[chore] Kubernetes receiver improvements (#52)

* Avoid api server calls, use metadatastore

* change pod transformer to preserve serviceAccountName

* Remove api server calls for service from k8sclusterreceiver

receiver/k8sclusterreceiver/internal/collection/collector.go

@@ -134,6 +134,7 @@ func (dc *DataCollector) CollectMetricData(currentTime time.Time) pmetric.Metric
 	dc.metadataStore.ForEach(gvk.StatefulSet, func(o any) {
 		statefulset.RecordMetrics(dc.metricsBuilder, o.(*appsv1.StatefulSet), ts)
 	})
+
 	dc.metadataStore.ForEach(gvk.Job, func(o any) {
 		jobs.RecordMetrics(dc.metricsBuilder, o.(*batchv1.Job), ts)
 	})

receiver/k8sclusterreceiver/internal/constants/constants.go

@@ -37,3 +37,8 @@ const (
 
 	K8sServicePrefix = "k8s.service."
 )
+
+// Middleware.io constants
+const (
+	MWK8sServiceName = "middleware.io/k8s.service.name"
+)

receiver/k8sclusterreceiver/internal/pod/pods.go

@@ -4,10 +4,6 @@
 package pod // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/k8sclusterreceiver/internal/pod"
 
 import (
-	"context"
-	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/k8sconfig"
-	"k8s.io/apimachinery/pkg/labels"
-	k8s "k8s.io/client-go/kubernetes"
 	"strings"
 	"time"
 
@@ -72,18 +68,18 @@ func Transform(pod *corev1.Pod) *corev1.Pod {
 			},
 		})
 	}
+	newPod.Spec.ServiceAccountName = pod.Spec.ServiceAccountName
 	return newPod
 }
 
 func RecordMetrics(logger *zap.Logger, mb *metadata.MetricsBuilder, pod *corev1.Pod, ts pcommon.Timestamp) {
-	client, err := k8sconfig.MakeClient(k8sconfig.APIConfig{
-		AuthType: k8sconfig.AuthTypeServiceAccount,
-	})
-	if err != nil {
-		logger.Error(err.Error())
-	}
 
-	jobInfo := getJobInfoForPod(client, pod)
+	var jobName, jobUID string
+	ownerReference := utils.FindOwnerWithKind(pod.OwnerReferences, constants.K8sKindJob)
+	if ownerReference != nil && ownerReference.Kind == constants.K8sKindJob {
+		jobName = ownerReference.Name
+		jobUID = string(ownerReference.UID)
+	}
 
 	mb.RecordK8sPodPhaseDataPoint(ts, int64(phaseToInt(pod.Status.Phase)))
 	mb.RecordK8sPodStatusReasonDataPoint(ts, int64(reasonToInt(pod.Status.Reason)))
@@ -92,13 +88,18 @@ func RecordMetrics(logger *zap.Logger, mb *metadata.MetricsBuilder, pod *corev1.
 	rb.SetK8sNodeName(pod.Spec.NodeName)
 	rb.SetK8sPodName(pod.Name)
 	rb.SetK8sPodUID(string(pod.UID))
-	rb.SetK8sPodStartTime(pod.GetCreationTimestamp().String())
-	rb.SetK8sPodQosClass(string(pod.Status.QOSClass))
-	rb.SetK8sServiceName(getServiceNameForPod(client, pod))
+	rb.SetK8sPodStartTime(pod.CreationTimestamp.String())
+	rb.SetOpencensusResourcetype("k8s")
+
+	svcName, ok := pod.Labels[constants.MWK8sServiceName]
+	if ok {
+		rb.SetK8sServiceName(svcName)
+	}
+
+    rb.SetK8sPodQosClass(string(pod.Status.QOSClass))
 	rb.SetK8sJobName(jobInfo.Name)
-	rb.SetK8sJobUID(string(jobInfo.UID))
-	rb.SetK8sPodStartTime(pod.GetCreationTimestamp().String())
-	rb.SetK8sServiceAccountName(getServiceAccountNameForPod(client, pod))
+    rb.SetK8sJobUID(string(jobInfo.UID))
+	rb.SetK8sServiceAccountName(pod.Spec.ServiceAccountName)
 	rb.SetK8sClusterName("unknown")
 	mb.EmitForResource(metadata.WithResource(rb.Emit()))
 
@@ -107,62 +108,6 @@ func RecordMetrics(logger *zap.Logger, mb *metadata.MetricsBuilder, pod *corev1.
 	}
 }
 
