Add {k8s.node, k8s.pod, container}.filesystem. metrics (#2392)

Signed-off-by: ChrsMark <chrismarkou92@gmail.com>
Co-authored-by: Jina Jain <jjain@splunk.com>

.chloggen/add_k8s_fs_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 node, pod, container filesystem 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: [1488]
+
+# (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

@@ -61,6 +61,7 @@ and one for disabling the old schema called `semconv.k8s.disableLegacy`. Then:
   - [K8s Container metrics](#k8s-container-metrics)
   - [K8s ResourceQuota metrics](#k8s-resourcequota-metrics)
   - [K8s Node condition metrics](#k8s-node-condition-metrics)
+  - [K8s Filesystem metrics](#k8s-filesystem-metrics)
 
 <!-- tocstop -->
 
@@ -370,3 +371,28 @@ The changes in their metrics are the following:
 | `k8s.node.condition_*`                                                             | `k8s.node.condition.status` metric [0,1] with attribute `k8s.node.condition.type` for the different conditions and `k8s.node.condition.status` for true/false/unknown |
 
 <!-- prettier-ignore-end -->
+
+### K8s Filesystem metrics
+
+The K8s Filesystem metrics implemented by the Collector and specifically the
+[k8scluster](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/v0.115.0/receiver/k8sclusterreceiver/documentation.md)
+receiver were introduced as semantic conventions in
+[#2392](https://github.com/open-telemetry/semantic-conventions/pull/2392)
+
+The changes in their metrics are the following:
+
+<!-- prettier-ignore-start -->
+
+| Old (Collector) ![changed](https://img.shields.io/badge/changed-orange?style=flat) | New                                                                                                                                                  |
+|------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `k8s.node.filesystem.available` gauge                                              | `k8s.node.filesystem.available` updowncounter |
+| `k8s.node.filesystem.capacity`   gauge                                             | `k8s.node.filesystem.capacity`  updowncounter |
+| `k8s.node.filesystem.usage`      gauge                                             | `k8s.node.filesystem.usage`     updowncounter |
+| `k8s.pod.filesystem.available`   gauge                                             | `k8s.pod.filesystem.available`     updowncounter |
+| `k8s.pod.filesystem.capacity`    gauge                                                  | `k8s.pod.filesystem.capacity`   updowncounter |
+| `k8s.pod.filesystem.usage`      gauge                                                   | `k8s.pod.filesystem.usage`      updowncounter |
+| `container.filesystem.available`    gauge                                               | `container.filesystem.available`   updowncounter |
+| `container.filesystem.capacity`      gauge                                              | `container.filesystem.capacity`    updowncounter |
+| `container.filesystem.usage`        gauge                                               | `container.filesystem.usage`       updowncounter |
+
+<!-- prettier-ignore-end -->

docs/system/container-metrics.md

@@ -12,6 +12,20 @@ This document describes instruments and attributes for common container level
 metrics in OpenTelemetry. These metrics are collected from technology-specific,
 well-defined APIs (e.g. Kubelet's API or container runtimes).
 
+<!-- toc -->
+
+- [Metric: `container.uptime`](#metric-containeruptime)
+- [Metric: `container.cpu.time`](#metric-containercputime)
+- [Metric: `container.cpu.usage`](#metric-containercpuusage)
+- [Metric: `container.memory.usage`](#metric-containermemoryusage)
+- [Metric: `container.disk.io`](#metric-containerdiskio)
+- [Metric: `container.network.io`](#metric-containernetworkio)
+- [Metric: `container.filesystem.available`](#metric-containerfilesystemavailable)
+- [Metric: `container.filesystem.capacity`](#metric-containerfilesystemcapacity)
+- [Metric: `container.filesystem.usage`](#metric-containerfilesystemusage)
+
+<!-- tocstop -->
+
 ### Metric: `container.uptime`
 
