go.d add dmcache collector (#17947)

14 files changed, 925 insertions, 0 deletions

diff --git a/src/go/collectors/go.d.plugin/README.md b/src/go/collectors/go.d.plugin/README.md
index 0012b94143..5100e518c3 100644
--- a/src/go/collectors/go.d.plugin/README.md
+++ b/src/go/collectors/go.d.plugin/README.md
@@ -61,6 +61,7 @@ see the appropriate collector readme.
 | [coredns](https://github.com/netdata/netdata/tree/master/src/go/collectors/go.d.plugin/modules/coredns)                       |            CoreDNS            |
 | [couchbase](https://github.com/netdata/netdata/tree/master/src/go/collectors/go.d.plugin/modules/couchbase)                   |           Couchbase           |
 | [couchdb](https://github.com/netdata/netdata/tree/master/src/go/collectors/go.d.plugin/modules/couchdb)                       |            CouchDB            |
+| [dmcache](https://github.com/netdata/netdata/tree/master/src/go/collectors/go.d.plugin/modules/dmcache)                       |            DMCache            |
 | [dnsdist](https://github.com/netdata/netdata/tree/master/src/go/collectors/go.d.plugin/modules/dnsdist)                       |            Dnsdist            |
 | [dnsmasq](https://github.com/netdata/netdata/tree/master/src/go/collectors/go.d.plugin/modules/dnsmasq)                       |     Dnsmasq DNS Forwarder     |
 | [dnsmasq_dhcp](https://github.com/netdata/netdata/tree/master/src/go/collectors/go.d.plugin/modules/dnsmasq_dhcp)             |         Dnsmasq DHCP          |
diff --git a/src/go/collectors/go.d.plugin/config/go.d.conf b/src/go/collectors/go.d.plugin/config/go.d.conf
index 4d3ce150a5..8a5ac82ec4 100644
--- a/src/go/collectors/go.d.plugin/config/go.d.conf
+++ b/src/go/collectors/go.d.plugin/config/go.d.conf
@@ -26,6 +26,7 @@ modules:
 #  coredns: yes
 #  couchbase: yes
 #  couchdb: yes
+#  dmcache: yes
 #  dnsdist: yes
 #  dnsmasq: yes
 #  dnsmasq_dhcp: yes
diff --git a/src/go/collectors/go.d.plugin/config/go.d/dmcache.conf b/src/go/collectors/go.d.plugin/config/go.d/dmcache.conf
new file mode 100644
index 0000000000..a17e6db79a
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/config/go.d/dmcache.conf
@@ -0,0 +1,5 @@
+## All available configuration options, their descriptions and default values:
+## https://github.com/netdata/netdata/tree/master/src/go/collectors/go.d.plugin/modules/dmcache#readme
+
+jobs:
+  - name: dmcache
diff --git a/src/go/collectors/go.d.plugin/modules/dmcache/charts.go b/src/go/collectors/go.d.plugin/modules/dmcache/charts.go
new file mode 100644
index 0000000000..0f57d40a5b
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/dmcache/charts.go
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package dmcache
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/netdata/netdata/go/go.d.plugin/agent/module"
+)
+
+const (
+	prioDeviceCacheSpaceUsage = module.Priority + iota
+	prioDeviceMetaSpaceUsage
+	prioDeviceReadEfficiency
+	prioDeviceWriteEfficiency
+	prioDeviceActivity
+	prioDeviceDirty
+)
+
+var deviceChartsTmpl = module.Charts{
+	chartDeviceCacheSpaceUsageTmpl.Copy(),
+	chartDeviceMetadataSpaceUsageTmpl.Copy(),
+
