V$METRIC definition in Oracle Database 11.2
V$METRIC

SELECT
  begin_time,                              -- BEGIN_TIME DATE
  end_time,                                -- END_TIME DATE
  intsize_csec,                            -- INTSIZE_CSEC NUMBER
  group_id,                                -- GROUP_ID NUMBER
  entity_id,                               -- ENTITY_ID NUMBER
  entity_sequence,                         -- ENTITY_SEQUENCE NUMBER
  metric_id,                               -- METRIC_ID NUMBER
  metric_name,                             -- METRIC_NAME VARCHAR2(64)
  value,                                   -- VALUE NUMBER
  metric_unit                              -- METRIC_UNIT VARCHAR2(64)
FROM
  gv$metric
WHERE
  inst_id = USERENV('INSTANCE')

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