Add new k8s.node.filesystem semantic conventions

.chloggen/add-k8s-node-inode-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.filesystem.inode.count` and `k8s.node.filesystem.inode.free` metrics to track Kubernetes node root filesystem inode capacity and usage."
+
+# 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: [3858]
+
+# (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/system/k8s-metrics.md

@@ -61,6 +61,8 @@ and therefore inherit its attributes, like `k8s.pod.name` and `k8s.pod.uid`.
   - [Metric: `k8s.node.filesystem.available`](#metric-k8snodefilesystemavailable)
   - [Metric: `k8s.node.filesystem.capacity`](#metric-k8snodefilesystemcapacity)
   - [Metric: `k8s.node.filesystem.usage`](#metric-k8snodefilesystemusage)
+  - [Metric: `k8s.node.filesystem.inode.count`](#metric-k8snodefilesysteminodecount)
+  - [Metric: `k8s.node.filesystem.inode.free`](#metric-k8snodefilesysteminodefree)
   - [Metric: `k8s.node.system_container.cpu.usage`](#metric-k8snodesystem_containercpuusage)
   - [Metric: `k8s.node.system_container.cpu.time`](#metric-k8snodesystem_containercputime)
   - [Metric: `k8s.node.system_container.memory.working_set`](#metric-k8snodesystem_containermemoryworking_set)
@@ -1317,6 +1319,50 @@ of the Kubelet's stats API.
 <!-- END AUTOGENERATED TEXT -->
 <!-- endsemconv -->
 
+### Metric: `k8s.node.filesystem.inode.count`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.node.filesystem.inode.count -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+
+| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
+| -------- | --------------- | ----------- | -------------- | --------- | ------ |
+| `k8s.node.filesystem.inode.count` | UpDownCounter | `{inode}` | The total inodes in the node's root filesystem. [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.Inodes](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.
+
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.node.filesystem.inode.free`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.node.filesystem.inode.free -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+
+| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
+| -------- | --------------- | ----------- | -------------- | --------- | ------ |
+| `k8s.node.filesystem.inode.free` | UpDownCounter | `{inode}` | The free inodes in the node's root filesystem. [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.InodesFree](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.
+
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
 ### Metric: `k8s.node.system_container.cpu.usage`
 
 This metric is [recommended][MetricRecommended].

model/k8s/metrics.yaml

@@ -689,6 +689,41 @@ groups:
       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.inode.count
+    type: metric
+    metric_name: k8s.node.filesystem.inode.count
+    stability: development
+    brief: "The total inodes in the node's root filesystem."
+    instrument: updowncounter
+    annotations:
+      code_generation:
+        metric_value_type: int
+    unit: "{inode}"
+    entity_associations:
+      - k8s.node
+    note: |
+      This metric is derived from the
+      [FsStats.Inodes](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.inode.free
+    type: metric
+    metric_name: k8s.node.filesystem.inode.free
+    stability: development
+    brief: "The free inodes in the node's root filesystem."
+    instrument: updowncounter
+    annotations:
+      code_generation:
+        metric_value_type: int
+    unit: "{inode}"
+    entity_associations:
+      - k8s.node
+    note: |
+      This metric is derived from the
+      [FsStats.InodesFree](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