go-zero/example/graceful/etcd/api/etc/graceful-api.json

{
    "Name": "graceful-api",
    "Host": "0.0.0.0",
    "Port": 8888,
    "MaxConns": 1000000,
    "Rpc": {
        "Etcd": {
            "Hosts": ["etcd.discov:2379"],
            "Key": "zrpc"
        }
    }
}