如何跟踪触发 php-fpm 执行某些操作的文件或进程？

Question

我有正在运行的服务器：

• NGINX 1.14.0
• PHP 7.1
• PHP-FPM

我正在尝试配置我的服务器，因为即使它们没有流量，它的运行速度也很慢。 在 php-fpm 错误日志中，我发现异常活动。 以下是日志的一部分。

...
[04-Feb-2021 07:53:15] WARNING: [pool www] child 22756 said into stderr: "--2021-02-04 07:53:15--  http://108.168.162.198/loft"
[04-Feb-2021 07:53:15] WARNING: [pool www] child 22756 said into stderr: "Connecting to 108.168.162.198:80... "
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "connected."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "HTTP request sent, awaiting response... "
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "200 OK"
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "Length: "
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "28995"
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: " (28K)"
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: ""
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "Saving to: 'STDOUT'"
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: ""
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "     0K"
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: " "
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: " "
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "."
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "....... ........                        100%  115K=0.2s"
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: ""
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: "2021-02-04 07:53:16 (115 KB/s) - written to stdout [28995/28995]"
[04-Feb-2021 07:53:16] WARNING: [pool www] child 22756 said into stderr: ""
[04-Feb-2021 07:53:17] WARNING: [pool www] child 22756 said into stderr: "sh: 1: fetch: not found"
[04-Feb-2021 07:53:17] WARNING: [pool www] child 22756 said into stderr: "Can't open perl script "loft": No such file or directory"
...

此操作正在使用我的 php-fpm 孩子，并将在某些时候终止。 我的假设是此操作导致我的 php-fpm 无法满足实际请求。

我的问题是，如何跟踪触发 php-fpm 执行某些操作的文件或进程？