Add k8s Pod volume metrics (#2319)

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

.chloggen/add_k8s_volume_metrics.yaml

@@ -0,0 +1,22 @@
+# Use this changelog template to create an entry for release notes.
+#
+# If your change doesn't affect end users you should instead start
+# your pull request title with [chore] or use the "Skip Changelog" label.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the area of concern in the attributes-registry, (e.g. http, cloud, db)
+component: k8s
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add k8s Pod Volume metrics
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+# The values here must be integers.
+issues: [1485]
+
+# (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:

docs/non-normative/k8s-migration.md

@@ -62,6 +62,7 @@ and one for disabling the old schema called `semconv.k8s.disableLegacy`. Then:
   - [K8s ResourceQuota metrics](#k8s-resourcequota-metrics)
   - [K8s Node condition metrics](#k8s-node-condition-metrics)
   - [K8s Filesystem metrics](#k8s-filesystem-metrics)
+  - [K8s Pod Volume metrics](#k8s-pod-volume-metrics)
 
 <!-- tocstop -->
 
@@ -396,3 +397,24 @@ The changes in their metrics are the following:
 | `container.filesystem.usage`        gauge                                               | `container.filesystem.usage`       updowncounter |
 
 <!-- prettier-ignore-end -->
+
+### K8s Pod Volume metrics
+
+The K8s Pod volume metrics implemented by the Collector and specifically the
+[k8scluster](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/v0.119.0/receiver/k8sclusterreceiver/documentation.md)
+receiver were introduced as semantic conventions in
+[#2319](https://github.com/open-telemetry/semantic-conventions/pull/2319).
+
+The changes in these metrics are the following:
+
+<!-- prettier-ignore-start -->
+
+| Old (Collector) ![changed](https://img.shields.io/badge/changed-orange?style=flat) | New                          |
+|------------------------------------------------------------------------------------|------------------------------|
+| `k8s.volume.available` | `k8s.pod.volume.available`   |
+| `k8s.volume.capacity` | `k8s.pod.volume.capacity`    |
+| `k8s.volume.inodes` | `k8s.pod.volume.inode.count` |
+| `k8s.volume.inodes.free` | `k8s.pod.volume.inode.free`  |
+| `k8s.volume.inodes.used` | `k8s.pod.volume.inode.used`  |
+
+<!-- prettier-ignore-start -->

docs/system/k8s-metrics.md

@@ -27,6 +27,12 @@ and therefore inherit its attributes, like `k8s.pod.name` and `k8s.pod.uid`.
   - [Metric: `k8s.pod.filesystem.available`](#metric-k8spodfilesystemavailable)
   - [Metric: `k8s.pod.filesystem.capacity`](#metric-k8spodfilesystemcapacity)
   - [Metric: `k8s.pod.filesystem.usage`](#metric-k8spodfilesystemusage)
+  - [Metric: `k8s.pod.volume.available`](#metric-k8spodvolumeavailable)
+  - [Metric: `k8s.pod.volume.capacity`](#metric-k8spodvolumecapacity)
+  - [Metric: `k8s.pod.volume.usage`](#metric-k8spodvolumeusage)
+  - [Metric: `k8s.pod.volume.inode.count`](#metric-k8spodvolumeinodecount)
+  - [Metric: `k8s.pod.volume.inode.used`](#metric-k8spodvolumeinodeused)
+  - [Metric: `k8s.pod.volume.inode.free`](#metric-k8spodvolumeinodefree)
 - [Container metrics](#container-metrics)
   - [Metric: `k8s.container.status.state`](#metric-k8scontainerstatusstate)
   - [Metric: `k8s.container.status.reason`](#metric-k8scontainerstatusreason)
@@ -355,6 +361,268 @@ of the Kubelet's stats API.
 <!-- END AUTOGENERATED TEXT -->
 <!-- endsemconv -->
 
