Alerting: Remove dead functionality from alert instance store (#55774)

* Update tests to use ListAlertInstances

* Drop the actual methods rather than just updating tests

pkg/services/ngalert/store/instance_database.go

@@ -2,46 +2,12 @@ package store
 
 import (
 	"context"
-	"fmt"
 	"strings"
 
 	"github.com/grafana/grafana/pkg/services/ngalert/models"
 	"github.com/grafana/grafana/pkg/services/sqlstore"
 )
 
-// GetAlertInstance is a handler for retrieving an alert instance based on OrgId, AlertDefintionID, and
-// the hash of the labels.
-func (st DBstore) GetAlertInstance(ctx context.Context, cmd *models.GetAlertInstanceQuery) error {
-	return st.SQLStore.WithDbSession(ctx, func(sess *sqlstore.DBSession) error {
-		instance := models.AlertInstance{}
-		s := strings.Builder{}
-		s.WriteString(`SELECT * FROM alert_instance
-			WHERE
-				rule_org_id=? AND
-				rule_uid=? AND
-				labels_hash=?
-		`)
-
-		_, hash, err := cmd.Labels.StringAndHash()
-		if err != nil {
-			return err
-		}
-
-		params := append(make([]interface{}, 0), cmd.RuleOrgID, cmd.RuleUID, hash)
-
-		has, err := sess.SQL(s.String(), params...).Get(&instance)
-		if !has {
-			return fmt.Errorf("instance not found for labels %v (hash: %v), alert rule %v (org %v)", cmd.Labels, hash, cmd.RuleUID, cmd.RuleOrgID)
-		}
-		if err != nil {
-			return err
-		}
-
-		cmd.Result = &instance
-		return nil
-	})
-}
-
 // ListAlertInstances is a handler for retrieving alert instances within specific organisation
 // based on various filters.
 func (st DBstore) ListAlertInstances(ctx context.Context, cmd *models.ListAlertInstancesQuery) error {