Add comments for exported functions

stats/channels.go

 	}
 }
 
+// GetStats returns a snapshot of Stats instance.
 func GetStats() Stats {
 	rpcChan := make(chan Stats)
 	statsChan <- rpcChan

stats/init.go

 	"github.com/9seconds/mtg/config"
 )
 
+// Init initializes stats subsystem.
 func Init(conf *config.Config) error {
 	if conf.StatsD.Enabled {
 		client, err := newStatsd(conf)

stats/stats.go

 	return json.Marshal(value)
 }
 
+// Stats represents a statistics of the proxy.
 type Stats struct {
 	URLs        config.IPURLs `json:"urls"`
 	Connections connections   `json:"connections"`
 	s.Crashes++
 }
 
+// NewStats creates a new instance of Stats structure.
 func NewStats(conf *config.Config) *Stats {
 	return &Stats{
 		URLs:   conf.GetURLs(),