Re-introduce grafana#3178.

Lost during a merge/rebase of grafana@6cc41f9 🤷

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

pkg/distributor/http.go

@@ -4,17 +4,35 @@ import (
 	"math"
 	"net/http"
 
-	"github.com/weaveworks/common/httpgrpc"
-
 	"github.com/cortexproject/cortex/pkg/util"
+	"github.com/dustin/go-humanize"
+	"github.com/go-kit/kit/log/level"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/weaveworks/common/httpgrpc"
+	"github.com/weaveworks/common/user"
 
 	"github.com/grafana/loki/pkg/loghttp"
 	"github.com/grafana/loki/pkg/logproto"
 	"github.com/grafana/loki/pkg/logql/unmarshal"
 	unmarshal_legacy "github.com/grafana/loki/pkg/logql/unmarshal/legacy"
+	lokiutil "github.com/grafana/loki/pkg/util"
 )
 
-var contentType = http.CanonicalHeaderKey("Content-Type")
+var (
+	contentType = http.CanonicalHeaderKey("Content-Type")
+
+	bytesIngested = promauto.NewCounterVec(prometheus.CounterOpts{
+		Namespace: "loki",
+		Name:      "distributor_bytes_received_total",
+		Help:      "The total number of uncompressed bytes received per tenant",
+	}, []string{"tenant"})
+	linesIngested = promauto.NewCounterVec(prometheus.CounterOpts{
+		Namespace: "loki",
+		Name:      "distributor_lines_received_total",
+		Help:      "The total number of lines received per tenant",
+	}, []string{"tenant"})
+)
 
 const applicationJSON = "application/json"
 
@@ -41,8 +59,46 @@ func (d *Distributor) PushHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func ParseRequest(r *http.Request) (*logproto.PushRequest, error) {
+	userID, _ := user.ExtractOrgID(r.Context())
+	logger := util.WithContext(r.Context(), util.Logger)
+	body := lokiutil.NewSizeReader(r.Body)
+	contentType := r.Header.Get(contentType)
 	var req logproto.PushRequest
 
+	defer func() {
+		var (
+			entriesSize      int64
+			streamLabelsSize int64
+			totalEntries     int64
+		)
+
+		for _, s := range req.Streams {
+			streamLabelsSize += int64(len(s.Labels))
+			for _, e := range s.Entries {
+				totalEntries++
+				entriesSize += int64(len(e.Line))
+			}
+		}
+
+		// incrementing tenant metrics if we have a tenant.
+		if totalEntries != 0 && userID != "" {
+			bytesIngested.WithLabelValues(userID).Add(float64(entriesSize))
+			linesIngested.WithLabelValues(userID).Add(float64(totalEntries))
+		}
+
+		level.Debug(logger).Log(
+			"msg", "push request parsed",
+			"path", r.URL.Path,
+			"contentType", contentType,
+			"bodySize", humanize.Bytes(uint64(body.Size())),
+			"streams", len(req.Streams),
+			"entries", totalEntries,
+			"streamLabelsSize", humanize.Bytes(uint64(streamLabelsSize)),
+			"entriesSize", humanize.Bytes(uint64(entriesSize)),
+			"totalSize", humanize.Bytes(uint64(entriesSize+streamLabelsSize)),
+		)
+	}()
+
 	switch r.Header.Get(contentType) {
 	case applicationJSON:
 		var err error