meta-asrock/meta-e3c256d4i/recipes-phosphor/leds/phosphor-led-manager/led-group-config.json

{
    "leds": [
        {
            "group" : "bmc_booted",
            "members" : [
                {
                    "Name" : "heartbeat",
                    "Action" : "Blink",
                    "DutyOn" : 50,
                    "Period" : 1000
                }
            ]
        },
        {
            "group": "system_fault",
            "members": [
                {
                    "Name": "system-fault",
                    "Action": "Blink",
                    "DutyOn": 50,
                    "Period": 250
                }
            ]
        }
    ]
}