Anamon currently captures /root/install.log from the installed system, it should also capture /root/install.log.syslog when it's present (RHEL <= 6). As I discovered in bug 1188539, that file is the output written by Anaconda's own internal syslog implementation(!) capturing non-kernel syslog messages which occurred during the installation.
More importantly, Anamon should also grab the contents of the systemd journal in the installation environment on RHEL >= 7. That has valuable messages which aren't available anywhere else, such as AVC denials triggered during the installation.
Beaker 26.4 has been released.