[#373] metrics: Add blobstor metrics

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/metrics/node.go

@@ -15,34 +15,24 @@ type NodeMetrics struct {
 	treeService   *treeServiceMetrics
 	epoch         prometheus.Gauge
 	fstree        *fstreeMetrics
+	blobstore     *blobstoreMetrics
 }
 
 func NewNodeMetrics() *NodeMetrics {
-	objectService := newObjectServiceMetrics()
-
-	engine := newEngineMetrics()
-
-	state := newStateMetrics()
-
-	replicator := newReplicatorMetrics()
-
-	treeService := newTreeServiceMetrics()
-
-	epoch := metrics.NewGauge(prometheus.GaugeOpts{
-		Namespace: namespace,
-		Subsystem: innerRingSubsystem,
-		Name:      "epoch",
-		Help:      "Current epoch as seen by inner-ring node.",
-	})
-
 	return &NodeMetrics{
-		objectService: objectService,
-		engine:        engine,
-		state:         state,
-		replicator:    replicator,
-		treeService:   treeService,
-		epoch:         epoch,
-		fstree:        newFSTreeMetrics(),
+		objectService: newObjectServiceMetrics(),
+		engine:        newEngineMetrics(),
+		state:         newStateMetrics(),
+		replicator:    newReplicatorMetrics(),
+		treeService:   newTreeServiceMetrics(),
+		epoch: metrics.NewGauge(prometheus.GaugeOpts{
+			Namespace: namespace,
+			Subsystem: innerRingSubsystem,
+			Name:      "epoch",
+			Help:      "Current epoch as seen by inner-ring node.",
+		}),
+		fstree:    newFSTreeMetrics(),
+		blobstore: newBlobstoreMetrics(),
 	}
 }
 
@@ -74,3 +64,7 @@ func (m *NodeMetrics) State() StateMetrics {
 func (m *NodeMetrics) FSTree() FSTreeMetrics {
 	return m.fstree
 }
+
+func (m *NodeMetrics) Blobstore() BlobstoreMetrics {
+	return m.blobstore
+}