composeMessage(heartbeatJSON, msg) {
        let title = "UptimeKuma Message";
        if (msg != null && heartbeatJSON != null && heartbeatJSON["status"] === UP) {
            title = "UptimeKuma Monitor Up";
        }
        if (msg != null && heartbeatJSON != null && heartbeatJSON["status"] === DOWN) {
            title = "UptimeKuma Monitor Down";
        }
        return {
            msgtype: "text",
            text: {
                content: title + "\n" + msg
            }
        };
    }
Generate the message to send
@param {object} heartbeatJSON Heartbeat details (For Up/Down only)
@param {string} msg General message
@returns {object} Message