Below are details of various Admin Logs on Control node:
Control Server Logs
Control Server Processing Logs are available in /var/a2/a2log_DDMMYYYY.out file on real time basis on the Control node.
Web Interface Logs are available in /var/log/messages i.e. syslog.
Every completed 'Cmd' App has logs available in /var/a2/APPNAME_DAYDDMONYYYYHHMM.out and /var/a2/APPNAME_DAYDDMONYYYYHHMM.err as output and error logs respectively.
A2 on GitHub
You may also wish to follow the GitHub project if you have a GitHub account. This is also where we keep the issue tracker for sharing bugs and feature ideas.