Fix convention violating names for generated collector metrics

Signed-off-by: Kemal Akkoyun <kakkoyun@gmail.com>

CHANGELOG.md

@@ -3,6 +3,7 @@
 * [CHANGE] Minimum required Go version is now 1.16.
 * [CHANGE] Added `collectors.WithGoCollections` that allows to choose what collection of Go runtime metrics user wants: Equivalent of [`MemStats` structure](https://pkg.go.dev/runtime#MemStats) configured using `GoRuntimeMemStatsCollection`, new based on dedicated [runtime/metrics](https://pkg.go.dev/runtime/metrics) metrics represented by `GoRuntimeMetricsCollection` option, or both by specifying `GoRuntimeMemStatsCollection | GoRuntimeMetricsCollection` flag.
 * [CHANGE] :warning: Change in `collectors.NewGoCollector` metrics: Reverting addition of new ~80 runtime metrics by default. You can enable this back with `GoRuntimeMetricsCollection` option or `GoRuntimeMemStatsCollection | GoRuntimeMetricsCollection`  for smooth transition.
+* [BUGFIX] Fix the bug that causes generated histogram metric names to end with `_total`. `go_gc_heap_allocs_by_size_bytes_total` -> `go_gc_heap_allocs_by_size_bytes`, `go_gc_heap_frees_by_size_bytes_total` -> `go_gc_heap_allocs_by_size_bytes` and`go_gc_pauses_seconds_total` -> `go_gc_pauses_seconds`.
 
 ## 1.12.1 / 2022-01-29
 

prometheus/gen_go_collector_metrics_set.go

@@ -39,11 +39,11 @@ func main() {
 	}
 	toolVersion := runtime.Version()
 	mtv := majorVersion(toolVersion)
-	mv != majorVersion(os.Args[1])
+	mv := majorVersion(os.Args[1])
 	if mtv != mv {
 		log.Fatalf("using Go version %q but expected Go version %q", mtv, mv)
 	}
-	version, err := parseVersion(os.Args[1])
+	version, err := parseVersion(mv)
 	if err != nil {
 		log.Fatalf("parsing Go version: %v", err)
 	}

prometheus/go_collector_latest_test.go

@@ -24,8 +24,9 @@ import (
 	"sync"
 	"testing"
 
-	"github.com/prometheus/client_golang/prometheus/internal"
 	dto "github.com/prometheus/client_model/go"
+
+	"github.com/prometheus/client_golang/prometheus/internal"
 )
 
 func TestRmForMemStats(t *testing.T) {
@@ -121,7 +122,7 @@ func TestBatchHistogram(t *testing.T) {
 
 	var mhist Metric
 	for _, m := range goMetrics {
-		if m.Desc().fqName == "go_gc_heap_allocs_by_size_bytes_total" {
+		if m.Desc().fqName == "go_gc_heap_allocs_by_size_bytes" {
 			mhist = m
 			break
 		}

prometheus/internal/go_runtime_metrics.go

@@ -62,7 +62,7 @@ func RuntimeMetricsToProm(d *metrics.Description) (string, string, string, bool)
 	// other data.
 	name = strings.ReplaceAll(name, "-", "_")
 	name = name + "_" + unit
-	if d.Cumulative {
+	if d.Cumulative && d.Kind != metrics.KindFloat64Histogram {
 		name = name + "_total"
 	}
 
@@ -84,12 +84,12 @@ func RuntimeMetricsToProm(d *metrics.Description) (string, string, string, bool)
 func RuntimeMetricsBucketsForUnit(buckets []float64, unit string) []float64 {
 	switch unit {
 	case "bytes":
-		// Rebucket as powers of 2.
-		return rebucketExp(buckets, 2)
+		// Re-bucket as powers of 2.
+		return reBucketExp(buckets, 2)
 	case "seconds":
-		// Rebucket as powers of 10 and then merge all buckets greater
+		// Re-bucket as powers of 10 and then merge all buckets greater
 		// than 1 second into the +Inf bucket.
-		b := rebucketExp(buckets, 10)
+		b := reBucketExp(buckets, 10)
 		for i := range b {
 			if b[i] <= 1 {
 				continue
@@ -103,11 +103,11 @@ func RuntimeMetricsBucketsForUnit(buckets []float64, unit string) []float64 {
 	return buckets
 }
 
-// rebucketExp takes a list of bucket boundaries (lower bound inclusive) and
+// reBucketExp takes a list of bucket boundaries (lower bound inclusive) and
 // downsamples the buckets to those a multiple of base apart. The end result
 // is a roughly exponential (in many cases, perfectly exponential) bucketing
 // scheme.
-func rebucketExp(buckets []float64, base float64) []float64 {
+func reBucketExp(buckets []float64, base float64) []float64 {
 	bucket := buckets[0]
 	var newBuckets []float64
 	// We may see a -Inf here, in which case, add it and skip it