[receiver/kubeletstats] Add `k8s.{container,pod}.memory.node.utilizat…

…ion` metrics (#33591)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
Similar to
#32295
and
#33390,
this PR adds the `k8s.{container,pod}.memory.node.utilization` metrics.


**Link to tracking Issue:** <Issue number if applicable>
#27885

**Testing:** <Describe what testing was performed and which tests were
added.> Added unit test.

**Documentation:** <Describe the documentation added.> Added

### Manual testing

1. Using the following target Pod:
```yaml
apiVersion: v1
kind: Pod
metadata:
  name: memory-demo
spec:
  containers:
  - name: memory-demo-ctr
    image: polinux/stress
    resources:
      requests:
        memory: "8070591Ki"
      limits:
        memory: "9070591Ki"
    command: ["stress"]
    args: ["--vm", "1", "--vm-bytes", "800M", "--vm-hang", "4"]
```
2. 

![memGood](https://github.com/open-telemetry/opentelemetry-collector-contrib/assets/11754898/fae04b30-59ca-4d70-8446-f54b5a085cf7)

On a node of 32,5G memory the 800Mb container/Pod consumes the
`0.8/32.5=0.0246...=0.025`.

---------

Signed-off-by: ChrsMark <chrismarkou92@gmail.com>

.chloggen/add_utilization_k8s_node_metrics.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: kubeletstatsreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Add `k8s.pod.memory.node.utilization` and `k8s.container.memory.node.utilization` metrics"
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [33591]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

receiver/kubeletstatsreceiver/README.md

@@ -218,9 +218,10 @@ receivers:
       - pod
 ```
 
-### Collect k8s.container.cpu.node.utilization, `k8s.pod.cpu.node.utilization` as ratio of total node's capacity
+### Collect `k8s.{container,pod}.{cpu,memory}.node.utilization` as ratio of total node's capacity
 
-In order to calculate the `k8s.container.cpu.node.utilization` or `k8s.pod.cpu.node.utilization` metrics, the
+In order to calculate the `k8s.container.cpu.node.utilization`, `k8s.pod.cpu.node.utilization`,
+`k8s.container.memory.node.utilization` and `k8s.pod.memory.node.utilization` metrics, the
 information of the node's capacity must be retrieved from the k8s API. In this, the `k8s_api_config` needs to be set.
 In addition, the node name must be identified properly. The `K8S_NODE_NAME` env var can be set using the
 downward API inside the collector pod spec as follows:
@@ -248,6 +249,10 @@ receivers:
           enabled: true
         k8s.pod.cpu.node.utilization:
           enabled: true
+        k8s.container.memory.node.utilization:
+          enabled: true
+        k8s.pod.memory.node.utilization:
+          enabled: true
 ```
 
 ### Optional parameters

receiver/kubeletstatsreceiver/config.go

@@ -120,10 +120,17 @@ func (cfg *Config) Unmarshal(componentParser *confmap.Conf) error {
 }
 
 func (cfg *Config) Validate() error {
-	if cfg.Metrics.K8sContainerCPUNodeUtilization.Enabled && cfg.NodeName == "" {
-		return errors.New("for k8s.container.cpu.node.utilization node setting is required. Check the readme on how to set the required setting")
-	} else if cfg.Metrics.K8sPodCPUNodeUtilization.Enabled && cfg.NodeName == "" {
-		return errors.New("for k8s.pod.cpu.node.utilization node setting is required. Check the readme on how to set the required setting")
+	if cfg.NodeName == "" {
+		switch {
+		case cfg.Metrics.K8sContainerCPUNodeUtilization.Enabled:
+			return errors.New("for k8s.container.cpu.node.utilization node setting is required. Check the readme on how to set the required setting")
+		case cfg.Metrics.K8sPodCPUNodeUtilization.Enabled:
+			return errors.New("for k8s.pod.cpu.node.utilization node setting is required. Check the readme on how to set the required setting")
+		case cfg.Metrics.K8sContainerMemoryNodeUtilization.Enabled:
+			return errors.New("for k8s.container.memory.node.utilization node setting is required. Check the readme on how to set the required setting")
+		case cfg.Metrics.K8sPodMemoryNodeUtilization.Enabled:
+			return errors.New("for k8s.pod.memory.node.utilization node setting is required. Check the readme on how to set the required setting")
+		}
 	}
 	return nil
 }

