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Merge pull request #15537 from aknuds1/arve/clarify-utf8-labels

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OTLP receiver: Don't call NormalizeLabel in `NoUTF8EscapingWithSuffixes` mode
This commit is contained in:
Bartlomiej Plotka 2024-12-05 10:32:48 +01:00 committed by GitHub
parent b7947b9155 a574335d6b
commit a3a88c793d
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GPG key ID: B5690EEEBB952194
3 changed files with 26 additions and 23 deletions
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8
storage/remote/otlptranslator/prometheus/normalize_label.go
View file

@ -29,15 +29,15 @@ import (
//
// Labels that start with non-letter rune will be prefixed with "key_".
// An exception is made for double-underscores which are allowed.
func NormalizeLabel(label string, allowUTF8 bool) string {
// Trivial case
if len(label) == 0 || allowUTF8 {
func NormalizeLabel(label string) string {
// Trivial case.
if len(label) == 0 {
return label
}
label = strutil.SanitizeLabelName(label)
// If label starts with a number, prepend with "key_"
// If label starts with a number, prepend with "key_".
if unicode.IsDigit(rune(label[0])) {
label = "key_" + label
} else if strings.HasPrefix(label, "_") && !strings.HasPrefix(label, "__") {

27
storage/remote/otlptranslator/prometheus/normalize_label_test.go
View file

@ -22,27 +22,24 @@ import (
func TestNormalizeLabel(t *testing.T) {
tests := []struct {
label string
expected string
expectedUTF8 string
label string
expected string
}{
{"", "", ""},
{"label:with:colons", "label_with_colons", "label:with:colons"}, // Without UTF-8 support, colons are only allowed in metric names
{"LabelWithCapitalLetters", "LabelWithCapitalLetters", "LabelWithCapitalLetters"},
{"label!with&special$chars)", "label_with_special_chars_", "label!with&special$chars)"},
{"label_with_foreign_characters_字符", "label_with_foreign_characters___", "label_with_foreign_characters_字符"},
{"label.with.dots", "label_with_dots", "label.with.dots"},
{"123label", "key_123label", "123label"},
{"_label_starting_with_underscore", "key_label_starting_with_underscore", "_label_starting_with_underscore"},
{"__label_starting_with_2underscores", "__label_starting_with_2underscores", "__label_starting_with_2underscores"},
{"", ""},
{"label:with:colons", "label_with_colons"},
{"LabelWithCapitalLetters", "LabelWithCapitalLetters"},
{"label!with&special$chars)", "label_with_special_chars_"},
{"label_with_foreign_characters_字符", "label_with_foreign_characters___"},
{"label.with.dots", "label_with_dots"},
{"123label", "key_123label"},
{"_label_starting_with_underscore", "key_label_starting_with_underscore"},
{"__label_starting_with_2underscores", "__label_starting_with_2underscores"},
}
for i, test := range tests {
t.Run(fmt.Sprintf("test_%d", i), func(t *testing.T) {
result := NormalizeLabel(test.label, false)
result := NormalizeLabel(test.label)
require.Equal(t, test.expected, result)
uTF8result := NormalizeLabel(test.label, true)
require.Equal(t, test.expectedUTF8, uTF8result)
})
}
}

14
storage/remote/otlptranslator/prometheusremotewrite/helper.go
View file

@ -157,7 +157,10 @@ func createAttributes(resource pcommon.Resource, attributes pcommon.Map, setting
// map ensures no duplicate label names.
l := make(map[string]string, maxLabelCount)
for _, label := range labels {
var finalKey = prometheustranslator.NormalizeLabel(label.Name, settings.AllowUTF8)
finalKey := label.Name
if !settings.AllowUTF8 {
finalKey = prometheustranslator.NormalizeLabel(finalKey)
}
if existingValue, alreadyExists := l[finalKey]; alreadyExists {
l[finalKey] = existingValue + ";" + label.Value
} else {
@ -166,7 +169,10 @@ func createAttributes(resource pcommon.Resource, attributes pcommon.Map, setting
}
for _, lbl := range promotedAttrs {
normalized := prometheustranslator.NormalizeLabel(lbl.Name, settings.AllowUTF8)
normalized := lbl.Name
if !settings.AllowUTF8 {
normalized = prometheustranslator.NormalizeLabel(normalized)
}
if _, exists := l[normalized]; !exists {
l[normalized] = lbl.Value
}
@ -204,8 +210,8 @@ func createAttributes(resource pcommon.Resource, attributes pcommon.Map, setting
log.Println("label " + name + " is overwritten. Check if Prometheus reserved labels are used.")
}
// internal labels should be maintained
if !(len(name) > 4 && name[:2] == "__" && name[len(name)-2:] == "__") {
name = prometheustranslator.NormalizeLabel(name, settings.AllowUTF8)
if !settings.AllowUTF8 && !(len(name) > 4 && name[:2] == "__" && name[len(name)-2:] == "__") {
name = prometheustranslator.NormalizeLabel(name)
}
l[name] = extras[i+1]
}