unhide alert rule's data sources during migraiton (#48559)

pkg/services/sqlstore/migrations/ualert/alert_rule.go

@@ -160,6 +160,8 @@ func migrateAlertRuleQueries(data []alertQuery) ([]alertQuery, error) {
 		if err != nil {
 			return nil, err
 		}
+		// remove hidden tag from the query (if exists)
+		delete(fixedData, "hide")
 		fixedData = fixGraphiteReferencedSubQueries(fixedData)
 		updatedModel, err := json.Marshal(fixedData)
 		if err != nil {

pkg/services/sqlstore/migrations/ualert/alert_rule_test.go

@@ -25,6 +25,11 @@ func TestMigrateAlertRuleQueries(t *testing.T) {
 			input:    simplejson.NewFromAny(map[string]interface{}{"target": "ahalfquery"}),
 			expected: `{"target":"ahalfquery"}`,
 		},
+		{
+			name:     "when query was hidden, it removes the flag",
+			input:    simplejson.NewFromAny(map[string]interface{}{"hide": true}),
+			expected: `{}`,
+		},
 	}
 
 	for _, tt := range tc {