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lib/promscrape: add a comment explaining the logic behind adding exported_ perfix to metric names

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This is a follow-up for 7b87fac8e7

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3557
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3406
This commit is contained in:
Aliaksandr Valialkin 2023-02-01 12:00:50 -08:00
parent 3c1e455805
commit ac695f36bb
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1 changed files with 18 additions and 8 deletions
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26
lib/promscrape/scrapework.go
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@ -904,14 +904,24 @@ func (sw *scrapeWork) addAutoTimeseries(wc *writeRequestCtx, name string, value
func (sw *scrapeWork) addRowToTimeseries(wc *writeRequestCtx, r *parser.Row, timestamp int64, needRelabel bool) {
metric := r.Metric
if needRelabel && isAutoMetric(metric) {
if !sw.Config.HonorLabels && len(r.Tags) == 0 {
bb := bbPool.Get()
bb.B = append(bb.B, "exported_"...)
bb.B = append(bb.B, metric...)
metric = bytesutil.InternBytes(bb.B)
bbPool.Put(bb)
}
// Add `exported_` prefix to metrics, which clash with the automatically generated
// metric names only if the following conditions are met:
//
// - The `honor_labels` option isn't set to true in the scrape_config.
// If `honor_labels: true`, then the scraped metric name must remain unchanged
// because the user explicitly asked about it in the config.
// - The metric has no labels (tags). If it has labels, then the metric value
// will be written into a separate time series comparing to automatically generated time series.
//
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3557
// and https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3406
if needRelabel && !sw.Config.HonorLabels && len(r.Tags) == 0 && isAutoMetric(metric) {
bb := bbPool.Get()
bb.B = append(bb.B, "exported_"...)
bb.B = append(bb.B, metric...)
metric = bytesutil.InternBytes(bb.B)
bbPool.Put(bb)
}
labelsLen := len(wc.labels)
targetLabels := sw.Config.Labels.GetLabels()