 This metric is [recommended][MetricRecommended].
@@ -219,6 +233,83 @@ This metric is [opt-in][MetricOptIn].
 <!-- END AUTOGENERATED TEXT -->
 <!-- endsemconv -->
 
+### Metric: `container.filesystem.available`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.container.filesystem.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 |
+| -------- | --------------- | ----------- | -------------- | --------- | ------ |
+| `container.filesystem.available` | UpDownCounter | `By` | Container filesystem available bytes [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`container`](/docs/registry/entities/container.md#container) |
+
+**[1]:** In K8s, this metric is derived from the
+[FsStats.AvailableBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+of the [ContainerStats.Rootfs](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#ContainerStats)
+of the Kubelet's stats API.
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `container.filesystem.capacity`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.container.filesystem.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 |
+| -------- | --------------- | ----------- | -------------- | --------- | ------ |
+| `container.filesystem.capacity` | UpDownCounter | `By` | Container filesystem capacity [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`container`](/docs/registry/entities/container.md#container) |
+
+**[1]:** In K8s, this metric is derived from the
+[FsStats.CapacityBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+of the [ContainerStats.Rootfs](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#ContainerStats)
+of the Kubelet's stats API.
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `container.filesystem.usage`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.container.filesystem.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 |
+| -------- | --------------- | ----------- | -------------- | --------- | ------ |
+| `container.filesystem.usage` | UpDownCounter | `By` | Container filesystem usage [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`container`](/docs/registry/entities/container.md#container) |
+
+**[1]:** This may not equal capacity - available.
+
+In K8s, this metric is derived from the
+[FsStats.UsedBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+of the [ContainerStats.Rootfs](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#ContainerStats)
+of the Kubelet's stats API.
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
 [DocumentStatus]: https://opentelemetry.io/docs/specs/otel/document-status
 [MetricOptIn]: /docs/general/metric-requirement-level.md#opt-in
 [MetricRecommended]: /docs/general/metric-requirement-level.md#recommended

docs/system/k8s-metrics.md

@@ -24,6 +24,9 @@ and therefore inherit its attributes, like `k8s.pod.name` and `k8s.pod.uid`.
   - [Metric: `k8s.pod.memory.usage`](#metric-k8spodmemoryusage)
   - [Metric: `k8s.pod.network.io`](#metric-k8spodnetworkio)
   - [Metric: `k8s.pod.network.errors`](#metric-k8spodnetworkerrors)
+  - [Metric: `k8s.pod.filesystem.available`](#metric-k8spodfilesystemavailable)
+  - [Metric: `k8s.pod.filesystem.capacity`](#metric-k8spodfilesystemcapacity)
+  - [Metric: `k8s.pod.filesystem.usage`](#metric-k8spodfilesystemusage)
 - [Container metrics](#container-metrics)
   - [Metric: `k8s.container.status.state`](#metric-k8scontainerstatusstate)
   - [Metric: `k8s.container.status.reason`](#metric-k8scontainerstatusreason)
@@ -39,6 +42,9 @@ and therefore inherit its attributes, like `k8s.pod.name` and `k8s.pod.uid`.
   - [Metric: `k8s.node.memory.usage`](#metric-k8snodememoryusage)
   - [Metric: `k8s.node.network.io`](#metric-k8snodenetworkio)
   - [Metric: `k8s.node.network.errors`](#metric-k8snodenetworkerrors)
+  - [Metric: `k8s.node.filesystem.available`](#metric-k8snodefilesystemavailable)
+  - [Metric: `k8s.node.filesystem.capacity`](#metric-k8snodefilesystemcapacity)
+  - [Metric: `k8s.node.filesystem.usage`](#metric-k8snodefilesystemusage)
 - [Deployment metrics](#deployment-metrics)
   - [Metric: `k8s.deployment.desired_pods`](#metric-k8sdeploymentdesired_pods)
   - [Metric: `k8s.deployment.available_pods`](#metric-k8sdeploymentavailable_pods)
@@ -272,6 +278,83 @@ This metric is [recommended][MetricRecommended].
 <!-- END AUTOGENERATED TEXT -->
 <!-- endsemconv -->
 
