Adding upstream version 1.34.4.

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

plugins/inputs/linux_sysctl_fs/linux_sysctl_fs.go

@@ -0,0 +1,109 @@
+//go:generate ../../../tools/readme_config_includer/generator
+package linux_sysctl_fs
+
+import (
+	"bytes"
+	_ "embed"
+	"errors"
+	"os"
+	"path"
+	"strconv"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/internal"
+	"github.com/influxdata/telegraf/plugins/inputs"
+)
+
+//go:embed sample.conf
+var sampleConfig string
+
+// https://www.kernel.org/doc/Documentation/sysctl/fs.txt
+type SysctlFS struct {
+	path string
+}
+
+func (*SysctlFS) SampleConfig() string {
+	return sampleConfig
+}
+
+func (sfs *SysctlFS) Gather(acc telegraf.Accumulator) error {
+	fields := make(map[string]interface{})
+
+	for _, n := range []string{"aio-nr", "aio-max-nr", "dquot-nr", "dquot-max", "super-nr", "super-max"} {
+		if err := sfs.gatherOne(n, fields); err != nil {
+			return err
+		}
+	}
+
+	err := sfs.gatherList("inode-state", fields, "inode-nr", "inode-free-nr", "inode-preshrink-nr")
+	if err != nil {
+		return err
+	}
+	err = sfs.gatherList("dentry-state", fields, "dentry-nr", "dentry-unused-nr", "dentry-age-limit", "dentry-want-pages")
+	if err != nil {
+		return err
+	}
+	err = sfs.gatherList("file-nr", fields, "file-nr", "", "file-max")
+	if err != nil {
+		return err
+	}
+
+	acc.AddFields("linux_sysctl_fs", fields, nil)
+	return nil
+}
+
+func (sfs *SysctlFS) gatherList(file string, fields map[string]interface{}, fieldNames ...string) error {
+	bs, err := os.ReadFile(sfs.path + "/" + file)
+	if err != nil {
+		// Ignore non-existing entries
+		if errors.Is(err, os.ErrNotExist) {
+			return nil
+		}
+		return err
+	}
+
+	bsplit := bytes.Split(bytes.TrimRight(bs, "\n"), []byte{'\t'})
+	for i, name := range fieldNames {
+		if i >= len(bsplit) {
+			break
+		}
+		if name == "" {
+			continue
+		}
+
+		v, err := strconv.ParseUint(string(bsplit[i]), 10, 64)
+		if err != nil {
+			return err
+		}
+		fields[name] = v
+	}
+
+	return nil
+}
+
+func (sfs *SysctlFS) gatherOne(name string, fields map[string]interface{}) error {
+	bs, err := os.ReadFile(sfs.path + "/" + name)
+	if err != nil {
+		// Ignore non-existing entries
+		if errors.Is(err, os.ErrNotExist) {
+			return nil
+		}
+		return err
+	}
+
+	v, err := strconv.ParseUint(string(bytes.TrimRight(bs, "\n")), 10, 64)
+	if err != nil {
+		return err
+	}
+
+	fields[name] = v
+	return nil
+}
+
+func init() {
+	inputs.Add("linux_sysctl_fs", func() telegraf.Input {
+		return &SysctlFS{
+			path: path.Join(internal.GetProcPath(), "/sys/fs"),
+		}
+	})
+}