官网介绍
$request_time – Full request time, starting when NGINX reads the first byte from the client and ending when NGINX sends the last byte of the response body
$upstream_connect_time – Time spent establishing a connection with an upstream server
$upstream_header_time – Time between establishing a connection to an upstream server and receiving the first byte of the response header
$upstream_response_time – Time between establishing a connection to an upstream server and receiving the last byte of the response body
$upstream_connect_time 是建立连接的时间
$upstream_header_time 从建立连接到发送第一个响应头字节的时间
$request_times 是从请求到建立连接到发送完最后一个内容字节的时间
$upstream_response_time 是从建立连接到发送完最后一个内容字节的时间,这个是我们需要关注的,因为客户端的请求和客户所在网络有关
使用下面这个日志格式,看的参数比较全
log_format apm ‘[$time_local]\tclient=$remote_addr\t‘
‘request="$request"\t request_length=$request_length\t‘
‘http_referer="$http_referer"\t‘
‘bytes_sent=$bytes_sent\t‘
‘body_bytes_sent=$body_bytes_sent\t‘
‘user_agent="$http_user_agent"\t‘
‘upstream_addr=$upstream_addr\t‘
‘upstream_status=$upstream_status\t‘
‘cookie="$http_cookie"\t‘
‘request_body="$request_body"\t‘
‘document_root="$document_root"\t‘
‘fastcgi_script_name="$fastcgi_script_name"\t‘
‘request_filename="$request_filename"\t‘
‘request_time=$request_time\t‘
‘upstream_response_time=$upstream_response_time\t‘
‘upstream_connect_time=$upstream_connect_time\t‘
‘upstream_header_time=$upstream_header_time\t‘;
[03/Dec/2019:19:18:43 +0800] client=10.222.128.170 request="POST /wa.php?a=list_folder&calltype=auto HTTP/1.1" request_length=959 http_referer="http://webmail.sina.net/classic/index.php" bytes_sent=630 body_bytes_sent=84 user_agent="Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36" upstream_addr=127.0.0.1:9000 upstream_status=200 cookie="language=cn; __guid=253826190.3237372183145944600.1575355793588.1697; _ga=GA1.2.1940556535 mon=0; monitor_count=7" request_body="sactioncount=" document_root="/usr/local/sinamail/web" fastcgi_script_name="/wa.php" request_filename="/usr/local/sinamail/web/wa.php" request_time=0.133 upstream_response_time=0.133 upstream_connect_time=0.000 upstream_header_time=0.133
原文地址：https://www.cnblogs.com/taoshihan/p/11978842.html