receiver/kubeletstatsreceiver/config_test.go

@@ -229,6 +229,62 @@ func TestLoadConfig(t *testing.T) {
 			},
 			expectedValidationErr: "for k8s.pod.cpu.node.utilization node setting is required. Check the readme on how to set the required setting",
 		},
+		{
+			id: component.NewIDWithName(metadata.Type, "container_memory_node_utilization"),
+			expected: &Config{
+				ControllerConfig: scraperhelper.ControllerConfig{
+					CollectionInterval: duration,
+					InitialDelay:       time.Second,
+				},
+				ClientConfig: kube.ClientConfig{
+					APIConfig: k8sconfig.APIConfig{
+						AuthType: "tls",
+					},
+				},
+				MetricGroupsToCollect: []kubelet.MetricGroup{
+					kubelet.ContainerMetricGroup,
+					kubelet.PodMetricGroup,
+					kubelet.NodeMetricGroup,
+				},
+				MetricsBuilderConfig: metadata.MetricsBuilderConfig{
+					Metrics: metadata.MetricsConfig{
+						K8sContainerMemoryNodeUtilization: metadata.MetricConfig{
+							Enabled: true,
+						},
+					},
+					ResourceAttributes: metadata.DefaultResourceAttributesConfig(),
+				},
+			},
+			expectedValidationErr: "for k8s.container.memory.node.utilization node setting is required. Check the readme on how to set the required setting",
+		},
+		{
+			id: component.NewIDWithName(metadata.Type, "pod_memory_node_utilization"),
+			expected: &Config{
+				ControllerConfig: scraperhelper.ControllerConfig{
+					CollectionInterval: duration,
+					InitialDelay:       time.Second,
+				},
+				ClientConfig: kube.ClientConfig{
+					APIConfig: k8sconfig.APIConfig{
+						AuthType: "tls",
+					},
+				},
+				MetricGroupsToCollect: []kubelet.MetricGroup{
+					kubelet.ContainerMetricGroup,
+					kubelet.PodMetricGroup,
+					kubelet.NodeMetricGroup,
+				},
+				MetricsBuilderConfig: metadata.MetricsBuilderConfig{
+					Metrics: metadata.MetricsConfig{
+						K8sPodMemoryNodeUtilization: metadata.MetricConfig{
+							Enabled: true,
+						},
+					},
+					ResourceAttributes: metadata.DefaultResourceAttributesConfig(),
+				},
+			},
+			expectedValidationErr: "for k8s.pod.memory.node.utilization node setting is required. Check the readme on how to set the required setting",
+		},
 	}
 
 	for _, tt := range tests {

receiver/kubeletstatsreceiver/documentation.md

@@ -426,6 +426,14 @@ Container cpu utilization as a ratio of the container's requests
 | ---- | ----------- | ---------- |
 | 1 | Gauge | Double |
 
+### k8s.container.memory.node.utilization
+
+Container memory utilization as a ratio of the node's capacity
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| 1 | Gauge | Double |
+
 ### k8s.container.memory_limit_utilization
 
 Container memory utilization as a ratio of the container's limits
@@ -490,6 +498,14 @@ Pod cpu utilization as a ratio of the pod's total container requests. If any con
 | ---- | ----------- | ---------- |
 | 1 | Gauge | Double |
 
+### k8s.pod.memory.node.utilization
+
+Pod memory utilization as a ratio of the node's capacity
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| 1 | Gauge | Double |
+
 ### k8s.pod.memory_limit_utilization
 
 Pod memory utilization as a ratio of the pod's total container limits. If any container is missing a limit the metric is not emitted.

