[#372] node: Add metrics for the error counter in the engine

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

pkg/local_object_storage/engine/shards.go

@@ -62,6 +62,18 @@ func (m *metricsWithID) AddToPayloadSize(size int64) {
 	m.mw.AddToPayloadCounter(m.id, size)
 }
 
+func (m *metricsWithID) IncErrorCounter() {
+	m.mw.IncErrorCounter(m.id)
+}
+
+func (m *metricsWithID) ClearErrorCounter() {
+	m.mw.ClearErrorCounter(m.id)
+}
+
+func (m *metricsWithID) DeleteErrorCounter() {
+	m.mw.DeleteErrorCounter(m.id)
+}
+
 // AddShard adds a new shard to the storage engine.
 //
 // Returns any error encountered that did not allow adding a shard.
@@ -174,6 +186,8 @@ func (e *StorageEngine) removeShards(ids ...string) {
 			continue
 		}
 
+		sh.DeleteErrorCounter()
+
 		ss = append(ss, sh)
 		delete(e.shards, id)
 
@@ -281,6 +295,7 @@ func (e *StorageEngine) SetShardMode(id *shard.ID, m mode.Mode, resetErrorCounte
 		if id.String() == shID {
 			if resetErrorCounter {
 				sh.errorCount.Store(0)
+				sh.Shard.ClearErrorCounter()
 			}
 			return sh.SetMode(m)
 		}