director my_backend random {
    .retries = 5;
    {
        .backend  = {
            .host = "host1.example.com";
            .port = "1000";
            .probe = {
                .url = "/foo/";
                .timeout = 1s;
                .interval = 3s;
                .window = 10;
                .threshold = 8;
            }
        }
        .weight = 9;
    }
    {
        .backend  = {
            .host = "host2.example.com";
            .port = "1000";
            .probe = {
                .url = "/foo/";
                .timeout = 1s;
                .interval = 3s;
                .window = 10;
                .threshold = 8;
            }
        }
        .weight = 1;
    }
}