Dashboard Tags: Validate max length (#116047)

pkg/services/dashboards/database/database.go

@@ -542,6 +542,9 @@ func (d *dashboardStore) saveDashboard(ctx context.Context, sess *db.Session, cm
 	tags := dash.GetTags()
 	if len(tags) > 0 {
 		for _, tag := range tags {
+			if len(tag) > 50 {
+				return nil, dashboards.ErrDashboardTagTooLong
+			}
 			if _, err := sess.Insert(dashboardTag{DashboardId: dash.ID, Term: tag, OrgID: dash.OrgID, DashboardUID: dash.UID}); err != nil {
 				return nil, err
 			}