Yuan Yao, An Oracle ACE's Blog

You can track whether AWR-related feature have been used by querying the DBA_FEATURE_USAGE_STATISTICS view:

SELECT name,
  detected_usages,
  currently_used,
  TO_CHAR(last_sample_date,'DD-MON-YYYY:HH24:MI') last_sample
FROM dba_feature_usage_statistics
WHERE name LIKE 'AWR %';

Sample output:

This output clearly shows which AWR features have been used and how often, aiding compliance audits.