koa-bunyan-logger中的ctx.time()怎么用的

Question

试着用koa-bunyan-logger日志处理，但是不知道为什么，没有官方的演示的效果

const setLogger = (app) => {
  app.use(koaLogger(logger));
  app.use(koaLogger.timeContext());

  app.use(async function (ctx, next) {
    ctx.time(ctx.path);
    await next();
    ctx.timeEnd(ctx.path);

    ctx.log.info({method: ctx.method, path: ctx.path, http: ctx.status},
      `${ctx.method} => ${ctx.path} => ${ctx.status}`);
  });
};

打出的日志为

{"name":"demo","hostname":"******.local","pid":31265,"level":30,"method":"GET","path":"/api/health/status","http":200,"msg":"GET => /api/health/status => 200","time":"2019-03-21T06:29:05.678Z","v":0}

没有官方出现的"label":"get data","duration":102

{"name":"koa","hostname":"localhost","pid":9228,"level":10,"label":"get data","duration":102,"msg":"","time":"2014-11-07T01:45:53.711Z","v":0}
{"name":"koa","hostname":"localhost","pid":9228,"level":10,"label":"serialize","duration":401,"msg":"","time":"2014-11-07T01:45:54.116Z","v":0}