receiver/kubeletstatsreceiver/internal/kubelet/accumulator.go

@@ -57,7 +57,7 @@ func (a *metricDataAccumulator) nodeStats(s stats.NodeStats) {
 	currentTime := pcommon.NewTimestampFromTime(a.time)
 	addUptimeMetric(a.mbs.NodeMetricsBuilder, metadata.NodeUptimeMetrics.Uptime, s.StartTime, currentTime)
 	addCPUMetrics(a.mbs.NodeMetricsBuilder, metadata.NodeCPUMetrics, s.CPU, currentTime, resources{}, 0)
-	addMemoryMetrics(a.mbs.NodeMetricsBuilder, metadata.NodeMemoryMetrics, s.Memory, currentTime, resources{})
+	addMemoryMetrics(a.mbs.NodeMetricsBuilder, metadata.NodeMemoryMetrics, s.Memory, currentTime, resources{}, 0)
 	addFilesystemMetrics(a.mbs.NodeMetricsBuilder, metadata.NodeFilesystemMetrics, s.Fs, currentTime)
 	addNetworkMetrics(a.mbs.NodeMetricsBuilder, metadata.NodeNetworkMetrics, s.Network, currentTime)
 	// todo s.Runtime.ImageFs
@@ -76,8 +76,8 @@ func (a *metricDataAccumulator) podStats(s stats.PodStats) {
 
 	currentTime := pcommon.NewTimestampFromTime(a.time)
 	addUptimeMetric(a.mbs.PodMetricsBuilder, metadata.PodUptimeMetrics.Uptime, s.StartTime, currentTime)
-	addCPUMetrics(a.mbs.PodMetricsBuilder, metadata.PodCPUMetrics, s.CPU, currentTime, a.metadata.podResources[s.PodRef.UID], a.metadata.cpuNodeLimit)
-	addMemoryMetrics(a.mbs.PodMetricsBuilder, metadata.PodMemoryMetrics, s.Memory, currentTime, a.metadata.podResources[s.PodRef.UID])
+	addCPUMetrics(a.mbs.PodMetricsBuilder, metadata.PodCPUMetrics, s.CPU, currentTime, a.metadata.podResources[s.PodRef.UID], a.metadata.nodeCapacity.CPUCapacity)
+	addMemoryMetrics(a.mbs.PodMetricsBuilder, metadata.PodMemoryMetrics, s.Memory, currentTime, a.metadata.podResources[s.PodRef.UID], a.metadata.nodeCapacity.MemoryCapacity)
 	addFilesystemMetrics(a.mbs.PodMetricsBuilder, metadata.PodFilesystemMetrics, s.EphemeralStorage, currentTime)
 	addNetworkMetrics(a.mbs.PodMetricsBuilder, metadata.PodNetworkMetrics, s.Network, currentTime)
 
@@ -110,8 +110,8 @@ func (a *metricDataAccumulator) containerStats(sPod stats.PodStats, s stats.Cont
 	currentTime := pcommon.NewTimestampFromTime(a.time)
 	resourceKey := sPod.PodRef.UID + s.Name
 	addUptimeMetric(a.mbs.ContainerMetricsBuilder, metadata.ContainerUptimeMetrics.Uptime, s.StartTime, currentTime)
-	addCPUMetrics(a.mbs.ContainerMetricsBuilder, metadata.ContainerCPUMetrics, s.CPU, currentTime, a.metadata.containerResources[resourceKey], a.metadata.cpuNodeLimit)
-	addMemoryMetrics(a.mbs.ContainerMetricsBuilder, metadata.ContainerMemoryMetrics, s.Memory, currentTime, a.metadata.containerResources[resourceKey])
+	addCPUMetrics(a.mbs.ContainerMetricsBuilder, metadata.ContainerCPUMetrics, s.CPU, currentTime, a.metadata.containerResources[resourceKey], a.metadata.nodeCapacity.CPUCapacity)
+	addMemoryMetrics(a.mbs.ContainerMetricsBuilder, metadata.ContainerMemoryMetrics, s.Memory, currentTime, a.metadata.containerResources[resourceKey], a.metadata.nodeCapacity.MemoryCapacity)
 	addFilesystemMetrics(a.mbs.ContainerMetricsBuilder, metadata.ContainerFilesystemMetrics, s.Rootfs, currentTime)
 
