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app/vmselect/promql: make sure that label_replace() doesn't create an empty dst_label if the src_label doesn't match regex

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This commit is contained in:
Aliaksandr Valialkin 2022-12-21 20:19:58 -08:00
parent 31886aef3d
commit d3de110070
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1 changed files with 1 additions and 1 deletions
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2
app/vmselect/promql/transform.go
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@ -1873,12 +1873,12 @@ func labelReplace(tss []*timeseries, srcLabel string, r *regexp.Regexp, dstLabel
replacementBytes := []byte(replacement)
for _, ts := range tss {
mn := &ts.MetricName
dstValue := getDstValue(mn, dstLabel)
srcValue := mn.GetTagValue(srcLabel)
if !r.Match(srcValue) {
continue
}
b := r.ReplaceAll(srcValue, replacementBytes)
dstValue := getDstValue(mn, dstLabel)
*dstValue = append((*dstValue)[:0], b...)
if len(b) == 0 {
mn.RemoveTag(dstLabel)