* vendor update: go-gitlab to v0.31.0 * migrate client init to v0.31.0 * refactor
* Add prometheus collector and route * dep ensure -add github.com/prometheus/client_golang/prometheus * dep ensure -update github.com/golang/protobuf * add metrics to reserved usernames * add comment head in metrics package * fix style imports * add metrics settings * add bearer token check * mapping metrics configs * fix lint * update config cheat sheet * update conf sample, typo fix