-func getServiceNameForPod(client k8s.Interface, pod *corev1.Pod) string {
-	var serviceName string
-
-	serviceList, err := client.CoreV1().Services(pod.Namespace).List(context.TODO(), v1.ListOptions{})
-	if err != nil {
-		return ""
-	}
-
-	for _, svc := range serviceList.Items {
-		if svc.Spec.Selector != nil {
-			if labels.Set(svc.Spec.Selector).AsSelectorPreValidated().Matches(labels.Set(pod.Labels)) {
-				serviceName = svc.Name
-				return serviceName
-			}
-		}
-	}
-
-	return ""
-}
-
-type JobInfo struct {
-	Name string
-	UID  types.UID
-}
-
-func getJobInfoForPod(client k8s.Interface, pod *corev1.Pod) JobInfo {
-	podSelector := labels.Set(pod.Labels)
-	jobList, err := client.BatchV1().Jobs(pod.Namespace).List(context.TODO(), v1.ListOptions{
-		LabelSelector: podSelector.AsSelector().String(),
-	})
-	if err != nil {
-		return JobInfo{}
-	}
-
-	if len(jobList.Items) > 0 {
-		return JobInfo{
-			Name: jobList.Items[0].Name,
-			UID:  jobList.Items[0].UID,
-		}
-	}
-
-	return JobInfo{}
-}
-
-func getServiceAccountNameForPod(client k8s.Interface, pod *corev1.Pod) string {
-	var serviceAccountName string
-
-	podDetails, err := client.CoreV1().Pods(pod.Namespace).Get(context.TODO(), pod.Name, v1.GetOptions{})
-	if err != nil {
-		return ""
-	}
-
-	serviceAccountName = podDetails.Spec.ServiceAccountName
-	return serviceAccountName
-}
-
 func reasonToInt(reason string) int32 {
 	switch reason {
 	case "Evicted":

receiver/k8sclusterreceiver/internal/pod/pods_test.go

@@ -4,7 +4,6 @@
 package pod
 
 import (
-	"context"
 	"fmt"
 	"path/filepath"
 	"strings"
@@ -22,7 +21,6 @@ import (
 	"k8s.io/apimachinery/pkg/api/resource"
 	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
-	"k8s.io/client-go/kubernetes/fake"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/experimentalmetricmetadata"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/golden"
@@ -414,6 +412,7 @@ func TestTransform(t *testing.T) {
 					},
 				},
 			},
+			ServiceAccountName: "my-service-account",
 		},
 		Status: corev1.PodStatus{
 			Phase:     corev1.PodRunning,
@@ -463,6 +462,7 @@ func TestTransform(t *testing.T) {
 					},
 				},
 			},
+			ServiceAccountName: "my-service-account",
 		},
 		Status: corev1.PodStatus{
 			Phase: corev1.PodRunning,
@@ -480,103 +480,3 @@ func TestTransform(t *testing.T) {
 	}
 	assert.Equal(t, wantPod, Transform(originalPod))
 }
-
-func TestGetServiceNameForPod(t *testing.T) {
-	// Create a fake Kubernetes client
-	client := fake.NewSimpleClientset()
-
-	// Create a Pod with labels
-	pod := testutils.NewPodWithContainer(
-		"1",
-		testutils.NewPodSpecWithContainer("container-name"),
-		testutils.NewPodStatusWithContainer("container-name", containerIDWithPreifx("container-id")),
-	)
-
-	// Create a Service with the same labels as the Pod
-	service := &corev1.Service{
-		ObjectMeta: v1.ObjectMeta{
-			Name:      "test-service",
-			Namespace: "test-namespace",
-		},
-		Spec: corev1.ServiceSpec{
-			Selector: map[string]string{
-				"foo":  "bar",
-				"foo1": "",
-			},
-		},
-	}
-
-	// Create the Pod and Service in the fake client
-	_, err := client.CoreV1().Pods(pod.Namespace).Create(context.TODO(), pod, v1.CreateOptions{})
-	assert.NoError(t, err)
-
-	_, err = client.CoreV1().Services(service.Namespace).Create(context.TODO(), service, v1.CreateOptions{})
-	assert.NoError(t, err)
-
-	// Call the function
-	serviceName := getServiceNameForPod(client, pod)
-
-	// Verify the result
-	expectedServiceName := "test-service"
-
-	assert.Equal(t, expectedServiceName, serviceName)
-}
-
-func TestGetServiceAccountNameForPod(t *testing.T) {
-	// Create a fake Kubernetes client
-	client := fake.NewSimpleClientset()
-
-	// Create a Pod with labels
-	pod := testutils.NewPodWithContainer(
-		"1",
-		&corev1.PodSpec{
-			ServiceAccountName: "test-service-account",
-		},
-		testutils.NewPodStatusWithContainer("container-name", containerIDWithPreifx("container-id")),
-	)
-
-	// Create the Pod in the fake client
-	_, err := client.CoreV1().Pods(pod.Namespace).Create(context.TODO(), pod, v1.CreateOptions{})
-	assert.NoError(t, err)
-
-	// Call the function
-	serviceAccountName := getServiceAccountNameForPod(client, pod)
-
-	// Verify the result
-	expectedServiceAccountName := "test-service-account"
-
-	assert.Equal(t, expectedServiceAccountName, serviceAccountName)
-}
-
-func TestGetJobInfoForPod(t *testing.T) {
-	// Create a fake Kubernetes client
-	client := fake.NewSimpleClientset()
-
-	// Create a Pod with labels
-	pod := testutils.NewPodWithContainer(
-		"1",
-		testutils.NewPodSpecWithContainer("container-name"),
-		testutils.NewPodStatusWithContainer("container-name", containerIDWithPreifx("container-id")),
-	)
-
-	// Create a Job with the same labels as the Pod
-	job := testutils.NewJob("1")
-
-	// Create the Pod and Job in the fake client
-	_, err := client.CoreV1().Pods(pod.Namespace).Create(context.TODO(), pod, v1.CreateOptions{})
-	assert.NoError(t, err)
-
-	_, err = client.BatchV1().Jobs(job.Namespace).Create(context.TODO(), job, v1.CreateOptions{})
-	assert.NoError(t, err)
-
-	// Call the function
-	jobInfo := getJobInfoForPod(client, pod)
-
-	// Verify the result
-	expectedJobInfo := JobInfo{
-		Name: "test-job-1",
-		UID:  job.UID,
-	}
-
-	assert.Equal(t, expectedJobInfo, jobInfo)
-}

