[#763] metrics: Add container_objects_total metric

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

pkg/local_object_storage/engine/shards.go

@@ -74,6 +74,18 @@ func (m *metricsWithID) DeleteShardMetrics() {
 	m.mw.DeleteShardMetrics(m.id)
 }
 
+func (m *metricsWithID) SetContainerObjectsCount(cnrID string, objectType string, value uint64) {
+	m.mw.SetContainerObjectCounter(m.id, cnrID, objectType, value)
+}
+
+func (m *metricsWithID) IncContainerObjectsCount(cnrID string, objectType string) {
+	m.mw.IncContainerObjectCounter(m.id, cnrID, objectType)
+}
+
+func (m *metricsWithID) SubContainerObjectsCount(cnrID string, objectType string, value uint64) {
+	m.mw.SubContainerObjectCounter(m.id, cnrID, objectType, value)
+}
+
 // AddShard adds a new shard to the storage engine.
 //
 // Returns any error encountered that did not allow adding a shard.