How to get the queue size in HA Proxy

I have below log from HA Proxy

Nov 17 09:15:41 lb1_server haproxy[14520]: [17/Nov/2017:09:15:40.191] lb in/batch31 0/0/0/1472/1473 503 5569 - - ---- 2106/2106/2098/79/0 0/0 "GET /my_url HTTP/1.1"

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Here I would like to understand what is


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and also using above log can I see how many requested were 'queued' as backend was not available ?
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David FavorLinux/LXD/WordPress/Hosting SavantCommented: provides HAProxy log format information.

You'll compare your config to the man page to determine exactly the meaning of each field.

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