[receiver/k8s_cluster] Add back all other vendor-specific node condit…

…ions (#23854)

**Description:**
Add back all other vendor-specific node conditions, and report them even
if missing, as well as all allocatable node metrics if present, to the
list of Kubernetes node metrics available, which went missing during the
pdata translation

**Link to tracking Issue:**
Fixes #23839

**Testing:**
Unit tests.

**Documentation:**
Not quite. Maybe a doc entry is required here. I haven't looked yet
where to place it.

.chloggen/add-back-other-node-conditions-and-allocatable-resources.yaml

@@ -0,0 +1,20 @@
+# Use this changelog template to create an entry for release notes.
+# If your change doesn't affect end users, such as a test fix or a tooling change,
+# 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: bug_fix
+
+# 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: Add back all other vendor-specific node conditions, and report them even if missing, as well as all allocatable node metrics if present,  to the list of Kubernetes node metrics available, which went missing during the pdata translation
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [23839]
+
+# (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:

receiver/k8sclusterreceiver/go.mod

@@ -6,6 +6,7 @@ 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 v0.80.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal v0.80.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/k8sconfig v0.80.0

receiver/k8sclusterreceiver/internal/node/nodes.go

@@ -7,11 +7,11 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/iancoleman/strcase"
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/pmetric"
 	"go.opentelemetry.io/collector/receiver"
 	conventions "go.opentelemetry.io/collector/semconv/v1.6.1"
-	"go.uber.org/zap"
 	corev1 "k8s.io/api/core/v1"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/common/maps"
@@ -46,23 +46,30 @@ func Transform(node *corev1.Node) *corev1.Node {
 func GetMetrics(set receiver.CreateSettings, node *corev1.Node, nodeConditionTypesToReport, allocatableTypesToReport []string) pmetric.Metrics {
 	mb := imetadata.NewMetricsBuilder(imetadata.DefaultMetricsBuilderConfig(), set)
 	ts := pcommon.NewTimestampFromTime(time.Now())
+	customMetrics := pmetric.NewMetricSlice()
 
 	// Adding 'node condition type' metrics
 	for _, nodeConditionTypeValue := range nodeConditionTypesToReport {
 		v1NodeConditionTypeValue := corev1.NodeConditionType(nodeConditionTypeValue)
+		v := nodeConditionValue(node, v1NodeConditionTypeValue)
 		switch v1NodeConditionTypeValue {
 		case corev1.NodeReady:
-			mb.RecordK8sNodeConditionReadyDataPoint(ts, nodeConditionValue(node, v1NodeConditionTypeValue))
+			mb.RecordK8sNodeConditionReadyDataPoint(ts, v)
 		case corev1.NodeMemoryPressure:
-			mb.RecordK8sNodeConditionMemoryPressureDataPoint(ts, nodeConditionValue(node, v1NodeConditionTypeValue))
+			mb.RecordK8sNodeConditionMemoryPressureDataPoint(ts, v)
 		case corev1.NodeDiskPressure:
-			mb.RecordK8sNodeConditionDiskPressureDataPoint(ts, nodeConditionValue(node, v1NodeConditionTypeValue))
+			mb.RecordK8sNodeConditionDiskPressureDataPoint(ts, v)
 		case corev1.NodeNetworkUnavailable:
-			mb.RecordK8sNodeConditionNetworkUnavailableDataPoint(ts, nodeConditionValue(node, v1NodeConditionTypeValue))
+			mb.RecordK8sNodeConditionNetworkUnavailableDataPoint(ts, v)
 		case corev1.NodePIDPressure:
-			mb.RecordK8sNodeConditionPidPressureDataPoint(ts, nodeConditionValue(node, v1NodeConditionTypeValue))
+			mb.RecordK8sNodeConditionPidPressureDataPoint(ts, v)
 		default:
-			set.Logger.Warn("unknown node condition type", zap.String("conditionType", nodeConditionTypeValue))
+			customMetric := customMetrics.AppendEmpty()
+			customMetric.SetName(getNodeConditionMetric(nodeConditionTypeValue))
+			g := customMetric.SetEmptyGauge()
+			dp := g.DataPoints().AppendEmpty()
+			dp.SetIntValue(v)
+			dp.SetTimestamp(ts)
 		}
 	}
 