+	chartDeviceReadEfficiencyTmpl.Copy(),
+	chartDeviceWriteEfficiencyTmpl.Copy(),
+
+	chartDeviceActivityTmpl.Copy(),
+
+	chartDeviceDirtySizeTmpl.Copy(),
+}
+
+var (
+	chartDeviceCacheSpaceUsageTmpl = module.Chart{
+		ID:       "dmcache_device_%s_cache_space_usage",
+		Title:    "DMCache space usage",
+		Units:    "bytes",
+		Fam:      "space usage",
+		Ctx:      "dmcache.device_cache_space_usage",
+		Type:     module.Stacked,
+		Priority: prioDeviceCacheSpaceUsage,
+		Dims: module.Dims{
+			{ID: "dmcache_device_%s_cache_free_bytes", Name: "free"},
+			{ID: "dmcache_device_%s_cache_used_bytes", Name: "used"},
+		},
+	}
+	chartDeviceMetadataSpaceUsageTmpl = module.Chart{
+		ID:       "dmcache_device_%s_metadata_space_usage",
+		Title:    "DMCache metadata space usage",
+		Units:    "bytes",
+		Fam:      "space usage",
+		Ctx:      "dmcache.device_metadata_space_usage",
+		Type:     module.Stacked,
+		Priority: prioDeviceMetaSpaceUsage,
+		Dims: module.Dims{
+			{ID: "dmcache_device_%s_metadata_free_bytes", Name: "free"},
+			{ID: "dmcache_device_%s_metadata_used_bytes", Name: "used"},
+		},
+	}
+)
+
+var (
+	chartDeviceReadEfficiencyTmpl = module.Chart{
+		ID:       "dmcache_device_%s_read_efficiency",
+		Title:    "DMCache read efficiency",
+		Units:    "requests/s",
+		Fam:      "efficiency",
+		Ctx:      "dmcache.device_cache_read_efficiency",
+		Type:     module.Stacked,
+		Priority: prioDeviceReadEfficiency,
+		Dims: module.Dims{
+			{ID: "dmcache_device_%s_read_hits", Name: "hits", Algo: module.Incremental},
+			{ID: "dmcache_device_%s_read_misses", Name: "misses", Algo: module.Incremental},
+		},
+	}
+	chartDeviceWriteEfficiencyTmpl = module.Chart{
+		ID:       "dmcache_device_%s_write_efficiency",
+		Title:    "DMCache write efficiency",
+		Units:    "requests/s",
+		Fam:      "efficiency",
+		Ctx:      "dmcache.device_cache_write_efficiency",
+		Type:     module.Stacked,
+		Priority: prioDeviceWriteEfficiency,
+		Dims: module.Dims{
+			{ID: "dmcache_device_%s_write_hits", Name: "hits", Algo: module.Incremental},
+			{ID: "dmcache_device_%s_write_misses", Name: "misses", Algo: module.Incremental},
+		},
+	}
+)
+
+var chartDeviceActivityTmpl = module.Chart{
+	ID:       "dmcache_device_%s_activity",
+	Title:    "DMCache activity",
+	Units:    "bytes/s",
+	Fam:      "activity",
+	Ctx:      "dmcache.device_cache_activity",
+	Type:     module.Area,
+	Priority: prioDeviceActivity,
+	Dims: module.Dims{
+		{ID: "dmcache_device_%s_promotions_bytes", Name: "promotions", Algo: module.Incremental},
+		{ID: "dmcache_device_%s_demotions_bytes", Name: "demotions", Mul: -1, Algo: module.Incremental},
+	},
+}
+
+var chartDeviceDirtySizeTmpl = module.Chart{
+	ID:       "dmcache_device_%s_dirty_size",
+	Title:    "DMCache dirty data size",
+	Units:    "bytes",
+	Fam:      "dirty size",
+	Ctx:      "dmcache.device_cache_dirty_size",
+	Type:     module.Area,
+	Priority: prioDeviceDirty,
+	Dims: module.Dims{
+		{ID: "dmcache_device_%s_dirty_bytes", Name: "dirty"},
+	},
+}
+
+func (c *DmCache) addDeviceCharts(device string) {
+	charts := deviceChartsTmpl.Copy()
+
+	for _, chart := range *charts {
