I just did a very brief check, but it seems to me that there are occurences where the loglevel of information is set too low.

For example, I would expect a scheduled job always to announce its start and end to the INFO level, so that I will know later on that this job was actually running when something weird happens.

Check those files for example

/Users/pfragemann/conf-trunk/confluence/src/java/com/atlassian/confluence/mail/jobs/ClearOldMailErrors.java
/Users/pfragemann/conf-trunk/confluence/src/java/com/atlassian/confluence/mail/jobs/DailyReportJob.java
/Users/pfragemann/conf-trunk/confluence/src/java/com/atlassian/confluence/importexport/impl/BackupJob.java
/Users/pfragemann/conf-trunk/confluence/src/java/com/atlassian/confluence/mail/jobs/MailPollJob.java