process: read processes from the kernel instead of perflib (#2644)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

internal/collector/process/process_test.go

@@ -18,11 +18,15 @@
 package process_test
 
 import (
+	"os"
+	"regexp"
+	"strconv"
 	"testing"
 
 	"github.com/alecthomas/kingpin/v2"
 	"github.com/prometheus-community/windows_exporter/internal/collector/process"
 	"github.com/prometheus-community/windows_exporter/internal/utils/testutils"
+	"github.com/stretchr/testify/require"
 )
 
 func BenchmarkProcessCollector(b *testing.B) {
@@ -37,3 +41,40 @@ func BenchmarkProcessCollector(b *testing.B) {
 func TestCollector(t *testing.T) {
 	testutils.TestCollector(t, process.New, nil)
 }
+
+func TestCollectorCurrentProcess(t *testing.T) {
+	config := process.ConfigDefaults
+	config.ProcessInclude = regexp.MustCompile(`^process\.test$`)
+
+	families := testutils.TestCollector(t, process.New, &config)
+	pid := strconv.Itoa(os.Getpid())
+
+	infos := families["windows_process_info"].GetMetric()
+	require.Len(t, infos, 1)
+
+	labels := map[string]string{}
+	for _, label := range infos[0].GetLabel() {
+		labels[label.GetName()] = label.GetValue()
+	}
+
+	require.Equal(t, "process.test", labels["process"])
+	require.Equal(t, pid, labels["process_id"])
+	require.Equal(t, strconv.Itoa(os.Getppid()), labels["creating_process_id"])
+	require.NotEmpty(t, labels["owner"])
+	require.Contains(t, labels["cmdline"], "process.test")
+
+	for _, name := range []string{
+		"windows_process_start_time_seconds_timestamp",
+		"windows_process_handles",
+		"windows_process_threads",
+		"windows_process_virtual_bytes",
+		"windows_process_working_set_bytes",
+		"windows_process_private_bytes",
+	} {
+		require.Positive(t, testutils.MetricValuesByLabel(families, name, "process_id")[pid], name)
+	}
+
+	cpu := families["windows_process_cpu_time_total"].GetMetric()
+	require.Len(t, cpu, 2)
+	require.NotNil(t, cpu[0].GetCounter())
+}