+		chart.ID = fmt.Sprintf(chart.ID, cleanDeviceName(device))
+		chart.Labels = []module.Label{
+			{Key: "device", Value: device},
+		}
+		for _, dim := range chart.Dims {
+			dim.ID = fmt.Sprintf(dim.ID, device)
+		}
+	}
+
+	if err := c.Charts().Add(*charts...); err != nil {
+		c.Warning(err)
+	}
+}
+
+func (c *DmCache) removeDeviceCharts(device string) {
+	px := fmt.Sprintf("dmcache_device_%s_", cleanDeviceName(device))
+
+	for _, chart := range *c.Charts() {
+		if strings.HasPrefix(chart.ID, px) {
+			chart.MarkRemove()
+			chart.MarkNotCreated()
+		}
+	}
+}
+
+func cleanDeviceName(device string) string {
+	return strings.ReplaceAll(device, ".", "_")
+}
diff --git a/src/go/collectors/go.d.plugin/modules/dmcache/collect.go b/src/go/collectors/go.d.plugin/modules/dmcache/collect.go
new file mode 100644
index 0000000000..eae961b73b
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/dmcache/collect.go
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package dmcache
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+type dmCacheDevice struct {
+	name                  string
+	metaBlockSizeSectors  int64
+	metaUsedBlocks        int64
+	metaTotalBlocks       int64
+	cacheBlockSizeSectors int64
+	cacheUsedBlocks       int64
+	cacheTotalBlocks      int64
+	readHits              int64
+	readMisses            int64
+	writeHits             int64
+	writeMisses           int64
+	demotionsBlocks       int64
+	promotionsBlocks      int64
+	dirtyBlocks           int64
+}
+
+func (c *DmCache) collect() (map[string]int64, error) {
+	bs, err := c.exec.cacheStatus()
+	if err != nil {
+		return nil, err
+	}
+
+	mx := make(map[string]int64)
+
+	if err := c.collectCacheStatus(mx, bs); err != nil {
+		return nil, err
+	}
+
+	return mx, nil
+}
+
+func (c *DmCache) collectCacheStatus(mx map[string]int64, data []byte) error {
+	var devices []*dmCacheDevice
+
+	sc := bufio.NewScanner(bytes.NewReader(data))
+
+	for sc.Scan() {
+		line := strings.TrimSpace(sc.Text())
+		if line == "" {
+			continue
+		}
+
+		dev, err := parseDmsetupStatusLine(line)
+		if err != nil {
+			return fmt.Errorf("malformed dmsetup status line: %v ('%s')", err, line)
+		}
+
+		devices = append(devices, dev)
+	}
+
+	seen := make(map[string]bool)
+
+	for _, dev := range devices {
+		seen[dev.name] = true
+
+		if !c.devices[dev.name] {
+			c.devices[dev.name] = true
+			c.addDeviceCharts(dev.name)
+		}
+
+		px := fmt.Sprintf("dmcache_device_%s_", dev.name)
+
+		const sectorSize = 512
+		metaMul := dev.metaBlockSizeSectors * sectorSize
+		cacheMul := dev.cacheBlockSizeSectors * sectorSize
+
+		mx[px+"metadata_free_bytes"] = (dev.metaTotalBlocks - dev.metaUsedBlocks) * metaMul
+		mx[px+"metadata_used_bytes"] = dev.metaUsedBlocks * metaMul
+		mx[px+"cache_free_bytes"] = (dev.cacheTotalBlocks - dev.cacheUsedBlocks) * cacheMul
+		mx[px+"cache_used_bytes"] = dev.cacheUsedBlocks * cacheMul
+		mx[px+"read_hits"] = dev.readHits
+		mx[px+"read_misses"] = dev.readMisses
+		mx[px+"write_hits"] = dev.writeHits
+		mx[px+"write_misses"] = dev.writeMisses
+		mx[px+"demotions_bytes"] = dev.demotionsBlocks * cacheMul
