[#373] blobstor: Add metrics

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

pkg/local_object_storage/blobstor/iterate.go

@@ -3,10 +3,14 @@ package blobstor
 import (
 	"context"
 	"fmt"
+	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
 	"go.uber.org/zap"
 )
 
@@ -18,6 +22,19 @@ import (
 //
 // If handler returns an error, method wraps and returns it immediately.
 func (b *BlobStor) Iterate(ctx context.Context, prm common.IteratePrm) (common.IterateRes, error) {
+	var (
+		startedAt = time.Now()
+		success   = false
+	)
+	defer func() {
+		b.metrics.Iterate(time.Since(startedAt), success)
+	}()
+	ctx, span := tracing.StartSpanFromContext(ctx, "BlobStor.Iterate",
+		trace.WithAttributes(
+			attribute.Bool("ignore_errors", prm.IgnoreErrors),
+		))
+	defer span.End()
+
 	b.modeMtx.RLock()
 	defer b.modeMtx.RUnlock()
 
@@ -27,6 +44,7 @@ func (b *BlobStor) Iterate(ctx context.Context, prm common.IteratePrm) (common.I
 			return common.IterateRes{}, fmt.Errorf("blobstor iterator failure: %w", err)
 		}
 	}
+	success = true
 	return common.IterateRes{}, nil
 }