[receiver/k8s_cluster] move node metrics to pdata (open-telemetry#23438)

Switch k8s.node metrics to use pdata.

.chloggen/switchk8snode.yaml

@@ -0,0 +1,11 @@
+# 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: k8sclusterreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Switch k8s.node metrics to use pdata.
+
+# One or more tracking issues related to the change
+issues: [23438]

receiver/k8sclusterreceiver/go.mod

@@ -6,7 +6,6 @@ require (
 	github.com/census-instrumentation/opencensus-proto v0.4.1
 	github.com/google/go-cmp v0.5.9
 	github.com/google/uuid v1.3.0
-	github.com/iancoleman/strcase v0.2.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/common v0.79.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal v0.79.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/k8sconfig v0.79.0

receiver/k8sclusterreceiver/internal/collection/collector.go

@@ -106,7 +106,7 @@ func (dc *DataCollector) SyncMetrics(obj interface{}) {
 	case *corev1.Pod:
 		md = ocsToMetrics(pod.GetMetrics(o, dc.settings.TelemetrySettings.Logger))
 	case *corev1.Node:
-		md = ocsToMetrics(node.GetMetrics(o, dc.nodeConditionsToReport, dc.allocatableTypesToReport, dc.settings.TelemetrySettings.Logger))
+		md = node.GetMetrics(dc.settings, o, dc.nodeConditionsToReport, dc.allocatableTypesToReport)
 	case *corev1.Namespace:
 		md = namespace.GetMetrics(dc.settings, o)
 	case *corev1.ReplicationController:

receiver/k8sclusterreceiver/internal/node/doc.go

@@ -0,0 +1,6 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+//go:generate mdatagen metadata.yaml
+
+package node // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/k8sclusterreceiver/internal/node"

receiver/k8sclusterreceiver/internal/node/documentation.md

@@ -0,0 +1,93 @@
+[comment]: <> (Code generated by mdatagen. DO NOT EDIT.)
+
+# k8s/node
+
+## Default Metrics
+
+The following metrics are emitted by default. Each of them can be disabled by applying the following configuration:
+
+```yaml
+metrics:
+  <metric_name>:
+    enabled: false
+```
+
+### k8s.node.allocatable_cpu
+
+How many CPU cores remaining that the node can allocate to pods
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| {cores} | Gauge | Double |
+
+### k8s.node.allocatable_ephemeral_storage
+
+How many bytes of ephemeral storage remaining that the node can allocate to pods
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| By | Gauge | Int |
+
+### k8s.node.allocatable_memory
+
+How many bytes of RAM memory remaining that the node can allocate to pods
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| By | Gauge | Int |
+
+### k8s.node.allocatable_storage
+
+How many bytes of storage remaining that the node can allocate to pods
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| By | Gauge | Int |
+
+### k8s.node.condition_disk_pressure
+
+Whether this node is DiskPressure (1), not DiskPressure (0) or in an unknown state (-1)
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| 1 | Gauge | Int |
+
+### k8s.node.condition_memory_pressure
+
+Whether this node is MemoryPressure (1), not MemoryPressure (0) or in an unknown state (-1)
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| 1 | Gauge | Int |
+
+### k8s.node.condition_network_unavailable
+
+Whether this node is NetworkUnavailable (1), not NetworkUnavailable (0) or in an unknown state (-1)
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| 1 | Gauge | Int |
+
+### k8s.node.condition_pid_pressure
+
+Whether this node is PidPressure (1), not PidPressure (0) or in an unknown state (-1)
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| 1 | Gauge | Int |
+
+### k8s.node.condition_ready
+
+Whether this node is Ready (1), not Ready (0) or in an unknown state (-1)
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| 1 | Gauge | Int |
+
+## Resource Attributes
+
+| Name | Description | Values | Enabled |
+| ---- | ----------- | ------ | ------- |
+| k8s.node.name | The k8s node name. | Any Str | true |
+| k8s.node.uid | The k8s node uid. | Any Str | true |
+| opencensus.resourcetype | The OpenCensus resource type. | Any Str | true |