+		mx[px+"promotions_bytes"] = dev.promotionsBlocks * cacheMul
+		mx[px+"dirty_bytes"] = dev.dirtyBlocks * cacheMul
+	}
+
+	for dev := range c.devices {
+		if !seen[dev] {
+			delete(c.devices, dev)
+			c.removeDeviceCharts(dev)
+		}
+	}
+
+	if len(devices) == 0 {
+		return errors.New("no dm-cache devices found")
+	}
+
+	return nil
+}
+
+func parseDmsetupStatusLine(line string) (*dmCacheDevice, error) {
+	// https://www.kernel.org/doc/html/next/admin-guide/device-mapper/cache.html#status
+
+	parts := strings.Fields(line)
+	if len(parts) < 15 {
+		return nil, fmt.Errorf("want at least 15 fields, got %d", len(parts))
+	}
+
+	var dev dmCacheDevice
+	var err error
+
+	for i, s := range parts {
+		switch i {
+		case 0:
+			dev.name = strings.TrimSuffix(parts[0], ":")
+		case 4:
+			dev.metaBlockSizeSectors, err = parseInt(s)
+		case 5:
+			dev.metaUsedBlocks, dev.metaTotalBlocks, err = parseUsedTotalBlocks(s)
+		case 6:
+			dev.cacheBlockSizeSectors, err = parseInt(s)
+		case 7:
+			dev.cacheUsedBlocks, dev.cacheTotalBlocks, err = parseUsedTotalBlocks(s)
+		case 8:
+			dev.readHits, err = parseInt(s)
+		case 9:
+			dev.readMisses, err = parseInt(s)
+		case 10:
+			dev.writeHits, err = parseInt(s)
+		case 11:
+			dev.writeMisses, err = parseInt(s)
+		case 12:
+			dev.demotionsBlocks, err = parseInt(s)
+		case 13:
+			dev.promotionsBlocks, err = parseInt(s)
+		case 14:
+			dev.dirtyBlocks, err = parseInt(s)
+		}
+
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse %d field '%s': %v", i, s, err)
+		}
+	}
+
+	return &dev, nil
+}
+
+func parseUsedTotalBlocks(info string) (int64, int64, error) {
+	parts := strings.Split(info, "/")
+	if len(parts) != 2 {
+		return 0, 0, errors.New("expected used/total")
+	}
+	used, err := parseInt(parts[0])
+	if err != nil {
+		return 0, 0, err
+	}
+	total, err := parseInt(parts[1])
+	if err != nil {
+		return 0, 0, err
+	}
+	return used, total, nil
+}
+
+func parseInt(s string) (int64, error) {
+	return strconv.ParseInt(s, 10, 64)
+}
diff --git a/src/go/collectors/go.d.plugin/modules/dmcache/config_schema.json b/src/go/collectors/go.d.plugin/modules/dmcache/config_schema.json
new file mode 100644
index 0000000000..4428b4d1b3
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/dmcache/config_schema.json
@@ -0,0 +1,35 @@
+{
+  "jsonSchema": {
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "DMCache collector configuration.",
+    "type": "object",
+    "properties": {
+      "update_every": {
+        "title": "Update every",
+        "description": "Data collection interval, measured in seconds.",
+        "type": "integer",
+        "minimum": 1,
+        "default": 10
+      },
+      "timeout": {
+        "title": "Timeout",
+        "description": "Timeout for executing the binary, specified in seconds.",
+        "type": "number",
+        "minimum": 0.5,
+        "default": 2
+      }
+    },
+    "additionalProperties": false,
+    "patternProperties": {
+      "^name$": {}
+    }
+  },
+  "uiSchema": {
+    "uiOptions": {
+      "fullPage": true
+    },
+    "timeout": {
+      "ui:help": "Accepts decimals for precise control (e.g., type 1.5 for 1.5 seconds)."
