.circleci: Add config to test against go1.18 (#1006)

* Add config to test against go1.18

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

* Try to fix circleci

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

.circleci/config.yml

@@ -1,6 +1,6 @@
 version: 2.1
 orbs:
-  go: circleci/go@0.2.0
+  go: circleci/go@1.7.1
   prometheus: prometheus/prometheus@0.16.0
 jobs:
   test:
@@ -17,8 +17,7 @@ jobs:
         type: boolean
         default: true
     docker:
-      - image: circleci/golang:<< parameters.go_version >>
-    working_directory: /go/src/github.com/prometheus/client_golang
+      - image: cimg/go:<< parameters.go_version >>
     steps:
       - checkout
       - when:
@@ -59,4 +58,10 @@ workflows:
           name: go-1-17
           go_version: "1.17"
           run_lint: true
+      - test:
+          name: go-1-18
+          go_version: "1.18"
+          run_lint: true
+          # Style and unused/missing packages are only checked against
+          # the latest supported Go version.
           run_style_and_unused: true

.github/workflows/golangci-lint.yml

@@ -20,6 +20,7 @@ jobs:
       - name: install Go
         uses: actions/setup-go@v2
         with:
+          # golangci-lint is not read for Go 1.18 (https://github.com/golangci/golangci-lint/issues/2649)
           go-version: 1.17.x
       - name: Lint
         uses: golangci/golangci-lint-action@v3.1.0

prometheus/gen_go_collector_metrics_set.go

@@ -38,8 +38,10 @@ func main() {
 		log.Fatal("requires Go version (e.g. go1.17) as an argument")
 	}
 	toolVersion := runtime.Version()
-	if majorVersion := toolVersion[:strings.LastIndexByte(toolVersion, '.')]; majorVersion != os.Args[1] {
-		log.Fatalf("using Go version %q but expected Go version %q", majorVersion, os.Args[1])
+	mtv := majorVersion(toolVersion)
+	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])
 	if err != nil {
@@ -93,6 +95,10 @@ func parseVersion(s string) (goVersion, error) {
 	return goVersion(i), err
 }
 
+func majorVersion(v string) string {
+	return v[:strings.LastIndexByte(v, '.')]
+}
+
 func rmCardinality() int {
 	cardinality := 0
 

prometheus/go_collector_metrics_go118_test.go

@@ -0,0 +1,41 @@
+// Code generated by gen_go_collector_metrics_set.go; DO NOT EDIT.
+//go:generate go run gen_go_collector_metrics_set.go go1.18
+
+//go:build go1.18 && !go1.19
+// +build go1.18,!go1.19
+
+package prometheus
+
+var expectedRuntimeMetrics = map[string]string{
+	"/gc/cycles/automatic:gc-cycles":              "go_gc_cycles_automatic_gc_cycles_total",
+	"/gc/cycles/forced:gc-cycles":                 "go_gc_cycles_forced_gc_cycles_total",
+	"/gc/cycles/total:gc-cycles":                  "go_gc_cycles_total_gc_cycles_total",
+	"/gc/heap/allocs-by-size:bytes":               "go_gc_heap_allocs_by_size_bytes_total",
+	"/gc/heap/allocs:bytes":                       "go_gc_heap_allocs_bytes_total",
+	"/gc/heap/allocs:objects":                     "go_gc_heap_allocs_objects_total",
+	"/gc/heap/frees-by-size:bytes":                "go_gc_heap_frees_by_size_bytes_total",
+	"/gc/heap/frees:bytes":                        "go_gc_heap_frees_bytes_total",
+	"/gc/heap/frees:objects":                      "go_gc_heap_frees_objects_total",
+	"/gc/heap/goal:bytes":                         "go_gc_heap_goal_bytes",
+	"/gc/heap/objects:objects":                    "go_gc_heap_objects_objects",
+	"/gc/heap/tiny/allocs:objects":                "go_gc_heap_tiny_allocs_objects_total",
+	"/gc/pauses:seconds":                          "go_gc_pauses_seconds_total",
+	"/memory/classes/heap/free:bytes":             "go_memory_classes_heap_free_bytes",
+	"/memory/classes/heap/objects:bytes":          "go_memory_classes_heap_objects_bytes",
+	"/memory/classes/heap/released:bytes":         "go_memory_classes_heap_released_bytes",
+	"/memory/classes/heap/stacks:bytes":           "go_memory_classes_heap_stacks_bytes",
+	"/memory/classes/heap/unused:bytes":           "go_memory_classes_heap_unused_bytes",
+	"/memory/classes/metadata/mcache/free:bytes":  "go_memory_classes_metadata_mcache_free_bytes",
+	"/memory/classes/metadata/mcache/inuse:bytes": "go_memory_classes_metadata_mcache_inuse_bytes",
+	"/memory/classes/metadata/mspan/free:bytes":   "go_memory_classes_metadata_mspan_free_bytes",
+	"/memory/classes/metadata/mspan/inuse:bytes":  "go_memory_classes_metadata_mspan_inuse_bytes",
+	"/memory/classes/metadata/other:bytes":        "go_memory_classes_metadata_other_bytes",
+	"/memory/classes/os-stacks:bytes":             "go_memory_classes_os_stacks_bytes",
+	"/memory/classes/other:bytes":                 "go_memory_classes_other_bytes",
+	"/memory/classes/profiling/buckets:bytes":     "go_memory_classes_profiling_buckets_bytes",
+	"/memory/classes/total:bytes":                 "go_memory_classes_total_bytes",
+	"/sched/goroutines:goroutines":                "go_sched_goroutines_goroutines",
+	"/sched/latencies:seconds":                    "go_sched_latencies_seconds",
+}
+
+const expectedRuntimeMetricsCardinality = 79