static async sendCertInfo(io, monitorID, userID) {
        let tlsInfo = await R.findOne("monitor_tls_info", "monitor_id = ?", [
            monitorID,
        ]);
        if (tlsInfo != null) {
            io.to(userID).emit("certInfo", monitorID, tlsInfo.info_json);
        }
    }
Send certificate information to client
@param {Server} io Socket server instance
@param {number} monitorID ID of monitor to send
@param {number} userID ID of user to send to
@returns {void}