The number of transmitted packets in the current connection that contained data being retransmitted measured between when this request started and now. For HTTP/1, this is the number of retransmissions associated with this HTTP request. For multiplexed versions of HTTP (e.g., HTTP/2) the number cannot be accurately ascribed to any particular HTTP request. This metric primarily covers the response message data and therefore is most meaningful after that has been sent (e.g., in vcl_log). Bytes the HTTP stack has sent by the time this metric is read may not have been sent successfully to the client yet due to other system buffers and therefore more retransmissions are still possible after VCL is no longer executing.




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