Well, my database is already configured to run in archivelog mode:
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 15
Next log sequence to archive 17
Current log sequence 17
So, where is the problem? The action suggested by "Database Control" console is "Set the value of the LOG_ARCHIVE_START initialization parameter to TRUE". Hmmm, that is to set an obsolete parameter... no, thanks!
Update: Actually, I discovered that there are a lot of non-relevant/obsolete policies for 11g, like SGA_TARGET is not used, or PGA_AGGREGATE_TARGET should be used etc. It seems that many default settings from the "Database Control" do not take into consideration the actual version of the managed database therefore you have to manually suppress these policy/rule violations.