Refactor default runtime metrics tests for Go collector so that default runtime metric set autogenerates (#1631)

* Enable autogeneration for default runtime metrics list in collectors tests according to Go version

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

* Adapt withDefaultRuntimeMetrics function to work regardless of the Go version

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

* Autogenerate go collector test for go1.23

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

* Modify gen_go_collector_set.go to please linter and regenerate files

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

* Simplify gen_go_collector_set.go logic by modifying func computeMetricsList

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

* Slight simplification of withDefaultRuntimeMetrics func

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

* Refactor withDefaultRuntimeMetrics with generated default runtime metrics subsets

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

---------

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

prometheus/collectors/gen_go_collector_set.go

@@ -78,17 +78,48 @@ func main() {
 	v := goVersion(gv.Segments()[1])
 	log.Printf("generating metrics for Go version %q", v)
 
-	descriptions := computeMetricsList()
+	descriptions := computeMetricsList(metrics.All())
 	groupedMetrics := groupMetrics(descriptions)
 
+	// Find default metrics.
+	var defaultRuntimeDesc []metrics.Description
+	for _, d := range metrics.All() {
+		if !internal.GoCollectorDefaultRuntimeMetrics.MatchString(d.Name) {
+			continue
+		}
+		defaultRuntimeDesc = append(defaultRuntimeDesc, d)
+	}
+
+	defaultRuntimeMetricsList := computeMetricsList(defaultRuntimeDesc)
+
+	onlyGCDefRuntimeMetricsList := []string{}
+	onlySchedDefRuntimeMetricsList := []string{}
+
+	for _, m := range defaultRuntimeMetricsList {
+		if strings.HasPrefix(m, "go_gc") {
+			onlyGCDefRuntimeMetricsList = append(onlyGCDefRuntimeMetricsList, m)
+		}
+		if strings.HasPrefix(m, "go_sched") {
+			onlySchedDefRuntimeMetricsList = append(onlySchedDefRuntimeMetricsList, m)
+		} else {
+			continue
+		}
+	}
+
 	// Generate code.
 	var buf bytes.Buffer
 	err = testFile.Execute(&buf, struct {
 		GoVersion                      goVersion
 		Groups                         []metricGroup
+		DefaultRuntimeMetricsList      []string
+		OnlyGCDefRuntimeMetricsList    []string
+		OnlySchedDefRuntimeMetricsList []string
 	}{
 		GoVersion:                      v,
 		Groups:                         groupedMetrics,
+		DefaultRuntimeMetricsList:      defaultRuntimeMetricsList,
+		OnlyGCDefRuntimeMetricsList:    onlyGCDefRuntimeMetricsList,
+		OnlySchedDefRuntimeMetricsList: onlySchedDefRuntimeMetricsList,
 	})
 	if err != nil {
 		log.Fatalf("executing template: %v", err)
@@ -107,9 +138,9 @@ func main() {
 	}
 }
 
-func computeMetricsList() []string {
+func computeMetricsList(descs []metrics.Description) []string {
 	var metricsList []string
-	for _, d := range metrics.All() {
+	for _, d := range descs {
 		if trans := rm2prom(d); trans != "" {
 			metricsList = append(metricsList, trans)
 		}
@@ -186,4 +217,22 @@ func {{ .Name }}() []string {
 	})
 }
 {{ end }}
+
+var (
+	defaultRuntimeMetrics = []string{
+		{{- range $metric := .DefaultRuntimeMetricsList }}
+			{{ $metric | printf "%q"}},
+		{{- end }}
+	}
+	onlyGCDefRuntimeMetrics = []string{
+		{{- range $metric := .OnlyGCDefRuntimeMetricsList }}
+			{{ $metric | printf "%q"}},
+		{{- end }}
+	}
+	onlySchedDefRuntimeMetrics = []string{
+		{{- range $metric := .OnlySchedDefRuntimeMetricsList }}
+			{{ $metric | printf "%q"}},
+		{{- end }}
+	}
+)
 `))

prometheus/collectors/go_collector_go120_test.go

@@ -16,8 +16,6 @@
 
 package collectors
 
-import "sort"
-
 func withAllMetrics() []string {
 	return withBaseMetrics([]string{
 		"go_cgo_go_to_c_calls_calls_total",
@@ -119,17 +117,12 @@ func withDebugMetrics() []string {
 	return withBaseMetrics([]string{})
 }
 
