[#948] metrics: Set actual value for shard_id after restart

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

pkg/local_object_storage/engine/metrics.go

@@ -44,6 +44,10 @@ type gcMetrics struct {
 	shardID string
 }
 
+func (m *gcMetrics) SetShardID(id string) {
+	m.shardID = id
+}
+
 func (m *gcMetrics) AddRunDuration(d time.Duration, success bool) {
 	m.storage.AddRunDuration(m.shardID, d, success)
 }