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lib/storage: log original labels set when label value is truncated (#3952)

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lib/storage: log original labels set when label value is truncated
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Zakhar Bessarab 2023-03-14 13:59:40 +04:00 committed by GitHub
parent 4d68f5b1fc
commit 6a5d236245
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2 changed files with 18 additions and 2 deletions
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2
docs/CHANGELOG.md
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@ -15,6 +15,8 @@ The following tip changes can be tested by building VictoriaMetrics components f
## tip
* FEATURE: log metrics with truncated labels if the length of label value in the ingested metric exceeds `-maxLabelValueLen`. This should simplify debugging for this case.
## [v1.89.1](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.89.1)
Released at 2023-03-12

18
lib/storage/metric_name.go
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@ -480,7 +480,7 @@ func MarshalMetricNameRaw(dst []byte, labels []prompb.Label) []byte {
label.Name = label.Name[:maxLabelNameLen]
}
if len(label.Value) > maxLabelValueLen {
atomic.AddUint64(&TooLongLabelValues, 1)
trackTruncatedLabels(labels, label)
label.Value = label.Value[:maxLabelValueLen]
}
if len(label.Value) == 0 {
@ -528,7 +528,7 @@ func trackDroppedLabels(labels, droppedLabels []prompb.Label) {
select {
case <-droppedLabelsLogTicker.C:
// Do not call logger.WithThrottler() here, since this will result in increased CPU usage
// because labelsToString() will be called with each trackDroppedLAbels call.
// because labelsToString() will be called with each trackDroppedLabels call.
logger.Warnf("dropping %d labels for %s; dropped labels: %s; either reduce the number of labels for this metric "+
"or increase -maxLabelsPerTimeseries=%d command-line flag value",
len(droppedLabels), labelsToString(labels), labelsToString(droppedLabels), maxLabelsPerTimeseries)
@ -536,7 +536,21 @@ func trackDroppedLabels(labels, droppedLabels []prompb.Label) {
}
}
func trackTruncatedLabels(labels []prompb.Label, truncated *prompb.Label) {
atomic.AddUint64(&TooLongLabelValues, 1)
select {
case <-truncatedLabelsLogTicker.C:
// Do not call logger.WithThrottler() here, since this will result in increased CPU usage
// because labelsToString() will be called with each trackTruncatedLabels call.
logger.Warnf("truncated label value as it exceeds configured maximal label value length: max %d, actual %d;"+
" truncated label: %s; original labels: %s; either reduce the label value length or increase -maxLabelValueLen=%d;",
maxLabelValueLen, len(truncated.Value), truncated.Name, labelsToString(labels), maxLabelValueLen)
default:
}
}
var droppedLabelsLogTicker = time.NewTicker(5 * time.Second)
var truncatedLabelsLogTicker = time.NewTicker(5 * time.Second)
func labelsToString(labels []prompb.Label) string {
labelsCopy := append([]prompb.Label{}, labels...)