code: func releaseString() string {
  	return fmt.Sprintf("%s/%s, %s, %s\n", runtime.GOOS, runtime.GOARCH, runtime.Version(), gitCommit)
  }
docs: // releaseString returns the release information related to CoreDNS version:
  // <OS>/<ARCH>, <go version>, <commit>
  // e.g.,
  // linux/amd64, go1.8.3, a6d2d7b5