doc/internal/debug_tags.txt

   1 db.*            Database related
   2 db.query        SQL query trace
   3 db.conn         DB connections
   4 db.cpool        DB connection pool
   5
   6 housekeeper     Housekeeper messages
   7
   8 obj.*           Object related trace
   9 obj.dc.*        Data collection related
  10 obj.locks.*     Locks
  11
  12 threads.*       Thread related