+    }
+  }
+}
diff --git a/src/go/collectors/go.d.plugin/modules/dmcache/dmcache.go b/src/go/collectors/go.d.plugin/modules/dmcache/dmcache.go
new file mode 100644
index 0000000000..c7eb5ea1db
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/dmcache/dmcache.go
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package dmcache
+
+import (
+	_ "embed"
+	"errors"
+	"time"
+
+	"github.com/netdata/netdata/go/go.d.plugin/agent/module"
+	"github.com/netdata/netdata/go/go.d.plugin/pkg/web"
+)
+
+//go:embed "config_schema.json"
+var configSchema string
+
+func init() {
+	module.Register("dmcache", module.Creator{
+		JobConfigSchema: configSchema,
+		Defaults: module.Defaults{
+			UpdateEvery: 10,
+		},
+		Create: func() module.Module { return New() },
+		Config: func() any { return &Config{} },
+	})
+}
+
+func New() *DmCache {
+	return &DmCache{
+		Config: Config{
+			Timeout: web.Duration(time.Second * 2),
+		},
+		charts:  &module.Charts{},
+		devices: make(map[string]bool),
+	}
+}
+
+type Config struct {
+	UpdateEvery int          `yaml:"update_every,omitempty" json:"update_every"`
+	Timeout     web.Duration `yaml:"timeout,omitempty" json:"timeout"`
+}
+
+type (
+	DmCache struct {
+		module.Base
+		Config `yaml:",inline" json:""`
+
+		charts *module.Charts
+
+		exec dmsetupCLI
+
+		devices map[string]bool
+	}
+	dmsetupCLI interface {
+		cacheStatus() ([]byte, error)
+	}
+)
+
+func (c *DmCache) Configuration() any {
+	return c.Config
+}
+
+func (c *DmCache) Init() error {
+	dmsetup, err := c.initDmsetupCLI()
+	if err != nil {
+		c.Errorf("dmsetup exec initialization: %v", err)
+		return err
+	}
+	c.exec = dmsetup
+
+	return nil
+}
+
+func (c *DmCache) Check() error {
+	mx, err := c.collect()
+	if err != nil {
+		c.Error(err)
+		return err
+	}
+
+	if len(mx) == 0 {
+		return errors.New("no metrics collected")
+	}
+
+	return nil
+}
+
+func (c *DmCache) Charts() *module.Charts {
+	return c.charts
+}
+
+func (c *DmCache) Collect() map[string]int64 {
+	mx, err := c.collect()
+	if err != nil {
+		c.Error(err)
+	}
+
+	if len(mx) == 0 {
+		return nil
+	}
+
+	return mx
+}
+
+func (c *DmCache) Cleanup() {}
diff --git a/src/go/collectors/go.d.plugin/modules/dmcache/dmcache_test.go b/src/go/collectors/go.d.plugin/modules/dmcache/dmcache_test.go
new file mode 100644
index 0000000000..ef2de991a4
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/dmcache/dmcache_test.go
@@ -0,0 +1,253 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package dmcache
+
+import (
+	"errors"
+	"os"
+	"testing"
+
+	"github.com/netdata/netdata/go/go.d.plugin/agent/module"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+var (
+	dataConfigJSON, _ = os.ReadFile("testdata/config.json")
+	dataConfigYAML, _ = os.ReadFile("testdata/config.yaml")
+)
+
+func Test_testDataIsValid(t *testing.T) {
+	for name, data := range map[string][]byte{
+		"dataConfigJSON": dataConfigJSON,
+		"dataConfigYAML": dataConfigYAML,
+	} {
+		require.NotNil(t, data, name)
+
+	}
+}
+
+func TestDmCace_Configuration(t *testing.T) {
+	module.TestConfigurationSerialize(t, &DmCache{}, dataConfigJSON, dataConfigYAML)
