The log info for ejabberd is extremely sparse. In order to get more verbose information in the log you have to enable debug at compile time. To do this just do make ejabberd_debug=true Reproducible: Always Steps to Reproduce:
Created attachment 116362 [details, diff] adds debug option to ebuild patch adds debug use flag and appends ejabberd_debug=true to make if enabled.
Your suggestion has been incorporated into the 1.1.3-r2 ebuild and you have been mentioned in the ChangeLog. Thank you.