microprom: add BenchmarkFormatLabels

1 files changed, 25 insertions, 0 deletions

diff --git a/microprom/labels_test.go b/microprom/labels_test.go
index 0414be8..291d1da 100644
--- a/microprom/labels_test.go
+++ b/microprom/labels_test.go
@@ -4,6 +4,7 @@
 package microprom_test
 
 import (
+	"fmt"
 	"testing"
 
 	"go.xyrillian.de/gg/assert"
@@ -22,3 +23,27 @@ func TestFormatLabels(t *testing.T) {
 	labels = ms.FormatLabels(names, "bar\\\n\\bar", `"universe\world"`)
 	assert.Equal(t, labels, `foo="bar\\\n\\bar",hello="\"universe\\world\""`)
 }
+
+func BenchmarkFormatLabels(b *testing.B) {
+	ms := microprom.NewMetricSet(microprom.SyntaxPrometheusLegacy, nil)
+	const (
+		appVersion = "1.2.3"
+		node       = "fcae8f43-87d4-4644-b28c-7bb1c340fcea"
+		region     = "us-east"
+		status     = "404"
+	)
+	names := microprom.NewLabelNames("app_version", "node", "region", "status")
+
+	b.Run("method=fmt.Sprintf", func(b *testing.B) {
+		for b.Loop() {
+			_ = fmt.Sprintf(`app_version=%q,node=%q,region=%q,status=%q`,
+				appVersion, node, region, status,
+			)
+		}
+	})
+	b.Run("method=FormatLabels", func(b *testing.B) {
+		for b.Loop() {
+			_ = ms.FormatLabels(names, appVersion, node, region, status)
+		}
+	})
+}