testlog.js

var winston_graylog2_settings = {
    name: 'graylog2',
    level: 'debug',
    handleExceptions: true,
    graylog: {
        servers: [{host: "logstash", port: 12201}]
    }
};

var winston = require("winston");
winston.level = 'debug';
winston.add(require("winston-graylog2"), winston_graylog2_settings);

winston.info('info test message');
winston.debug('debug test message');
winston.warn('warn test message');

winston.info('this is \n multiline \n comment');