[processor/resourcedetection] Add k8s cluster name detection in EKS environment (#28649)

**Description:** 
This enhancement detects the k8s cluster name in EKS. The solution uses
EC2 instance tags to determine the cluster name, which means it will
only work on EC2 (as noted in documentation updates).

Resolves #26794

---------

Co-authored-by: bryan-aguilar <[email protected]>

Author: crobert-1

.chloggen/eks_cluster_name.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# 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: resourcedetectionprocessor
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add k8s cluster name detection when running in EKS
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [26794]
+
+# (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:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

processor/resourcedetectionprocessor/README.md

@@ -318,14 +318,18 @@ processors:
 
     * cloud.provider ("aws")
     * cloud.platform ("aws_eks")
+    * k8s.cluster.name
+
+Note: The kubernetes cluster name is only available when running on EC2 instances, and requires permission to run the `EC2:DescribeInstances` [action](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeInstances.html).
+If you see an error with the message `context deadline exceeded`, please increase the timeout setting in your config.
 
 Example:
 
 ```yaml
 processors:
   resourcedetection/eks:
     detectors: [env, eks]
-    timeout: 2s
+    timeout: 15s
     override: false
 ```
 

processor/resourcedetectionprocessor/internal/aws/eks/detector.go

@@ -7,7 +7,12 @@ import (
 	"context"
 	"fmt"
 	"os"
+	"strings"
 
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/ec2metadata"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/ec2"
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/processor"
 	conventions "go.opentelemetry.io/collector/semconv/v1.6.1"
@@ -28,10 +33,16 @@ const (
 	kubernetesServiceHostEnvVar = "KUBERNETES_SERVICE_HOST"
 	authConfigmapNS             = "kube-system"
 	authConfigmapName           = "aws-auth"
+
+	clusterNameAwsEksTag     = "aws:eks:cluster-name"
+	clusterNameEksTag        = "eks:cluster-name"
+	kubernetesClusterNameTag = "kubernetes.io/cluster/"
 )
 
 type detectorUtils interface {
 	getConfigMap(ctx context.Context, namespace string, name string) (map[string]string, error)
+	getClusterName(ctx context.Context, logger *zap.Logger) string
+	getClusterNameTagFromReservations([]*ec2.Reservation) string
 }
 
 type eksDetectorUtils struct {
@@ -43,6 +54,7 @@ type detector struct {
 	utils  detectorUtils
 	logger *zap.Logger
 	err    error
+	ra     metadata.ResourceAttributesConfig
 	rb     *metadata.ResourceBuilder
 }
 
@@ -54,10 +66,12 @@ var _ detectorUtils = (*eksDetectorUtils)(nil)
 func NewDetector(set processor.CreateSettings, dcfg internal.DetectorConfig) (internal.Detector, error) {
 	cfg := dcfg.(Config)
 	utils, err := newK8sDetectorUtils()
+
 	return &detector{
 		utils:  utils,
 		logger: set.Logger,
 		err:    err,
+		ra:     cfg.ResourceAttributes,
 		rb:     metadata.NewResourceBuilder(cfg.ResourceAttributes),
 	}, nil
 }
@@ -74,6 +88,11 @@ func (d *detector) Detect(ctx context.Context) (resource pcommon.Resource, schem
 	d.rb.SetCloudProvider(conventions.AttributeCloudProviderAWS)
 	d.rb.SetCloudPlatform(conventions.AttributeCloudPlatformAWSEKS)
 
+	if d.ra.K8sClusterName.Enabled {
+		clusterName := d.utils.getClusterName(ctx, d.logger)
+		d.rb.SetK8sClusterName(clusterName)
+	}
+
 	return d.rb.Emit(), conventions.SchemaURL, nil
 }
 