+### Metric: `k8s.pod.volume.available`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.pod.volume.available -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-capture -->
+<!-- markdownlint-disable -->
+
+| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
+| -------- | --------------- | ----------- | -------------- | --------- | ------ |
+| `k8s.pod.volume.available` | UpDownCounter | `By` | Pod volume storage space available [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`k8s.pod`](/docs/registry/entities/k8s.md#k8s-pod) |
+
+**[1]:** This metric is derived from the
+[VolumeStats.AvailableBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#VolumeStats) field
+of the [PodStats](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats) of the
+Kubelet's stats API.
+
+| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
+|---|---|---|---|---|---|
+| [`k8s.volume.name`](/docs/registry/attributes/k8s.md) | string | The name of the K8s volume. | `volume0` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
+| [`k8s.volume.type`](/docs/registry/attributes/k8s.md) | string | The type of the K8s volume. | `emptyDir`; `persistentVolumeClaim` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
+
+---
+
+`k8s.volume.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
+
+| Value  | Description | Stability |
+|---|---|---|
+| `configMap` | A [configMap](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#configmap) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `downwardAPI` | A [downwardAPI](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#downwardapi) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `emptyDir` | An [emptyDir](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#emptydir) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `local` | A [local](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#local) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `persistentVolumeClaim` | A [persistentVolumeClaim](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#persistentvolumeclaim) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `secret` | A [secret](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#secret) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.pod.volume.capacity`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.pod.volume.capacity -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-capture -->
+<!-- markdownlint-disable -->
+
+| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
+| -------- | --------------- | ----------- | -------------- | --------- | ------ |
+| `k8s.pod.volume.capacity` | UpDownCounter | `By` | Pod volume total capacity [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`k8s.pod`](/docs/registry/entities/k8s.md#k8s-pod) |
+
+**[1]:** This metric is derived from the
+[VolumeStats.CapacityBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#VolumeStats) field
+of the [PodStats](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats) of the
+Kubelet's stats API.
+
+| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
+|---|---|---|---|---|---|
+| [`k8s.volume.name`](/docs/registry/attributes/k8s.md) | string | The name of the K8s volume. | `volume0` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
+| [`k8s.volume.type`](/docs/registry/attributes/k8s.md) | string | The type of the K8s volume. | `emptyDir`; `persistentVolumeClaim` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
+
+---
+
+`k8s.volume.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
+
+| Value  | Description | Stability |
+|---|---|---|
+| `configMap` | A [configMap](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#configmap) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `downwardAPI` | A [downwardAPI](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#downwardapi) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `emptyDir` | An [emptyDir](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#emptydir) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `local` | A [local](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#local) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `persistentVolumeClaim` | A [persistentVolumeClaim](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#persistentvolumeclaim) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `secret` | A [secret](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#secret) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.pod.volume.usage`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.pod.volume.usage -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-capture -->
+<!-- markdownlint-disable -->
+
+| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
+| -------- | --------------- | ----------- | -------------- | --------- | ------ |
+| `k8s.pod.volume.usage` | UpDownCounter | `By` | Pod volume usage [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`k8s.pod`](/docs/registry/entities/k8s.md#k8s-pod) |
+
+**[1]:** This may not equal capacity - available.
+
+This metric is derived from the
+[VolumeStats.UsedBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#VolumeStats) field
+of the [PodStats](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats) of the
+Kubelet's stats API.
+
+| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
+|---|---|---|---|---|---|
+| [`k8s.volume.name`](/docs/registry/attributes/k8s.md) | string | The name of the K8s volume. | `volume0` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
+| [`k8s.volume.type`](/docs/registry/attributes/k8s.md) | string | The type of the K8s volume. | `emptyDir`; `persistentVolumeClaim` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
+
+---
+
+`k8s.volume.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
+
+| Value  | Description | Stability |
+|---|---|---|
+| `configMap` | A [configMap](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#configmap) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `downwardAPI` | A [downwardAPI](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#downwardapi) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `emptyDir` | An [emptyDir](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#emptydir) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `local` | A [local](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#local) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `persistentVolumeClaim` | A [persistentVolumeClaim](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#persistentvolumeclaim) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `secret` | A [secret](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#secret) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.pod.volume.inode.count`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.pod.volume.inode.count -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-capture -->