+### Metric: `k8s.pod.filesystem.available`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.pod.filesystem.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.filesystem.available` | UpDownCounter | `By` | Pod filesystem available bytes [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
+[FsStats.AvailableBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+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.
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.pod.filesystem.capacity`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.pod.filesystem.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.filesystem.capacity` | UpDownCounter | `By` | Pod filesystem 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
+[FsStats.CapacityBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+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.
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.pod.filesystem.usage`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.pod.filesystem.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.filesystem.usage` | UpDownCounter | `By` | Pod filesystem 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
+[FsStats.UsedBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+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.
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
 ## Container metrics
 
 **Description:** Container level metrics captured under the namespace `k8s.container`.
@@ -659,6 +742,83 @@ This metric is [recommended][MetricRecommended].
 <!-- END AUTOGENERATED TEXT -->
 <!-- endsemconv -->
 
+### Metric: `k8s.node.filesystem.available`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.node.filesystem.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.node.filesystem.available` | UpDownCounter | `By` | Node filesystem available bytes [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`k8s.node`](/docs/registry/entities/k8s.md#k8s-node) |
+
+**[1]:** This metric is derived from the
+[FsStats.AvailableBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+of the [NodeStats.Fs](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#NodeStats)
+of the Kubelet's stats API.
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.node.filesystem.capacity`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.node.filesystem.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.node.filesystem.capacity` | UpDownCounter | `By` | Node filesystem capacity [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`k8s.node`](/docs/registry/entities/k8s.md#k8s-node) |
+
+**[1]:** This metric is derived from the
+[FsStats.CapacityBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+of the [NodeStats.Fs](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#NodeStats)
+of the Kubelet's stats API.
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.node.filesystem.usage`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.node.filesystem.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.node.filesystem.usage` | UpDownCounter | `By` | Node filesystem usage [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`k8s.node`](/docs/registry/entities/k8s.md#k8s-node) |
+
+**[1]:** This may not equal capacity - available.
+
+This metric is derived from the
+[FsStats.UsedBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+of the [NodeStats.Fs](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#NodeStats)
+of the Kubelet's stats API.
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
 ## Deployment metrics
 
 **Description:** Deployment level metrics captured under the namespace `k8s.deployment`.

model/container/metrics.yaml

@@ -102,3 +102,58 @@ groups:
     attributes:
       - ref: network.io.direction
       - ref: network.interface.name
+
+  # container.filesystem.* metrics
+  - id: metric.container.filesystem.available
+    type: metric
+    metric_name: container.filesystem.available
+    stability: development
+    brief: "Container filesystem available bytes"
+    instrument: updowncounter
+    unit: "By"
+    annotations:
+      code_generation:
+        metric_value_type: int
+    entity_associations:
+      - container
+    note: |
+      In K8s, this metric is derived from the
+      [FsStats.AvailableBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+      of the [ContainerStats.Rootfs](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#ContainerStats)
+      of the Kubelet's stats API.
+  - id: metric.container.filesystem.capacity
+    type: metric
+    metric_name: container.filesystem.capacity
+    stability: development
+    brief: "Container filesystem capacity"
+    instrument: updowncounter
+    unit: "By"
+    annotations:
+      code_generation:
+        metric_value_type: int
+    entity_associations:
+      - container
+    note: |
+      In K8s, this metric is derived from the
+      [FsStats.CapacityBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+      of the [ContainerStats.Rootfs](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#ContainerStats)
+      of the Kubelet's stats API.
+  - id: metric.container.filesystem.usage
+    type: metric
+    metric_name: container.filesystem.usage
+    stability: development
+    brief: "Container filesystem usage"
+    instrument: updowncounter
+    unit: "By"
+    annotations:
+      code_generation:
+        metric_value_type: int
+    entity_associations:
+      - container
+    note: |
+      This may not equal capacity - available.
+
+      In K8s, this metric is derived from the
+      [FsStats.UsedBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+      of the [ContainerStats.Rootfs](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#ContainerStats)
+      of the Kubelet's stats API.

