add unixfs get metric

License: MIT
Signed-off-by: whyrusleeping <why@ipfs.io>

core/corehttp/gateway_handler.go

@@ -123,6 +123,7 @@ func (i *gatewayHandler) optionsHandler(w http.ResponseWriter, r *http.Request)
 }
 
 func (i *gatewayHandler) getOrHeadHandler(w http.ResponseWriter, r *http.Request) {
+	begin := time.Now()
 	urlPath := r.URL.Path
 	escapedURLPath := r.URL.EscapedPath()
 
@@ -172,6 +173,7 @@ func (i *gatewayHandler) getOrHeadHandler(w http.ResponseWriter, r *http.Request
 		webError(w, "ipfs cat "+escapedURLPath, err, http.StatusNotFound)
 		return
 	}
+	unixfsGetMetric.Observe(time.Since(begin).Seconds())
 
 	defer dr.Close()
 

core/corehttp/metrics.go

@@ -97,6 +97,9 @@ var (
 	peersTotalMetric = prometheus.NewDesc(
 		prometheus.BuildFQName("ipfs", "p2p", "peers_total"),
 		"Number of connected peers", []string{"transport"}, nil)
+	unixfsGetMetric = prometheus.NewSummary(prometheus.SummaryOpts{
+		Name: "unixfsGet",
+	})
 )
 
 type IpfsNodeCollector struct {