[#373] blobstor: Add metrics

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

pkg/local_object_storage/blobstor/blobstor.go

@@ -43,10 +43,12 @@ type cfg struct {
 	compression compression.Config
 	log         *logger.Logger
 	storage     []SubStorage
+	metrics     Metrics
 }
 
 func initConfig(c *cfg) {
 	c.log = &logger.Logger{Logger: zap.L()}
+	c.metrics = &noopMetrics{}
 }
 
 // New creates, initializes and returns new BlobStor instance.
@@ -113,3 +115,9 @@ func (b *BlobStor) SetReportErrorFunc(f func(string, error)) {
 		b.storage[i].Storage.SetReportErrorFunc(f)
 	}
 }
+
+func WithMetrics(m Metrics) Option {
+	return func(c *cfg) {
+		c.metrics = m
+	}
+}