receiver/k8sclusterreceiver/internal/service/service.go

@@ -3,12 +3,10 @@
 
 package service // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/k8sclusterreceiver/internal/service"
 import (
-	"context"
 	"fmt"
-	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/k8sconfig"
+
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	corev1 "k8s.io/api/core/v1"
-	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/client-go/tools/cache"
 
@@ -23,7 +21,10 @@ func Transform(service *corev1.Service) *corev1.Service {
 	return &corev1.Service{
 		ObjectMeta: metadata.TransformObjectMeta(service.ObjectMeta),
 		Spec: corev1.ServiceSpec{
-			Selector: service.Spec.Selector,
+			Selector:  service.Spec.Selector,
+			ClusterIP: service.Spec.ClusterIP,
+			Type:      service.Spec.Type,
+			Ports:     service.Spec.Ports,
 		},
 	}
 }
@@ -44,33 +45,14 @@ func GetPodServiceTags(pod *corev1.Pod, services cache.Store) map[string]string
 }
 
 func RecordMetrics(mb *imetadata.MetricsBuilder, svc *corev1.Service, ts pcommon.Timestamp) {
-	svcDetails := GetServiceDetails(svc)
-	mb.RecordK8sServicePortCountDataPoint(ts, int64(len(svcDetails.Spec.Ports)))
+	mb.RecordK8sServicePortCountDataPoint(ts, int64(len(svc.Spec.Ports)))
 
 	rb := mb.NewResourceBuilder()
 	rb.SetK8sServiceUID(string(svc.UID))
 	rb.SetK8sServiceName(svc.ObjectMeta.Name)
 	rb.SetK8sServiceNamespace(svc.ObjectMeta.Namespace)
-	rb.SetK8sServiceClusterIP(svcDetails.Spec.ClusterIP)
-	rb.SetK8sServiceType(string(svcDetails.Spec.Type))
-	rb.SetK8sServiceClusterIP(svcDetails.Spec.ClusterIP)
+	rb.SetK8sServiceClusterIP(svc.Spec.ClusterIP)
+	rb.SetK8sServiceType(string(svc.Spec.Type))
 	rb.SetK8sClusterName("unknown")
 	mb.EmitForResource(metadata.WithResource(rb.Emit()))
 }
-
-func GetServiceDetails(svc *corev1.Service) *corev1.Service {
-	var svcObject *corev1.Service
-
-	client, _ := k8sconfig.MakeClient(k8sconfig.APIConfig{
-		AuthType: k8sconfig.AuthTypeServiceAccount,
-	})
-
-	service, err := client.CoreV1().Services(svc.ObjectMeta.Namespace).Get(context.TODO(), svc.ObjectMeta.Name, v1.GetOptions{})
-	if err != nil {
-		panic(err)
-	} else {
-		svcObject = service
-	}
-
-	return svcObject
-}