V$WAITCLASSMETRIC_HISTORY definition in Oracle Database 11.2
V$WAITCLASSMETRIC_HISTORY

SELECT
  begin_time,                              -- BEGIN_TIME DATE
  end_time,                                -- END_TIME DATE
  intsize_csec,                            -- INTSIZE_CSEC NUMBER
  wait_class#,                             -- WAIT_CLASS# NUMBER
  wait_class_id,                           -- WAIT_CLASS_ID NUMBER
  average_waiter_count,                    -- AVERAGE_WAITER_COUNT NUMBER
  dbtime_in_wait,                          -- DBTIME_IN_WAIT NUMBER
  time_waited,                             -- TIME_WAITED NUMBER
  wait_count,                              -- WAIT_COUNT NUMBER
  time_waited_fg,                          -- TIME_WAITED_FG NUMBER
  wait_count_fg                            -- WAIT_COUNT_FG NUMBER
FROM
  gv$waitclassmetric_history
WHERE
  inst_id = USERENV('INSTANCE')

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