+<!-- markdownlint-disable -->
+
+| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
+| -------- | --------------- | ----------- | -------------- | --------- | ------ |
+| `k8s.pod.volume.inode.count` | UpDownCounter | `{inode}` | The total inodes in the filesystem of the Pod's volume [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`k8s.pod`](/docs/registry/entities/k8s.md#k8s-pod) |
+
+**[1]:** This metric is derived from the
+[VolumeStats.Inodes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#VolumeStats) field
+of the [PodStats](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats) of the
+Kubelet's stats API.
+
+| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
+|---|---|---|---|---|---|
+| [`k8s.volume.name`](/docs/registry/attributes/k8s.md) | string | The name of the K8s volume. | `volume0` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
+| [`k8s.volume.type`](/docs/registry/attributes/k8s.md) | string | The type of the K8s volume. | `emptyDir`; `persistentVolumeClaim` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
+
+---
+
+`k8s.volume.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
+
+| Value  | Description | Stability |
+|---|---|---|
+| `configMap` | A [configMap](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#configmap) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `downwardAPI` | A [downwardAPI](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#downwardapi) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `emptyDir` | An [emptyDir](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#emptydir) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `local` | A [local](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#local) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `persistentVolumeClaim` | A [persistentVolumeClaim](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#persistentvolumeclaim) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `secret` | A [secret](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#secret) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.pod.volume.inode.used`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.pod.volume.inode.used -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-capture -->
+<!-- markdownlint-disable -->
+
+| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
+| -------- | --------------- | ----------- | -------------- | --------- | ------ |
+| `k8s.pod.volume.inode.used` | UpDownCounter | `{inode}` | The inodes used by the filesystem of the Pod's volume [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`k8s.pod`](/docs/registry/entities/k8s.md#k8s-pod) |
+
+**[1]:** This metric is derived from the
+[VolumeStats.InodesUsed](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#VolumeStats) field
+of the [PodStats](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats) of the
+Kubelet's stats API.
+
+This may not be equal to `inodes - free` because filesystem may share inodes with other filesystems.
+
+| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
+|---|---|---|---|---|---|
+| [`k8s.volume.name`](/docs/registry/attributes/k8s.md) | string | The name of the K8s volume. | `volume0` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
+| [`k8s.volume.type`](/docs/registry/attributes/k8s.md) | string | The type of the K8s volume. | `emptyDir`; `persistentVolumeClaim` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
+
+---
+
+`k8s.volume.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
+
+| Value  | Description | Stability |
+|---|---|---|
+| `configMap` | A [configMap](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#configmap) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `downwardAPI` | A [downwardAPI](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#downwardapi) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `emptyDir` | An [emptyDir](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#emptydir) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `local` | A [local](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#local) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `persistentVolumeClaim` | A [persistentVolumeClaim](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#persistentvolumeclaim) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `secret` | A [secret](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#secret) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.pod.volume.inode.free`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.pod.volume.inode.free -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-capture -->
+<!-- markdownlint-disable -->
+
+| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
+| -------- | --------------- | ----------- | -------------- | --------- | ------ |
+| `k8s.pod.volume.inode.free` | UpDownCounter | `{inode}` | The free inodes in the filesystem of the Pod's volume [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`k8s.pod`](/docs/registry/entities/k8s.md#k8s-pod) |
+
+**[1]:** This metric is derived from the
+[VolumeStats.InodesFree](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#VolumeStats) field
+of the [PodStats](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats) of the
+Kubelet's stats API.
+
+| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
+|---|---|---|---|---|---|
+| [`k8s.volume.name`](/docs/registry/attributes/k8s.md) | string | The name of the K8s volume. | `volume0` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
+| [`k8s.volume.type`](/docs/registry/attributes/k8s.md) | string | The type of the K8s volume. | `emptyDir`; `persistentVolumeClaim` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
+
+---
+
+`k8s.volume.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
+
+| Value  | Description | Stability |
+|---|---|---|
+| `configMap` | A [configMap](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#configmap) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `downwardAPI` | A [downwardAPI](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#downwardapi) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `emptyDir` | An [emptyDir](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#emptydir) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `local` | A [local](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#local) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `persistentVolumeClaim` | A [persistentVolumeClaim](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#persistentvolumeclaim) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+| `secret` | A [secret](https://v1-30.docs.kubernetes.io/docs/concepts/storage/volumes/#secret) volume | ![Development](https://img.shields.io/badge/-development-blue) |
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
 ## Container metrics
 
