如何从Bunyan日志输出中删除主机名、pid和其他默认字段？

const bunyan = require('bunyan');

const logger = bunyan.createLogger({
  name: 'myLogger',
  streams: [
    {
      level: 'info',
      stream: process.stdout
    }
  ],
  serializers: bunyan.stdSerializers
});

const bunyan = require('bunyan');

const logger = bunyan.createLogger({
  name: 'myLogger',
  streams: [
    {
      level: 'info',
      stream: process.stdout
    }
  ],
  serializers: {
    err: bunyan.stdSerializers.err,
    req: bunyan.stdSerializers.req,
    res: bunyan.stdSerializers.res,
    // 重写默认的序列化函数，返回一个只包含你想要的字段的对象
    // 这里我们只保留了msg和level字段
    info: function(info) {
      return {
        msg: info.msg,
        level: info.level
      };
    }
  }
});

logger.info({ msg: 'This is a log message', additionalField: 'value' });

{"msg":"This is a log message","level":30}