[skip ci] Fix golint for metricinfo/cache.go (#12620)

Signed-off-by: Nshaoyue.chen <shaoyue.chen@zilliz.com>

internal/util/metricsinfo/cache.go

@@ -18,12 +18,12 @@ import (
 	"github.com/milvus-io/milvus/internal/proto/milvuspb"
 )
 
-// TODO(dragondriver): load from config file
 // DefaultMetricsRetention defines the default retention of metrics cache.
+// TODO(dragondriver): load from config file
 const DefaultMetricsRetention = time.Second * 5
 
-// TODO(dragondriver): we can use a map to manage the metrics if there are too many kind metrics
 // MetricsCacheManager manage the cache of metrics information.
+// TODO(dragondriver): we can use a map to manage the metrics if there are too many kind metrics
 type MetricsCacheManager struct {
 	systemInfoMetrics                *milvuspb.GetMetricsResponse
 	systemInfoMetricsInvalid         bool