The default configuration uses a custom logging format to add additional information about upstreams, response time and status
log_format upstreaminfo '{{ if $cfg.useProxyProtocol }}$proxy_protocol_addr{{ else }}$remote_addr{{ end }} - '
'[$the_real_ip] - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent" '
'$request_length $request_time [$proxy_upstream_name] $upstream_addr $upstream_response_length $upstream_response_time $upstream_status';
Sources:
Description:
$proxy_protocol_addr: if PROXY protocol is enabled$remote_addr: if PROXY protocol is disabled (default)$the_real_ip: the source IP address of the client$remote_user: user name supplied with the Basic authentication$time_local: local time in the Common Log Format$request: full original request line$status: response status$body_bytes_sent: number of bytes sent to a client, not counting the response header$http_referer: value of the Referer header$http_user_agent: value of User-Agent header$request_length: request length (including request line, header, and request body)$request_time: time elapsed since the first bytes were read from the client$proxy_upstream_name: name of the upstream. The format isupstream-<namespace>-<service name>-<service port>$upstream_addr: keeps the IP address and port, or the path to the UNIX-domain socket of the upstream server. If several servers were contacted during request processing, their addresses are separated by commas$upstream_response_length: keeps the length of the response obtained from the upstream server$upstream_response_time: keeps time spent on receiving the response from the upstream server; the time is kept in seconds with millisecond resolution$upstream_status: keeps status code of the response obtained from the upstream server