 	a.m = append(a.m, a.mbs.ContainerMetricsBuilder.Emit(

receiver/kubeletstatsreceiver/internal/kubelet/accumulator_test.go

@@ -53,7 +53,7 @@ func TestMetadataErrorCases(t *testing.T) {
 						},
 					},
 				},
-			}, NodeLimits{}, nil),
+			}, NodeCapacity{}, nil),
 			testScenario: func(acc metricDataAccumulator) {
 				now := metav1.Now()
 				podStats := stats.PodStats{
@@ -79,7 +79,7 @@ func TestMetadataErrorCases(t *testing.T) {
 			metricGroupsToCollect: map[MetricGroup]bool{
 				VolumeMetricGroup: true,
 			},
-			metadata: NewMetadata([]MetadataLabel{MetadataLabelVolumeType}, nil, NodeLimits{}, nil),
+			metadata: NewMetadata([]MetadataLabel{MetadataLabelVolumeType}, nil, NodeCapacity{}, nil),
 			testScenario: func(acc metricDataAccumulator) {
 				podStats := stats.PodStats{
 					PodRef: stats.PodReference{
@@ -121,7 +121,7 @@ func TestMetadataErrorCases(t *testing.T) {
 						},
 					},
 				},
-			}, NodeLimits{}, nil),
+			}, NodeCapacity{}, nil),
 			testScenario: func(acc metricDataAccumulator) {
 				podStats := stats.PodStats{
 					PodRef: stats.PodReference{
@@ -165,7 +165,7 @@ func TestMetadataErrorCases(t *testing.T) {
 						},
 					},
 				},
-			}, NodeLimits{}, nil),
+			}, NodeCapacity{}, nil),
 			detailedPVCLabelsSetterOverride: func(*metadata.ResourceBuilder, string, string, string) error {
 				// Mock failure cases.
 				return errors.New("")

receiver/kubeletstatsreceiver/internal/kubelet/mem.go

@@ -10,7 +10,13 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/kubeletstatsreceiver/internal/metadata"
 )
 
-func addMemoryMetrics(mb *metadata.MetricsBuilder, memoryMetrics metadata.MemoryMetrics, s *stats.MemoryStats, currentTime pcommon.Timestamp, r resources) {
+func addMemoryMetrics(
+	mb *metadata.MetricsBuilder,
+	memoryMetrics metadata.MemoryMetrics,
+	s *stats.MemoryStats,
+	currentTime pcommon.Timestamp,
+	r resources,
+	nodeMemoryLimit float64) {
 	if s == nil {
 		return
 	}
@@ -29,5 +35,8 @@ func addMemoryMetrics(mb *metadata.MetricsBuilder, memoryMetrics metadata.Memory
 		if r.memoryRequest > 0 {
 			memoryMetrics.RequestUtilization(mb, currentTime, float64(*s.UsageBytes)/float64(r.memoryRequest))
 		}
+		if nodeMemoryLimit > 0 {
+			memoryMetrics.NodeUtilization(mb, currentTime, float64(*s.UsageBytes)/nodeMemoryLimit)
+		}
 	}
 }

receiver/kubeletstatsreceiver/internal/kubelet/metadata.go

@@ -52,7 +52,7 @@ type Metadata struct {
 	DetailedPVCResourceSetter func(rb *metadata.ResourceBuilder, volCacheID, volumeClaim, namespace string) error
 	podResources              map[string]resources
 	containerResources        map[string]resources
-	cpuNodeLimit              float64
+	nodeCapacity              NodeCapacity
 }
 
 type resources struct {
@@ -62,9 +62,12 @@ type resources struct {
 	memoryLimit   int64
 }
 
-type NodeLimits struct {
-	Name              string
-	CPUNanoCoresLimit float64
+type NodeCapacity struct {
+	Name string
+	// node's CPU capacity in cores
+	CPUCapacity float64
+	// node's Memory capacity in bytes
+	MemoryCapacity float64
 }
 
 func getContainerResources(r *v1.ResourceRequirements) resources {
@@ -80,15 +83,15 @@ func getContainerResources(r *v1.ResourceRequirements) resources {
 	}
 }
 
-func NewMetadata(labels []MetadataLabel, podsMetadata *v1.PodList, nodeResourceLimits NodeLimits,
+func NewMetadata(labels []MetadataLabel, podsMetadata *v1.PodList, nodeCap NodeCapacity,
 	detailedPVCResourceSetter func(rb *metadata.ResourceBuilder, volCacheID, volumeClaim, namespace string) error) Metadata {
 	m := Metadata{
 		Labels:                    getLabelsMap(labels),
 		PodsMetadata:              podsMetadata,
 		DetailedPVCResourceSetter: detailedPVCResourceSetter,
 		podResources:              make(map[string]resources),
 		containerResources:        make(map[string]resources),
-		cpuNodeLimit:              nodeResourceLimits.CPUNanoCoresLimit,
+		nodeCapacity:              nodeCap,
 	}
 
 	if podsMetadata != nil {