[#585] writecache: Count items periodically

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

pkg/local_object_storage/writecache/writecachebbolt/delete.go

@@ -63,7 +63,6 @@ func (c *cache) Delete(ctx context.Context, addr oid.Address) error {
 			storagelog.OpField("db DELETE"),
 		)
 		deleted = true
-		c.objCounters.DecDB()
 		return nil
 	}
 
@@ -75,7 +74,6 @@ func (c *cache) Delete(ctx context.Context, addr oid.Address) error {
 			storagelog.StorageTypeField(wcStorageType),
 			storagelog.OpField("fstree DELETE"),
 		)
-		c.objCounters.DecFS()
 		deleted = true
 	}