-var defaultRuntimeMetrics = []string{
+var (
+	defaultRuntimeMetrics = []string{
 		"go_sched_gomaxprocs_threads",
 	}
-
+	onlyGCDefRuntimeMetrics    = []string{}
-func withDefaultRuntimeMetrics(metricNames []string, withoutGC, withoutSched bool) []string {
+	onlySchedDefRuntimeMetrics = []string{
-	// If withoutSched is true, exclude "go_sched_gomaxprocs_threads".
+		"go_sched_gomaxprocs_threads",
-	if withoutSched {
-		return metricNames
-	}
-	metricNames = append(metricNames, defaultRuntimeMetrics...)
-	// sorting is required
-	sort.Strings(metricNames)
-	return metricNames
 	}
+)

prometheus/collectors/go_collector_go121_test.go

@@ -16,8 +16,6 @@
 
 package collectors
 
-import "sort"
-
 func withAllMetrics() []string {
 	return withBaseMetrics([]string{
 		"go_cgo_go_to_c_calls_calls_total",
@@ -172,27 +170,17 @@ func withDebugMetrics() []string {
 	})
 }
 
-var defaultRuntimeMetrics = []string{
+var (
+	defaultRuntimeMetrics = []string{
 		"go_gc_gogc_percent",
 		"go_gc_gomemlimit_bytes",
 		"go_sched_gomaxprocs_threads",
 	}
-
+	onlyGCDefRuntimeMetrics = []string{
-func withDefaultRuntimeMetrics(metricNames []string, withoutGC, withoutSched bool) []string {
+		"go_gc_gogc_percent",
-	if withoutGC && withoutSched {
+		"go_gc_gomemlimit_bytes",
-		// If both flags are true, return the metricNames as is.
-		return metricNames
-	} else if withoutGC && !withoutSched {
-		// If only withoutGC is true, include "go_sched_gomaxprocs_threads" only.
-		metricNames = append(metricNames, []string{"go_sched_gomaxprocs_threads"}...)
-	} else if withoutSched && !withoutGC {
-		// If only withoutSched is true, exclude "go_sched_gomaxprocs_threads".
-		metricNames = append(metricNames, []string{"go_gc_gogc_percent", "go_gc_gomemlimit_bytes"}...)
-	} else {
-		// If neither flag is true, use the default metrics.
-		metricNames = append(metricNames, defaultRuntimeMetrics...)
 	}
-	// sorting is required
+	onlySchedDefRuntimeMetrics = []string{
-	sort.Strings(metricNames)
+		"go_sched_gomaxprocs_threads",
-	return metricNames
 	}
+)

prometheus/collectors/go_collector_go122_test.go

@@ -16,8 +16,6 @@
 
 package collectors
 
-import "sort"
-
 func withAllMetrics() []string {
 	return withBaseMetrics([]string{
 		"go_cgo_go_to_c_calls_calls_total",
@@ -194,27 +192,17 @@ func withDebugMetrics() []string {
 	})
 }
 