+}
+
+func TestDmCache_Init(t *testing.T) {
+	tests := map[string]struct {
+		config   Config
+		wantFail bool
+	}{
+		"fails if failed to locate ndsudo": {
+			wantFail: true,
+			config:   New().Config,
+		},
+	}
+
+	for name, test := range tests {
+		t.Run(name, func(t *testing.T) {
+			lvm := New()
+			lvm.Config = test.config
+
+			if test.wantFail {
+				assert.Error(t, lvm.Init())
+			} else {
+				assert.NoError(t, lvm.Init())
+			}
+		})
+	}
+}
+
+func TestDmCache_Cleanup(t *testing.T) {
+	tests := map[string]struct {
+		prepare func() *DmCache
+	}{
+		"not initialized exec": {
+			prepare: func() *DmCache {
+				return New()
+			},
+		},
+		"after check": {
+			prepare: func() *DmCache {
+				lvm := New()
+				lvm.exec = prepareMockOK()
+				_ = lvm.Check()
+				return lvm
+			},
+		},
+		"after collect": {
+			prepare: func() *DmCache {
+				lvm := New()
+				lvm.exec = prepareMockOK()
+				_ = lvm.Collect()
+				return lvm
+			},
+		},
+	}
+
+	for name, test := range tests {
+		t.Run(name, func(t *testing.T) {
+			lvm := test.prepare()
+
+			assert.NotPanics(t, lvm.Cleanup)
+		})
+	}
+}
+
+func TestDmCache_Charts(t *testing.T) {
+	assert.NotNil(t, New().Charts())
+}
+
+func TestDmCache_Check(t *testing.T) {
+	tests := map[string]struct {
+		prepareMock func() *mockDmsetupExec
+		wantFail    bool
+	}{
+		"success case": {
+			prepareMock: prepareMockOK,
+			wantFail:    false,
+		},
+		"error on cache status": {
+			prepareMock: prepareMockErr,
+			wantFail:    true,
+		},
+		"empty response": {
+			prepareMock: prepareMockEmptyResponse,
+			wantFail:    true,
+		},
+		"unexpected response": {
+			prepareMock: prepareMockUnexpectedResponse,
+			wantFail:    true,
+		},
+	}
+
+	for name, test := range tests {
+		t.Run(name, func(t *testing.T) {
+			dmcache := New()
+			mock := test.prepareMock()
+			dmcache.exec = mock
+
+			if test.wantFail {
+				assert.Error(t, dmcache.Check())
+			} else {
+				assert.NoError(t, dmcache.Check())
+			}
+		})
+	}
+}
+
+func TestLVM_Collect(t *testing.T) {
+	tests := map[string]struct {
+		prepareMock func() *mockDmsetupExec
+		wantCharts  int
+		wantMetrics map[string]int64
+	}{
+		"success case": {
+			prepareMock: prepareMockOK,
+			wantCharts:  len(deviceChartsTmpl) * 2,
+			wantMetrics: map[string]int64{
+				"dmcache_device_vg_raid1_md21-media_cache_free_bytes":    1252402397184,
+				"dmcache_device_vg_raid1_md21-media_cache_used_bytes":    396412059648,
+				"dmcache_device_vg_raid1_md21-media_demotions_bytes":     0,
+				"dmcache_device_vg_raid1_md21-media_dirty_bytes":         0,
+				"dmcache_device_vg_raid1_md21-media_metadata_free_bytes": 32243712,
+				"dmcache_device_vg_raid1_md21-media_metadata_used_bytes": 9699328,
+				"dmcache_device_vg_raid1_md21-media_promotions_bytes":    48035266560,
+				"dmcache_device_vg_raid1_md21-media_read_hits":           82870357,
+				"dmcache_device_vg_raid1_md21-media_read_misses":         5499462,
+				"dmcache_device_vg_raid1_md21-media_write_hits":          26280342,
