metric data format is Wrong!

[lshguo]

In the code of "app.js", there is one line:
response.end("# TYPE qps gauge\nqps " + avgQps + "\n");
should be changed to:
response.end("# HELP qps querry per second\n# TYPE qps gauge\nqps " + avgQps + "\n");
the string of "# HELP ***" is describe in:
https://prometheus.io/docs/instrumenting/exposition_formats/

It worked in my environment where kuber version is 1.4.2, and heapster version is 1.3.0

Thanks for your attention!