@@ -89,10 +96,17 @@ func GetMetrics(set receiver.CreateSettings, node *corev1.Node, nodeConditionTyp
 		case corev1.ResourcePods:
 			mb.RecordK8sNodeAllocatablePodsDataPoint(ts, quantity.Value())
 		default:
-			set.Logger.Warn("unknown node condition type", zap.Any("conditionType", v1NodeAllocatableTypeValue))
+			customMetric := customMetrics.AppendEmpty()
+			customMetric.SetName(getNodeAllocatableMetric(nodeAllocatableTypeValue))
+			g := customMetric.SetEmptyGauge()
+			dp := g.DataPoints().AppendEmpty()
+			dp.SetIntValue(quantity.Value())
+			dp.SetTimestamp(ts)
 		}
 	}
-	return mb.Emit(imetadata.WithK8sNodeUID(string(node.UID)), imetadata.WithK8sNodeName(node.Name), imetadata.WithOpencensusResourcetype("k8s"))
+	m := mb.Emit(imetadata.WithK8sNodeUID(string(node.UID)), imetadata.WithK8sNodeName(node.Name), imetadata.WithOpencensusResourcetype("k8s"))
+	customMetrics.MoveAndAppendTo(m.ResourceMetrics().At(0).ScopeMetrics().At(0).Metrics())
+	return m
 
 }
 
@@ -128,3 +142,11 @@ func GetMetadata(node *corev1.Node) map[experimentalmetricmetadata.ResourceID]*m
 		},
 	}
 }
+
+func getNodeConditionMetric(nodeConditionTypeValue string) string {
+	return fmt.Sprintf("k8s.node.condition_%s", strcase.ToSnake(nodeConditionTypeValue))
+}
+
+func getNodeAllocatableMetric(nodeAllocatableTypeValue string) string {
+	return fmt.Sprintf("k8s.node.allocatable_%s", strcase.ToSnake(nodeAllocatableTypeValue))
+}

receiver/k8sclusterreceiver/internal/node/nodes_test.go

@@ -21,7 +21,26 @@ import (
 
 func TestNodeMetricsReportCPUMetrics(t *testing.T) {
 	n := testutils.NewNode("1")
-	m := GetMetrics(receivertest.NewNopCreateSettings(), n, []string{"Ready", "MemoryPressure", "DiskPressure", "NetworkUnavailable", "PIDPressure", "OutOfDisk"}, []string{"cpu", "memory", "ephemeral-storage", "storage", "pods", "hugepages-1Gi", "hugepages-2Mi"})
+	m := GetMetrics(receivertest.NewNopCreateSettings(), n,
+		[]string{
+			"Ready",
+			"MemoryPressure",
+			"DiskPressure",
+			"NetworkUnavailable",
+			"PIDPressure",
+			"OutOfDisk",
+		},
+		[]string{
+			"cpu",
+			"memory",
+			"ephemeral-storage",
+			"storage",
+			"pods",
+			"hugepages-1Gi",
+			"hugepages-2Mi",
+			"not-present",
+		},
+	)
 	expected, err := golden.ReadMetrics(filepath.Join("testdata", "expected.yaml"))
 	require.NoError(t, err)
 	require.NoError(t, pmetrictest.CompareMetrics(expected, m,

receiver/k8sclusterreceiver/internal/node/testdata/expected.yaml

@@ -67,6 +67,18 @@ resourceMetrics:
                 - asInt: "1"
             name: k8s.node.condition_ready
             unit: "1"
+          - gauge:
+              dataPoints:
+                - asInt: "-1"
+            name: k8s.node.condition_out_of_disk
+          - gauge:
+              dataPoints:
+                - asInt: "2"
+            name: k8s.node.allocatable_hugepages_1_gi
+          - gauge:
+              dataPoints:
+                - asInt: "2048"
+            name: k8s.node.allocatable_hugepages_2_mi
         scope:
           name: otelcol/k8sclusterreceiver
           version: latest

receiver/k8sclusterreceiver/internal/testutils/objects.go

@@ -171,6 +171,9 @@ func NewNode(id string) *corev1.Node {
 				corev1.ResourceMemory:           *resource.NewQuantity(456, resource.DecimalSI),
 				corev1.ResourceEphemeralStorage: *resource.NewQuantity(1234, resource.DecimalSI),
 				corev1.ResourcePods:             *resource.NewQuantity(12, resource.DecimalSI),
+				"hugepages-1Gi":                 *resource.NewQuantity(2, resource.DecimalSI),
+				"hugepages-2Mi":                 *resource.NewQuantity(2048, resource.DecimalSI),
+				"hugepages-5Mi":                 *resource.NewQuantity(2048, resource.DecimalSI),
 			},
 		},
 	}