[#373] blobovnicza: Add metrics

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

pkg/local_object_storage/blobovnicza/blobovnicza.go

@@ -31,6 +31,8 @@ type cfg struct {
 	objSizeLimit uint64
 
 	log *logger.Logger
+
+	metrics Metrics
 }
 
 type boltDBCfg struct {
@@ -52,6 +54,7 @@ func defaultCfg(c *cfg) {
 		fullSizeLimit: 1 << 30, // 1GB
 		objSizeLimit:  1 << 20, // 1MB
 		log:           &logger.Logger{Logger: zap.L()},
+		metrics:       &noopMetrics{},
 	}
 }
 
@@ -112,3 +115,10 @@ func WithReadOnly(ro bool) Option {
 		c.boltOptions.ReadOnly = ro
 	}
 }
+
+// WithMetrics returns an option to set metrics storage.
+func WithMetrics(m Metrics) Option {
+	return func(c *cfg) {
+		c.metrics = m
+	}
+}