Fixed desynchronized comment and behavior for log interval

In 64ce7dff, the log interval is modified while the comment is left unchanged.

broker/metrics.go

@@ -166,7 +166,7 @@ func NewMetrics(metricsLogger *log.Logger) (*Metrics, error) {
 	m.logger = metricsLogger
 	m.promMetrics = initPrometheus()
 
-	// Write to log file every hour with updated metrics
+	// Write to log file every day with updated metrics
 	go m.logMetrics()
 
 	return m, nil