想统计下 API 哪个请求处理事件长， Nginx 访问日志配置请求处理时间， request_time, 即可做到
官方文档对 request_time 介绍如下：
$request_time request processing time in seconds with a milliseconds resolution; time elapsed between the first bytes were read from the client and the log write after the last bytes were sent to the client
所以在日志格式化配置添加 request_time , access_log 后添加 format main 名称， 代码示例如下：
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for" "$request_time"';
server {
server_name test.com;
root html;
index index.html;
access_log logs/access.log main;
}
重启请求查看日志, 日志末尾的 “0.034” 即为请求入理时间
::1 - - [31/Oct/2015:10:33:06 +0800]
"GET /v2.0/assets/fontawesome-webfont-bundle.woff2 HTTP/1.1" 200 64464
"http://localhost/v2.0/app-bundle.css"
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_4)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.71 Safari/537.36"
"-" "0.034"
Source: