async function startMonitors() {
    let list = await R.find("monitor", " active = 1 ");

    for (let monitor of list) {
        server.monitorList[monitor.id] = monitor;
    }

    for (let monitor of list) {
        try {
            await monitor.start(io);
        } catch (e) {
            log.error("monitor", e);
        }
        // Give some delays, so all monitors won't make request at the same moment when just start the server.
        await sleep(getRandomInt(300, 1000));
    }
}
Resume active monitors
@returns {Promise<void>}