@@ -114,3 +133,64 @@ func (e eksDetectorUtils) getConfigMap(ctx context.Context, namespace string, na
 	}
 	return cm.Data, nil
 }
+
+func (e eksDetectorUtils) getClusterName(ctx context.Context, logger *zap.Logger) string {
+	defaultErrorMessage := "Unable to get EKS cluster name"
+	sess, err := session.NewSession()
+	if err != nil {
+		logger.Warn(defaultErrorMessage, zap.Error(err))
+		return ""
+	}
+
+	ec2Svc := ec2metadata.New(sess)
+	region, err := ec2Svc.Region()
+	if err != nil {
+		logger.Warn(defaultErrorMessage, zap.Error(err))
+		return ""
+	}
+
+	svc := ec2.New(sess, aws.NewConfig().WithRegion(region))
+	instanceIdentityDocument, err := ec2Svc.GetInstanceIdentityDocumentWithContext(ctx)
+	if err != nil {
+		logger.Warn(defaultErrorMessage, zap.Error(err))
+		return ""
+	}
+
+	instances, err := svc.DescribeInstances(&ec2.DescribeInstancesInput{
+		InstanceIds: []*string{
+			aws.String(instanceIdentityDocument.InstanceID),
+		},
+	})
+	if err != nil {
+		logger.Warn(defaultErrorMessage, zap.Error(err))
+		return ""
+	}
+
+	clusterName := e.getClusterNameTagFromReservations(instances.Reservations)
+	if len(clusterName) == 0 {
+		logger.Warn("Failed to detect EKS cluster name. No tag for cluster name found on EC2 instance")
+		return ""
+	}
+
+	return clusterName
+}
+
+func (e eksDetectorUtils) getClusterNameTagFromReservations(reservations []*ec2.Reservation) string {
+	for _, reservation := range reservations {
+		for _, instance := range reservation.Instances {
+			for _, tag := range instance.Tags {
+				if tag.Key == nil {
+					continue
+				}
+
+				if *tag.Key == clusterNameAwsEksTag || *tag.Key == clusterNameEksTag {
+					return *tag.Value
+				} else if strings.HasPrefix(*tag.Key, kubernetesClusterNameTag) {
+					return strings.TrimPrefix(*tag.Key, kubernetesClusterNameTag)
+				}
+			}
+		}
+	}
+
+	return ""
+}

processor/resourcedetectionprocessor/internal/aws/eks/detector_test.go

@@ -7,15 +7,21 @@ import (
 	"context"
 	"testing"
 
+	"github.com/aws/aws-sdk-go/service/ec2"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/collector/processor/processortest"
+	conventions "go.opentelemetry.io/collector/semconv/v1.6.1"
 	"go.uber.org/zap"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/resourcedetectionprocessor/internal/aws/eks/internal/metadata"
 )
 
+const (
+	clusterName = "my-cluster"
+)
+
 type MockDetectorUtils struct {
 	mock.Mock
 }
@@ -25,6 +31,15 @@ func (detectorUtils *MockDetectorUtils) getConfigMap(_ context.Context, namespac
 	return args.Get(0).(map[string]string), args.Error(1)
 }
 
+func (detectorUtils *MockDetectorUtils) getClusterName(_ context.Context, _ *zap.Logger) string {
+	var reservations []*ec2.Reservation
+	return detectorUtils.getClusterNameTagFromReservations(reservations)
+}
+
+func (detectorUtils *MockDetectorUtils) getClusterNameTagFromReservations(_ []*ec2.Reservation) string {
+	return clusterName
+}
+
 func TestNewDetector(t *testing.T) {
 	dcfg := CreateDefaultConfig()
 	detector, err := NewDetector(processortest.NewNopCreateSettings(), dcfg)
@@ -38,9 +53,9 @@ func TestEKS(t *testing.T) {
 	ctx := context.Background()
 
 	t.Setenv("KUBERNETES_SERVICE_HOST", "localhost")
-	detectorUtils.On("getConfigMap", authConfigmapNS, authConfigmapName).Return(map[string]string{"cluster.name": "my-cluster"}, nil)
+	detectorUtils.On("getConfigMap", authConfigmapNS, authConfigmapName).Return(map[string]string{conventions.AttributeK8SClusterName: clusterName}, nil)
 	// Call EKS Resource detector to detect resources
-	eksResourceDetector := &detector{utils: detectorUtils, err: nil, rb: metadata.NewResourceBuilder(metadata.DefaultResourceAttributesConfig())}
+	eksResourceDetector := &detector{utils: detectorUtils, err: nil, ra: metadata.DefaultResourceAttributesConfig(), rb: metadata.NewResourceBuilder(metadata.DefaultResourceAttributesConfig())}
 	res, _, err := eksResourceDetector.Detect(ctx)
 	require.NoError(t, err)
 

processor/resourcedetectionprocessor/internal/aws/eks/internal/metadata/generated_config.go

@@ -5,9 +5,13 @@ all_set:
       enabled: true
     cloud.provider:
       enabled: true
+    k8s.cluster.name:
+      enabled: true
 none_set:
   resource_attributes:
     cloud.platform:
       enabled: false
     cloud.provider:
       enabled: false
+    k8s.cluster.name:
+      enabled: false

processor/resourcedetectionprocessor/internal/aws/eks/internal/metadata/generated_config_test.go

@@ -10,4 +10,8 @@ resource_attributes:
   cloud.platform:
     description: The cloud.platform
     type: string
-    enabled: true
+    enabled: true
+  k8s.cluster.name:
+    description: The EKS cluster name. This attribute is currently only available when running on EC2 instances, and requires permission to run the EC2:DescribeInstances action.
+    type: string
+    enabled: false