[#1794] metrics: Track physical object capacity per shard

Signed-off-by: Pavel Karpy <p.karpy@yadro.com>

pkg/local_object_storage/engine/shards.go

@@ -53,6 +53,10 @@ func (m *metricsWithID) AddToContainerSize(cnr string, size int64) {
 	m.mw.AddToContainerSize(cnr, size)
 }
 
+func (m *metricsWithID) AddToPayloadSize(size int64) {
+	m.mw.AddToPayloadCounter(m.id, size)
+}
+
 // AddShard adds a new shard to the storage engine.
 //
 // Returns any error encountered that did not allow adding a shard.