Dashboards: Prevent title longer than 5 000 characters (#101554)

Co-authored-by: AgnesToulet <35176601+AgnesToulet@users.noreply.github.com>

pkg/services/dashboards/errors.go

@@ -42,6 +42,11 @@ var (
 		StatusCode: 400,
 		Status:     "empty-name",
 	}
+	ErrDashboardTitleTooLong = DashboardErr{
+		Reason:     "Dashboard title cannot contain more than 5 000 characters",
+		StatusCode: 400,
+		Status:     "title-too-long",
+	}
 	ErrDashboardFolderCannotHaveParent = DashboardErr{
 		Reason:     "A Dashboard Folder cannot be added to another folder",
 		StatusCode: 400,

pkg/services/dashboards/service/dashboard_service.go

@@ -341,6 +341,10 @@ func (dr *DashboardServiceImpl) BuildSaveDashboardCommand(ctx context.Context, d
 		return nil, dashboards.ErrDashboardTitleEmpty
 	}
 
+	if len(dash.Title) > 5000 {
+		return nil, dashboards.ErrDashboardTitleTooLong
+	}
+
 	if len(dto.Message) > 500 {
 		return nil, dashboards.ErrDashboardMessageTooLong
 	}