-var defaultRuntimeMetrics = []string{
+var (
+	defaultRuntimeMetrics = []string{
 		"go_gc_gogc_percent",
 		"go_gc_gomemlimit_bytes",
 		"go_sched_gomaxprocs_threads",
 	}
-
+	onlyGCDefRuntimeMetrics = []string{
-func withDefaultRuntimeMetrics(metricNames []string, withoutGC, withoutSched bool) []string {
+		"go_gc_gogc_percent",
-	if withoutGC && withoutSched {
+		"go_gc_gomemlimit_bytes",
-		// If both flags are true, return the metricNames as is.
-		return metricNames
-	} else if withoutGC && !withoutSched {
-		// If only withoutGC is true, include "go_sched_gomaxprocs_threads" only.
-		metricNames = append(metricNames, []string{"go_sched_gomaxprocs_threads"}...)
-	} else if withoutSched && !withoutGC {
-		// If only withoutSched is true, exclude "go_sched_gomaxprocs_threads".
-		metricNames = append(metricNames, []string{"go_gc_gogc_percent", "go_gc_gomemlimit_bytes"}...)
-	} else {
-		// If neither flag is true, use the default metrics.
-		metricNames = append(metricNames, defaultRuntimeMetrics...)
 	}
-	// sorting is required
+	onlySchedDefRuntimeMetrics = []string{
-	sort.Strings(metricNames)
+		"go_sched_gomaxprocs_threads",
-	return metricNames
 	}
+)

prometheus/collectors/go_collector_go123_test.go

@@ -16,8 +16,6 @@
 
 package collectors
 
-import "sort"
-
 func withAllMetrics() []string {
 	return withBaseMetrics([]string{
 		"go_cgo_go_to_c_calls_calls_total",
@@ -206,27 +204,17 @@ func withDebugMetrics() []string {
 	})
 }
 
-var defaultRuntimeMetrics = []string{
+var (
+	defaultRuntimeMetrics = []string{
 		"go_gc_gogc_percent",
 		"go_gc_gomemlimit_bytes",
 		"go_sched_gomaxprocs_threads",
 	}
-
+	onlyGCDefRuntimeMetrics = []string{
-func withDefaultRuntimeMetrics(metricNames []string, withoutGC, withoutSched bool) []string {
+		"go_gc_gogc_percent",
-	if withoutGC && withoutSched {
+		"go_gc_gomemlimit_bytes",
-		// If both flags are true, return the metricNames as is.
-		return metricNames
-	} else if withoutGC && !withoutSched {
-		// If only withoutGC is true, include "go_sched_gomaxprocs_threads" only.
-		metricNames = append(metricNames, []string{"go_sched_gomaxprocs_threads"}...)
-	} else if withoutSched && !withoutGC {
-		// If only withoutSched is true, exclude "go_sched_gomaxprocs_threads".
-		metricNames = append(metricNames, []string{"go_gc_gogc_percent", "go_gc_gomemlimit_bytes"}...)
-	} else {
-		// If neither flag is true, use the default metrics.
-		metricNames = append(metricNames, defaultRuntimeMetrics...)
 	}
-	// sorting is required
+	onlySchedDefRuntimeMetrics = []string{
-	sort.Strings(metricNames)
+		"go_sched_gomaxprocs_threads",
-	return metricNames
 	}
+)

prometheus/collectors/go_collector_latest_test.go

@@ -62,6 +62,23 @@ var memstatMetrics = []string{
 	"go_memstats_sys_bytes",
 }
 
+func withDefaultRuntimeMetrics(metricNames []string, withoutGC, withoutSched bool) []string {
+	switch {
+	case withoutGC && !withoutSched:
+		// If only withoutGC is true, exclude "go_gc_*" metrics.
+		metricNames = append(metricNames, onlySchedDefRuntimeMetrics...)
+	case withoutSched && !withoutGC:
+		// If only withoutSched is true, exclude "go_sched_*" metrics.
+		metricNames = append(metricNames, onlyGCDefRuntimeMetrics...)
+	default:
+		// In any other case, use the default metrics.
+		metricNames = append(metricNames, defaultRuntimeMetrics...)
+	}
+	// sorting is required
+	sort.Strings(metricNames)
+	return metricNames
+}
+
 func TestGoCollectorMarshalling(t *testing.T) {
 	reg := prometheus.NewPedanticRegistry()
 	reg.MustRegister(NewGoCollector(