samples/cartridge-groups/app-group.json

{
    "name": "app-group",
    "cartridges": [
        "tomcat",
        "php"
    ],
    "dependencies": {
        "terminationBehaviour": "terminate-all",
        "startupOrders": [
            {
                "aliases": [
                    "cartridge.my-php",
                    "cartridge.my-tomcat"
                ]
            }
        ]
    },
    "groupScalingEnabled": true
}