I needed to parse some logs and I wanted to know what Acquia’s Log file format was. Here it is:
LogFormat "%{X-AH-Client-IP}i %l %u %t \\"%r\\" %>s %b \\"%{Referer}i\\" <br/>
\\"%{User-agent}i\\" vhost=%v host=%{Host}i hosting_site=<siteid> pid=%P <br/> request_time=%D forwarded_for=\\"%{X-Forwarded-For}i\\" <br/> request_id=\\"%{X-Request-Id}i\\" "`
Here’s a link to the LogFormat reference.
Key tidbits:
request_time is in microseconds. Not milliseconds. So divide that sucker by 1,000,000.
Also, request_id will correlate requests across different log files (e.g. drupal-watchdog-<date> and/or drupal-requests-<date>.