d4ce91749d
These are useful stats to debug vector related line deteriorations,
see [0].
Example output:
"erb": {
"sent": 169925,
"discarded": 0
}
[0] https://forum.openwrt.org/t/vectoring-on-lantiq-vrx200-vr9-missing-callback-for-sending-error-samples/104046
Signed-off-by: Andre Heider <a.heider@gmail.com>