[#373] metabase: Add metrics

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

pkg/local_object_storage/metabase/put.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	gio "io"
+	"time"
 
 	objectCore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
 	storagelog "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/log"
@@ -58,6 +59,14 @@ var (
 // Returns an error of type apistatus.ObjectAlreadyRemoved if object has been placed in graveyard.
 // Returns the object.ErrObjectIsExpired if the object is presented but already expired.
 func (db *DB) Put(ctx context.Context, prm PutPrm) (res PutRes, err error) {
+	var (
+		startedAt = time.Now()
+		success   = false
+	)
+	defer func() {
+		db.metrics.AddMethodDuration("Put", time.Since(startedAt), success)
+	}()
+
 	_, span := tracing.StartSpanFromContext(ctx, "metabase.Put",
 		trace.WithAttributes(
 			attribute.String("address", objectCore.AddressOf(prm.obj).EncodeToString()),
@@ -79,6 +88,7 @@ func (db *DB) Put(ctx context.Context, prm PutPrm) (res PutRes, err error) {
 		return db.put(tx, prm.obj, prm.id, nil, currEpoch)
 	})
 	if err == nil {
+		success = true
 		storagelog.Write(db.log,
 			storagelog.AddressField(objectCore.AddressOf(prm.obj)),
 			storagelog.OpField("metabase PUT"))