How to log LoopBack API requests to Keen.io. https://medium.com/@duffn/logging-loopback-api-requests-to-keen-io-9945b52f4243

logging_loopback_api_requests_with_keen_io-main.js

var Keen = require('keen-js');

module.exports = function (myModel) {
  myModel.afterRemote('*', function (ctx, affectedModelInstance, next) {
    // Listen to the finish event of the response to wait
    // for the response to be available
    ctx.res.on('finish', function () {
      var client = new Keen({
        projectId: 'keenprojectid',
        writeKey: 'keenwritekey'
      });

      var queryEvent = {
        ip: ctx.req.ip,
        baseUrl: ctx.req.baseUrl,
        url: ctx.req.url,
        route: ctx.req.route,
        query: ctx.req.query,
        method: ctx.methodString,
        // Here's the header that I wanted to grab
        responseTime: Number(ctx.res._headers['x-response-time']),
        keen: {
          timestamp: new Date().toISOString()
        }
      };

      client.addEvent('queries', queryEvent,
        function (err, res) {
          if (err) {
            console.log(err);
          } else {
            console.log(res);
          }
        });
    });

    // Don't forget to call next
    next();
  });
};