+				"dmcache_device_vg_raid1_md21-media_write_misses":        8017854,
+				"dmcache_device_vg_raid2_md22-media_cache_free_bytes":    1252402397184,
+				"dmcache_device_vg_raid2_md22-media_cache_used_bytes":    396412059648,
+				"dmcache_device_vg_raid2_md22-media_demotions_bytes":     0,
+				"dmcache_device_vg_raid2_md22-media_dirty_bytes":         0,
+				"dmcache_device_vg_raid2_md22-media_metadata_free_bytes": 32243712,
+				"dmcache_device_vg_raid2_md22-media_metadata_used_bytes": 9699328,
+				"dmcache_device_vg_raid2_md22-media_promotions_bytes":    48035266560,
+				"dmcache_device_vg_raid2_md22-media_read_hits":           82870357,
+				"dmcache_device_vg_raid2_md22-media_read_misses":         5499462,
+				"dmcache_device_vg_raid2_md22-media_write_hits":          26280342,
+				"dmcache_device_vg_raid2_md22-media_write_misses":        8017854,
+			},
+		},
+		"error on cache status": {
+			prepareMock: prepareMockErr,
+			wantMetrics: nil,
+		},
+		"empty response": {
+			prepareMock: prepareMockEmptyResponse,
+			wantMetrics: nil,
+		},
+		"unexpected response": {
+			prepareMock: prepareMockUnexpectedResponse,
+			wantMetrics: nil,
+		},
+	}
+
+	for name, test := range tests {
+		t.Run(name, func(t *testing.T) {
+			dmcache := New()
+			mock := test.prepareMock()
+			dmcache.exec = mock
+
+			mx := dmcache.Collect()
+
+			assert.Equal(t, test.wantMetrics, mx)
+			assert.Len(t, *dmcache.Charts(), test.wantCharts)
+			testMetricsHasAllChartsDims(t, dmcache, mx)
+		})
+	}
+}
+
+func testMetricsHasAllChartsDims(t *testing.T, dmcache *DmCache, mx map[string]int64) {
+	for _, chart := range *dmcache.Charts() {
+		if chart.Obsolete {
+			continue
+		}
+		for _, dim := range chart.Dims {
+			_, ok := mx[dim.ID]
+			assert.Truef(t, ok, "collected metrics has no data for dim '%s' chart '%s'", dim.ID, chart.ID)
+		}
+	}
+}
+
+func prepareMockOK() *mockDmsetupExec {
+	return &mockDmsetupExec{
+		cacheStatusData: []byte(`
+vg_raid1_md21-media: 0 2404139008 cache 8 2368/10240 4096 189024/786216 82870357 5499462 26280342 8017854 0 22905 0 3 metadata2 writethrough no_discard_passdown 2 migration_threshold 32768 mq 10 random_threshold 0 sequential_threshold 0 discard_promote_adjustment 0 read_promote_adjustment 0 write_promote_adjustment 0 rw - 
+vg_raid2_md22-media: 0 2404139008 cache 8 2368/10240 4096 189024/786216 82870357 5499462 26280342 8017854 0 22905 0 3 metadata2 writethrough no_discard_passdown 2 migration_threshold 32768 mq 10 random_threshold 0 sequential_threshold 0 discard_promote_adjustment 0 read_promote_adjustment 0 write_promote_adjustment 0 rw - 
+`),
+	}
+}
+
+func prepareMockErr() *mockDmsetupExec {
+	return &mockDmsetupExec{
+		errOnCacheStatus: true,
+	}
+}
+
+func prepareMockEmptyResponse() *mockDmsetupExec {
+	return &mockDmsetupExec{}
+}
+
+func prepareMockUnexpectedResponse() *mockDmsetupExec {
+	return &mockDmsetupExec{
+		cacheStatusData: []byte(`
+Lorem ipsum dolor sit amet, consectetur adipiscing elit.
+Nulla malesuada erat id magna mattis, eu viverra tellus rhoncus.
+Fusce et felis pulvinar, posuere sem non, porttitor eros.
