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prefix with _ if name begins with a number #1657

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prefix with _ if name begins with a number #1657

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969a8fb
prefix with `_` if name begins with a number
shubhindia Mar 11, 2025
ab349bd
Use regex to filter metrics starting with digits
shubhindia Mar 12, 2025
4c7b5f9
Make metricNumberPrefixRE a var
shubhindia Mar 12, 2025
7595933
Add a test for '_' prefix
shubhindia Mar 12, 2025
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6 changes: 6 additions & 0 deletions pkg/promutil/prometheus.go
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Original file line number Diff line number Diff line change
Expand Up @@ -194,6 +194,12 @@ func PromStringTag(text string, labelsSnakeCase bool) (bool, string) {

// sanitize replaces some invalid chars with an underscore
func sanitize(text string) string {

// metrics starting with a digit violate the prometheus metric naming convention, so we add an underscore
if len(text) > 0 && text[0] >= '0' && text[0] <= '9' {
text = "_" + text
}

if strings.ContainsAny(text, "“%") {
// fallback to the replacer for complex cases:
// - '“' is non-ascii rune
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