic statistics by network connection

[David H Durgee <dhdurgee verizon net>]

How can I get traffic statistics by network connection?  Is there a way 
to retrieve this using nmcli?  Is there another tool that will do so?

I have looked around and the tools I see work at the interface level, 
not at the connection level.

I am using nmcli 1.22.18 as distributed with linux mint 20.1 x64 here.

Dave

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