GV$ALERT_TYPES definition in Oracle Database 11.2
GV$ALERT_TYPES
SELECT
t.inst_id, -- INST_ID NUMBER
rid_keltsd, -- REASON_ID NUMBER
typnam_keltosd, -- OBJECT_TYPE VARCHAR2(64)
decode( -- TYPE VARCHAR2(9)
typ_keltsd, 1, 'Stateful', 'Stateless'),
nam_keltgsd, -- GROUP_NAME VARCHAR2(64)
decode( -- SCOPE VARCHAR2(8)
scp_keltsd, 1, 'Database', 'Instance'),
mtn_keltsd, -- INTERNAL_METRIC_CATEGORY VARCHAR2(64)
mtc_keltsd -- INTERNAL_METRIC_NAME VARCHAR2(64)
FROM
x$keltsd t,
x$keltosd,
x$keltgsd
WHERE
grp_keltsd = id_keltgsd AND otyp_keltsd = typid_keltosd