Alerting: Remove constraints for uniqueness of rule title (#102067)

* fix having duplicated names in same group in the UI

---------

Co-authored-by: Sonia Aguilar <soniaaguilarpeiron@gmail.com>

pkg/services/sqlstore/migrations/migrations.go

@@ -153,4 +153,6 @@ func (oss *OSSMigrations) AddMigration(mg *Migrator) {
 	ualert.AddAlertRuleMissingSeriesEvalsToResolve(mg)
 
 	accesscontrol.AddDatasourceDrilldownRemovalMigration(mg)
+
+	ualert.DropTitleUniqueIndexMigration(mg)
 }

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

@@ -195,6 +195,8 @@ func alertInstanceMigration(mg *migrator.Migrator) {
 	}))
 }
 
+var titleUniqueIndex = &migrator.Index{Cols: []string{"org_id", "namespace_uid", "title"}, Type: migrator.UniqueIndex}
+
 func addAlertRuleMigrations(mg *migrator.Migrator, defaultIntervalSeconds int64) {
 	// DO NOT EDIT
 	alertRule := migrator.Table{
@@ -245,9 +247,7 @@ func addAlertRuleMigrations(mg *migrator.Migrator, defaultIntervalSeconds int64)
 		Cols: []string{"org_id", "title"}, Type: migrator.UniqueIndex,
 	}))
 
-	mg.AddMigration("add index in alert_rule on org_id, namespase_uid and title columns", migrator.NewAddIndexMigration(alertRule, &migrator.Index{
-		Cols: []string{"org_id", "namespace_uid", "title"}, Type: migrator.UniqueIndex,
-	}))
+	mg.AddMigration("add index in alert_rule on org_id, namespase_uid and title columns", migrator.NewAddIndexMigration(alertRule, titleUniqueIndex))
 
 	mg.AddMigration("add dashboard_uid column to alert_rule", migrator.NewAddColumnMigration(
 		migrator.Table{Name: "alert_rule"},
@@ -571,3 +571,8 @@ func (c extractAlertmanagerConfigurationHistory) Exec(sess *xorm.Session, migrat
 	}
 	return nil
 }
+
+func DropTitleUniqueIndexMigration(mg *migrator.Migrator) {
+	mg.AddMigration("remove title in folder unique index",
+		migrator.NewDropIndexMigration(migrator.Table{Name: "alert_rule"}, titleUniqueIndex))
+}