Go version expected default runtime metrics map for tests

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

prometheus/go_collector_latest_go120_test.go

@@ -0,0 +1,21 @@
+// Copyright 2024 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !go1.21
+// +build !go1.21
+
+package prometheus
+
+var expMetrics = map[string]string{
+	"/sched/gomaxprocs:threads": "go_sched_gomaxprocs_threads",
+}

prometheus/go_collector_latest_go121_test.go

@@ -0,0 +1,23 @@
+// Copyright 2024 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build go1.21
+// +build go1.21
+
+package prometheus
+
+var expMetrics = map[string]string{
+	"/gc/gogc:percent":          "go_gc_gogc_percent",
+	"/gc/gomemlimit:bytes":      "go_gc_gomemlimit_bytes",
+	"/sched/gomaxprocs:threads": "go_sched_gomaxprocs_threads",
+}

prometheus/go_collector_latest_test.go

@@ -75,11 +75,6 @@ func addExpectedRuntimeMetrics(metrics map[string]struct{}) map[string]struct{}
 }
 
 func addExpectedDefaultRuntimeMetrics(metrics map[string]struct{}) map[string]struct{} {
-	expMetrics := map[string]string{
-		"/gc/gogc:percent":          "go_gc_gogc_percent",
-		"/gc/gomemlimit:bytes":      "go_gc_gomemlimit_bytes",
-		"/sched/gomaxprocs:threads": "go_sched_gomaxprocs_threads",
-	}
 	for _, e := range expMetrics {
 		metrics[e] = struct{}{}
 	}