Bytes Out on HAProxy stats page

I’m trying to figure out what the bytes out means on stats page.


I found mentions that that value == ‘bout’ and I found that bout refers to just frontend usage. My understanding is that it’s the bytes sent back to the client connecting to HAProxy so if I send nothing back to the client connecting to the HAProxy it would always be zero? Also, is this throughput or goodput? I would think that it would be non-zero just because if TCP acknowledgements?

I think this would be actual TCP payload only. Haproxy is not aware of how many times the OS has to retransmit packets due to packet loss or how much bytes are spent with handshaking or ACKing other packets.

The out direction, in both frontend and backends means towards the client.

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