+`),
+	}
+}
+
+type mockDmsetupExec struct {
+	errOnCacheStatus bool
+	cacheStatusData  []byte
+}
+
+func (m *mockDmsetupExec) cacheStatus() ([]byte, error) {
+	if m.errOnCacheStatus {
+		return nil, errors.New("mock.cacheStatus() error")
+	}
+
+	return m.cacheStatusData, nil
+}
diff --git a/src/go/collectors/go.d.plugin/modules/dmcache/exec.go b/src/go/collectors/go.d.plugin/modules/dmcache/exec.go
new file mode 100644
index 0000000000..9d860ffb83
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/dmcache/exec.go
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package dmcache
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"time"
+
+	"github.com/netdata/netdata/go/go.d.plugin/logger"
+)
+
+func newDmsetupExec(ndsudoPath string, timeout time.Duration, log *logger.Logger) *dmsetupExec {
+	return &dmsetupExec{
+		Logger:     log,
+		ndsudoPath: ndsudoPath,
+		timeout:    timeout,
+	}
+}
+
+type dmsetupExec struct {
+	*logger.Logger
+
+	ndsudoPath string
+	timeout    time.Duration
+}
+
+func (e *dmsetupExec) cacheStatus() ([]byte, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), e.timeout)
+	defer cancel()
+
+	cmd := exec.CommandContext(ctx, e.ndsudoPath, "dmsetup-status-cache")
+	e.Debugf("executing '%s'", cmd)
+
+	bs, err := cmd.Output()
+	if err != nil {
+		return nil, fmt.Errorf("error on '%s': %v", cmd, err)
+	}
+
+	return bs, nil
+}
diff --git a/src/go/collectors/go.d.plugin/modules/dmcache/init.go b/src/go/collectors/go.d.plugin/modules/dmcache/init.go
new file mode 100644
index 0000000000..888e278a45
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/dmcache/init.go
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package dmcache
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/netdata/netdata/go/go.d.plugin/agent/executable"
+)
+
+func (c *DmCache) initDmsetupCLI() (dmsetupCLI, error) {
+	ndsudoPath := filepath.Join(executable.Directory, "ndsudo")
+	if _, err := os.Stat(ndsudoPath); err != nil {
+		return nil, fmt.Errorf("ndsudo executable not found: %v", err)
+
+	}
+
+	dmsetup := newDmsetupExec(ndsudoPath, c.Timeout.Duration(), c.Logger)
+
+	return dmsetup, nil
+}
diff --git a/src/go/collectors/go.d.plugin/modules/dmcache/metadata.yaml b/src/go/collectors/go.d.plugin/modules/dmcache/metadata.yaml
new file mode 100644
index 0000000000..58d9e46217
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/dmcache/metadata.yaml
@@ -0,0 +1,131 @@
+plugin_name: go.d.plugin
+modules:
+  - meta:
+      id: collector-go.d.plugin-dmcache
+      plugin_name: go.d.plugin
+      module_name: dmcache
+      monitored_instance:
+        name: DMCache devices
+        link: ""
+        icon_filename: filesystem.svg
+        categories:
+          - data-collection.storage-mount-points-and-filesystems
+      keywords:
+        - dmcache
+      related_resources:
+        integrations:
+          list: []
+      info_provided_to_referring_integrations:
+        description: ""
+      most_popular: false
+    overview:
+      data_collection:
+        metrics_description: >
+          This collector monitors DMCache, providing insights into capacity usage, efficiency, and activity.
+          It relies on the [`dmsetup`](https://man7.org/linux/man-pages/man8/dmsetup.8.html) CLI tool but avoids directly executing the binary.
+          Instead, it utilizes `ndsudo`, a Netdata helper specifically designed to run privileged commands securely within the Netdata environment.
+          This approach eliminates the need to use `sudo`, improving security and potentially simplifying permission management.
+        method_description: ""
+      supported_platforms:
+        include: []
+        exclude: []
+      multi_instance: false
+      additional_permissions:
+        description: ""
+      default_behavior:
+        auto_detection:
+          description: ""
+        limits:
+          description: ""
+        performance_impact:
+          description: ""
+    setup:
+      prerequisites:
+        list: []
+      configuration:
+        file:
+          name: go.d/dmcache.conf
+        options:
+          description: |
+            The following options can be defined globally: update_every.
+          folding:
+            title: Config options
+            enabled: true
+          list:
+            - name: update_every
+              description: Data collection frequency.
+              default_value: 10
+              required: false
+            - name: timeout
+              description: dmsetup binary execution timeout.
+              default_value: 2
+              required: false
+        examples:
+          folding:
+            title: Config
+            enabled: true
+          list:
+            - name: Custom update_every
+              description: Allows you to override the default data collection interval.
+              config: |
+                jobs:
+                  - name: dmcache
+                    update_every: 5  # Collect DMCache statistics every 5 seconds
+    troubleshooting:
+      problems:
+        list: []
+    alerts: []
+    metrics:
+      folding:
+        title: Metrics
+        enabled: false
+      description: ""
+      availability: []
+      scopes:
+        - name: dmcache device
+          description: These metrics refer to the DMCache device.
+          labels: