add metrics

internal/metrics/metrics.go

@@ -118,6 +118,11 @@ var (
 		Name:      "http3_blob_download_total",
 		Help:      "Total number of blobs downloaded from reflector through QUIC protocol",
 	})
+	HttpDownloadCount = promauto.NewCounter(prometheus.CounterOpts{
+		Namespace: ns,
+		Name:      "http_blob_download_total",
+		Help:      "Total number of blobs downloaded from reflector through HTTP protocol",
+	})
 
 	CacheHitCount = promauto.NewCounterVec(prometheus.CounterOpts{
 		Namespace: ns,
@@ -204,6 +209,11 @@ var (
 		Name:      "udp_out_bytes",
 		Help:      "Total number of bytes streamed out through UDP",
 	})
+	MtrOutBytesHttp = promauto.NewCounter(prometheus.CounterOpts{
+		Namespace: ns,
+		Name:      "http_out_bytes",
+		Help:      "Total number of bytes streamed out through UDP",
+	})
 	MtrInBytesReflector = promauto.NewCounter(prometheus.CounterOpts{
 		Namespace: ns,
 		Name:      "reflector_in_bytes",

server/http/routes.go

@@ -5,7 +5,10 @@ import (
 
 	"github.com/gin-gonic/gin"
 	"github.com/lbryio/lbry.go/v2/extras/errors"
+
+	"github.com/lbryio/reflector.go/internal/metrics"
 	"github.com/lbryio/reflector.go/store"
+
 	log "github.com/sirupsen/logrus"
 )
 
@@ -33,6 +36,9 @@ func (s *Server) getBlob(c *gin.Context) {
 		_ = c.AbortWithError(http.StatusInternalServerError, err)
 		return
 	}
+	metrics.MtrOutBytesHttp.Add(float64(len(blob)))
+	metrics.BlobDownloadCount.Inc()
+	metrics.HttpDownloadCount.Inc()
 	c.Header("Via", serialized)
 	c.Header("Content-Disposition", "filename="+hash)
 	c.Data(http.StatusOK, "application/octet-stream", blob)

store/http.go

@@ -8,10 +8,11 @@ import (
 	"sync"
 	"time"
 
-	"github.com/lbryio/lbry.go/v2/extras/errors"
-	"github.com/lbryio/lbry.go/v2/stream"
 	"github.com/lbryio/reflector.go/internal/metrics"
 	"github.com/lbryio/reflector.go/shared"
+
+	"github.com/lbryio/lbry.go/v2/extras/errors"
+	"github.com/lbryio/lbry.go/v2/stream"
 )
 
 // NoopStore is a store that does nothing