refactor: replace explicit log level constants with iota

Author: armin

kafka_exporter.go

@@ -37,9 +37,9 @@ const (
 )
 
 const (
-	INFO  = 0
-	DEBUG = 1
-	TRACE = 2
+	INFO = iota
+	DEBUG
+	TRACE
 )
 
 var (
@@ -657,7 +657,7 @@ func (e *Exporter) collect(ch chan<- prometheus.Metric) {
 						consumergroupCurrentOffset, prometheus.GaugeValue, float64(currentOffset), group.GroupId, topic, strconv.FormatInt(int64(partition), 10),
 					)
 					e.mu.Lock()
-					currentPartitionOffset, currentPartitionOffsetError := e.client.GetOffset(topic, partition, sarama.OffsetNewest) 
+					currentPartitionOffset, currentPartitionOffsetError := e.client.GetOffset(topic, partition, sarama.OffsetNewest)
 					if currentPartitionOffsetError != nil {
 						klog.Errorf("Cannot get current offset of topic %s partition %d: %v", topic, partition, currentPartitionOffsetError)
 					} else {
@@ -673,11 +673,11 @@ func (e *Exporter) collect(ch chan<- prometheus.Metric) {
 							lag = currentPartitionOffset - offsetFetchResponseBlock.Offset
 							lagSum += lag
 						}
-		
+
 						ch <- prometheus.MustNewConstMetric(
 							consumergroupLag, prometheus.GaugeValue, float64(lag), group.GroupId, topic, strconv.FormatInt(int64(partition), 10),
 						)
-					} 
+					}
 					e.mu.Unlock()
 				}
 				ch <- prometheus.MustNewConstMetric(