Sometimes my Apache server get high load. I have a lot of VirtualHost, each one having its own log file.

The structure is like this /var/www/httpd-logs/virtualhost.com.access.log

What command could I use to find the website that got a high load in the past X minutes ?

I'll then analyze the corresponding website logs to find the issue.

for file in `ls -1 /var/www/httpd-logs/*.log` ; do
  echo "vhost $file"
  grep 2015:HOURHERE:MINUTESFIRSTDIGIT $file | wc -l

Slightly ghetto, but if you want a 10 minute period, say 2:50-2:59, then the grep line is grep 2015:14:5 $file | wc -l

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