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Avoid copy during remote write if external labels is empty

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Signed-off-by: Xiaochao Dong (@damnever) <the.xcdong@gmail.com>
This commit is contained in:
Xiaochao Dong (@damnever) 2022-12-30 19:11:29 +08:00
parent 49f775d8a0
commit 2d61d012ff
1 changed files with 4 additions and 0 deletions
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4
storage/remote/queue_manager.go
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@ -847,6 +847,10 @@ func (t *QueueManager) releaseLabels(ls labels.Labels) {
// processExternalLabels merges externalLabels into ls. If ls contains
// a label in externalLabels, the value in ls wins.
func processExternalLabels(ls labels.Labels, externalLabels []labels.Label) labels.Labels {
if len(externalLabels) == 0 {
return ls
}
b := labels.NewScratchBuilder(ls.Len() + len(externalLabels))
j := 0
ls.Range(func(l labels.Label) {