Add RequestsBlocked stat counter

http/routes.go

@@ -44,6 +44,7 @@ func (s *Server) serveAnnounce(w http.ResponseWriter, r *http.Request, p httprou
 
 	if err == models.ErrMalformedRequest {
 		writer.WriteError(err)
+		stats.RecordEvent(stats.BlockedRequest)
 		return http.StatusOK, nil
 	} else if err != nil {
 		return http.StatusInternalServerError, err
@@ -53,6 +54,7 @@ func (s *Server) serveAnnounce(w http.ResponseWriter, r *http.Request, p httprou
 
 	if err == models.ErrBadRequest {
 		writer.WriteError(err)
+		stats.RecordEvent(stats.BlockedRequest)
 		return http.StatusOK, nil
 	} else if err != nil {
 		return http.StatusInternalServerError, err
@@ -68,6 +70,7 @@ func (s *Server) serveScrape(w http.ResponseWriter, r *http.Request, p httproute
 
 	if err == models.ErrMalformedRequest {
 		writer.WriteError(err)
+		stats.RecordEvent(stats.BlockedRequest)
 		return http.StatusOK, nil
 	} else if err != nil {
 		return http.StatusInternalServerError, err

stats/stats.go

@@ -32,6 +32,7 @@ const (
 	ClosedConnection
 
 	HandledRequest
+	BlockedRequest
 	ErroredRequest
 
 	ResponseTime
@@ -82,6 +83,7 @@ type Stats struct {
 
 	RequestsHandled uint64 `json:"requests_handled"`
 	RequestsErrored uint64 `json:"requests_errored"`
+	RequestsBlocked uint64 `json:"requests_blocked"`
 
 	ResponseTime PercentileTimes  `json:"response_time"`
 	MemStats     *MemStatsWrapper `json:"mem,omitempty"`
@@ -198,6 +200,9 @@ func (s *Stats) handleEvent(event int) {
 	case HandledRequest:
 		s.RequestsHandled++
 
+	case BlockedRequest:
+		s.RequestsBlocked++
+
 	case ErroredRequest:
 		s.RequestsErrored++