placeholders:
    placeholders:
        scripts_after:
            items:
                sync_js:
                    order: 310
                maintenance_js:
                    order: 220

    items:
        sync_js:
            template: OroSyncBundle::sync_js.html.twig
            applicable: "@oro_security.security_facade->hasLoggedUser()"
        maintenance_js:
            template: OroSyncBundle::maintenance_js.html.twig

placeholders:
    placeholders:
        scripts_after:
            items:
                sync_js:
                    order: 310
                maintenance_js:
                    order: 220
                ping_js:
                    order: 230
    items:
        sync_js:
            template: OroSyncBundle::sync_js.html.twig
            applicable: "@oro_security.security_facade->hasLoggedUser()"
        maintenance_js:
            template: OroSyncBundle::maintenance_js.html.twig
        ping_js:
            template: OroSyncBundle::ping_js.html.twig

Enable ping request in websocket
BAP-11097: Enable ping request in websocket
