Presentation Services can provide some very detailed logs, useful for troubleshooting, performance tracing, and general poking around. See here for details.
bi-init.sh in 12c, so need to set up the
sawserver with flag to list all log sources
/app/oracle/biee/bi/bifoundation/web/bin/sawserver -logsources > saw_logsources_12.2.1.txt
Full list: https://gist.github.com/rmoff/e3be9009da6130839c71181cb58509a0