model/k8s/metrics.yaml

@@ -91,6 +91,61 @@ groups:
       - ref: network.interface.name
       - ref: network.io.direction
 
+  # k8s.pod.filesystem.* metrics
+  - id: metric.k8s.pod.filesystem.available
+    type: metric
+    metric_name: k8s.pod.filesystem.available
+    stability: development
+    brief: "Pod filesystem available bytes"
+    instrument: updowncounter
+    unit: "By"
+    annotations:
+      code_generation:
+        metric_value_type: int
+    entity_associations:
+      - k8s.pod
+    note: |
+      This metric is derived from the
+      [FsStats.AvailableBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+      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.
+  - id: metric.k8s.pod.filesystem.capacity
+    type: metric
+    metric_name: k8s.pod.filesystem.capacity
+    stability: development
+    brief: "Pod filesystem capacity"
+    instrument: updowncounter
+    unit: "By"
+    annotations:
+      code_generation:
+        metric_value_type: int
+    entity_associations:
+      - k8s.pod
+    note: |
+      This metric is derived from the
+      [FsStats.CapacityBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+      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.
+  - id: metric.k8s.pod.filesystem.usage
+    type: metric
+    metric_name: k8s.pod.filesystem.usage
+    stability: development
+    brief: "Pod filesystem usage"
+    instrument: updowncounter
+    unit: "By"
+    annotations:
+      code_generation:
+        metric_value_type: int
+    entity_associations:
+      - k8s.pod
+    note: |
+      This may not equal capacity - available.
+
+      This metric is derived from the
+      [FsStats.UsedBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+      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.container.* metrics
   - id: metric.k8s.container.status.state
     type: metric
@@ -245,6 +300,61 @@ groups:
       - k8s.node
     unit: "{cpu}"
 
+  # k8s.node.filesystem.* metrics
+  - id: metric.k8s.node.filesystem.available
+    type: metric
+    metric_name: k8s.node.filesystem.available
+    stability: development
+    brief: "Node filesystem available bytes"
+    instrument: updowncounter
+    unit: "By"
+    annotations:
+      code_generation:
+        metric_value_type: int
+    entity_associations:
+      - k8s.node
+    note: |
+      This metric is derived from the
+      [FsStats.AvailableBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+      of the [NodeStats.Fs](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#NodeStats)
+      of the Kubelet's stats API.
+  - id: metric.k8s.node.filesystem.capacity
+    type: metric
+    metric_name: k8s.node.filesystem.capacity
+    stability: development
+    brief: "Node filesystem capacity"
+    instrument: updowncounter
+    unit: "By"
+    annotations:
+      code_generation:
+        metric_value_type: int
+    entity_associations:
+      - k8s.node
+    note: |
+      This metric is derived from the
+      [FsStats.CapacityBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+      of the [NodeStats.Fs](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#NodeStats)
+      of the Kubelet's stats API.
+  - id: metric.k8s.node.filesystem.usage
+    type: metric
+    metric_name: k8s.node.filesystem.usage
+    stability: development
+    brief: "Node filesystem usage"
+    instrument: updowncounter
+    unit: "By"
+    annotations:
+      code_generation:
+        metric_value_type: int
+    entity_associations:
+      - k8s.node
+    note: |
+      This may not equal capacity - available.
+
+      This metric is derived from the
+      [FsStats.UsedBytes](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#FsStats) field
+      of the [NodeStats.Fs](https://pkg.go.dev/k8s.io/kubelet@v0.33.0/pkg/apis/stats/v1alpha1#NodeStats)
+      of the Kubelet's stats API.
+
   # k8s.node.memory.* metrics
   - id: metric.k8s.node.memory.usage
     type: metric