Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/inputs/kernel_vmstat/kernel_vmstat.go

@@ -0,0 +1,77 @@
+//go:generate ../../../tools/readme_config_includer/generator
+//go:build linux
+
+package kernel_vmstat
+
+import (
+	"bytes"
+	_ "embed"
+	"fmt"
+	"os"
+	"strconv"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/inputs"
+)
+
+//go:embed sample.conf
+var sampleConfig string
+
+type KernelVmstat struct {
+	statFile string
+}
+
+func (*KernelVmstat) SampleConfig() string {
+	return sampleConfig
+}
+
+func (k *KernelVmstat) Gather(acc telegraf.Accumulator) error {
+	data, err := k.getProcVmstat()
+	if err != nil {
+		return err
+	}
+
+	fields := make(map[string]interface{})
+
+	dataFields := bytes.Fields(data)
+	for i, field := range dataFields {
+		// dataFields is an array of {"stat1_name", "stat1_value", "stat2_name",
+		// "stat2_value", ...}
+		// We only want the even number index as that contain the stat name.
+		if i%2 == 0 {
+			// Convert the stat value into an integer.
+			m, err := strconv.ParseInt(string(dataFields[i+1]), 10, 64)
+			if err != nil {
+				return err
+			}
+
+			fields[string(field)] = m
+		}
+	}
+
+	acc.AddFields("kernel_vmstat", fields, make(map[string]string))
+	return nil
+}
+
+func (k *KernelVmstat) getProcVmstat() ([]byte, error) {
+	if _, err := os.Stat(k.statFile); os.IsNotExist(err) {
+		return nil, fmt.Errorf("kernel_vmstat: %s does not exist", k.statFile)
+	} else if err != nil {
+		return nil, err
+	}
+
+	data, err := os.ReadFile(k.statFile)
+	if err != nil {
+		return nil, err
+	}
+
+	return data, nil
+}
+
+func init() {
+	inputs.Add("kernel_vmstat", func() telegraf.Input {
+		return &KernelVmstat{
+			statFile: "/proc/vmstat",
+		}
+	})
+}