 **Description:** Container level metrics captured under the namespace `k8s.container`.

model/k8s/metrics.yaml

@@ -146,6 +146,144 @@ groups:
       of the [PodStats.EphemeralStorage](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats)
       of the Kubelet's stats API.
 
+  # k8s.pod.volume.* metrics
+  - id: metric.k8s.pod.volume.available
+    type: metric
+    metric_name: k8s.pod.volume.available
+    stability: development
+    annotations:
+      code_generation:
+        metric_value_type: int
+    brief: "Pod volume storage space available"
+    instrument: updowncounter
+    unit: "By"
+    entity_associations:
+      - k8s.pod
+    note: |
+      This metric is derived from the
+      [VolumeStats.AvailableBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#VolumeStats) field
+      of the [PodStats](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats) of the
+      Kubelet's stats API.
+    attributes:
+      - ref: k8s.volume.name
+        requirement_level: required
+      - ref: k8s.volume.type
+        requirement_level: recommended
+  - id: metric.k8s.pod.volume.capacity
+    type: metric
+    metric_name: k8s.pod.volume.capacity
+    stability: development
+    brief: "Pod volume total capacity"
+    instrument: updowncounter
+    annotations:
+      code_generation:
+        metric_value_type: int
+    unit: "By"
+    entity_associations:
+      - k8s.pod
+    note: |
+      This metric is derived from the
+      [VolumeStats.CapacityBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#VolumeStats) field
+      of the [PodStats](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats) of the
+      Kubelet's stats API.
+    attributes:
+      - ref: k8s.volume.name
+        requirement_level: required
+      - ref: k8s.volume.type
+        requirement_level: recommended
+  - id: metric.k8s.pod.volume.usage
+    type: metric
+    metric_name: k8s.pod.volume.usage
+    stability: development
+    brief: "Pod volume usage"
+    instrument: updowncounter
+    annotations:
+      code_generation:
+        metric_value_type: int
+    unit: "By"
+    entity_associations:
+      - k8s.pod
+    note: |
+      This may not equal capacity - available.
+
+      This metric is derived from the
+      [VolumeStats.UsedBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#VolumeStats) field
+      of the [PodStats](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats) of the
+      Kubelet's stats API.
+    attributes:
+      - ref: k8s.volume.name
+        requirement_level: required
+      - ref: k8s.volume.type
+        requirement_level: recommended
+  - id: metric.k8s.pod.volume.inode.count
+    type: metric
+    metric_name: k8s.pod.volume.inode.count
+    stability: development
+    brief: "The total inodes in the filesystem of the Pod's volume"
+    instrument: updowncounter
+    annotations:
+      code_generation:
+        metric_value_type: int
+    unit: "{inode}"
+    entity_associations:
+      - k8s.pod
+    note: |
+      This metric is derived from the
+      [VolumeStats.Inodes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#VolumeStats) field
+      of the [PodStats](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats) of the
+      Kubelet's stats API.
+    attributes:
+      - ref: k8s.volume.name
+        requirement_level: required
+      - ref: k8s.volume.type
+        requirement_level: recommended
+  - id: metric.k8s.pod.volume.inode.used
+    type: metric
+    metric_name: k8s.pod.volume.inode.used
+    stability: development
+    brief: "The inodes used by the filesystem of the Pod's volume"
+    instrument: updowncounter
+    annotations:
+      code_generation:
+        metric_value_type: int
+    unit: "{inode}"
+    entity_associations:
+      - k8s.pod
+    note: |
+      This metric is derived from the
+      [VolumeStats.InodesUsed](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#VolumeStats) field
+      of the [PodStats](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats) of the
+      Kubelet's stats API.
+
+      This may not be equal to `inodes - free` because filesystem may share inodes with other filesystems.
+    attributes:
+      - ref: k8s.volume.name
+        requirement_level: required
+      - ref: k8s.volume.type
+        requirement_level: recommended
+  - id: metric.k8s.pod.volume.inode.free
+    type: metric
+    metric_name: k8s.pod.volume.inode.free
+    stability: development
+    brief: "The free inodes in the filesystem of the Pod's volume"
+    instrument: updowncounter
+    annotations:
+      code_generation:
+        metric_value_type: int
+    unit: "{inode}"
+    entity_associations:
+      - k8s.pod
+    note: |
+      This metric is derived from the
+      [VolumeStats.InodesFree](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#VolumeStats) field
+      of the [PodStats](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#PodStats) of the
+      Kubelet's stats API.
+    attributes:
+      - ref: k8s.volume.name
+        requirement_level: required
+      - ref: k8s.volume.type
+        requirement_level: recommended
+
   # k8s.container.* metrics
   - id: metric.k8s.container.status.state
     type: metric