[#373] blobovnizca: Add missed/fix tracing spans

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

pkg/local_object_storage/blobovnicza/exists.go

@@ -1,17 +1,30 @@
 package blobovnicza
 
 import (
+	"context"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"go.etcd.io/bbolt"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
 )
 
 // Exists check if object with the specified address is stored in b.
-func (b *Blobovnicza) Exists(addr oid.Address) (bool, error) {
+func (b *Blobovnicza) Exists(ctx context.Context, addr oid.Address) (bool, error) {
 	var (
-		exists  bool
-		addrKey = addressKey(addr)
+		exists = false
 	)
 
+	_, span := tracing.StartSpanFromContext(ctx, "Blobovnicza.Exists",
+		trace.WithAttributes(
+			attribute.String("path", b.path),
+			attribute.String("address", addr.EncodeToString()),
+		))
+	defer span.End()
+
+	addrKey := addressKey(addr)
+
 	err := b.boltDB.View(func(tx *bbolt.Tx) error {
 		return tx.ForEach(func(_ []byte, buck *bbolt.Bucket) error {
 			exists = buck.Get(addrKey) != nil