Clear Oracle Enterprise Manager Alert

Clear alert on EM

1. Make a SELECT * from MGMT_CURRENT_SEVERITY and show for the TARGET_GUID, METRIC_GUID and KEY_VALUE.

2. Connect to db user SYSMAN and execute:
exec EM_SEVERITY.delete_current_severity(TARGET_GUID,METRIC_GUID,KEY_VALUE);

for example:
exec EM_SEVERITY.delete_current_severity('0DEB8E6980695B7548CF98871084AD10','F95BA0D95585002889E1ABF92B2DA7C3','SYS');

3. Wait a few minutes.