Fix linter errors

kubernetes/metadata/namespace.go

@@ -43,10 +43,12 @@ func NewNamespaceMetadataGenerator(cfg *config.C, namespaces cache.Store, client
 
 // Generate generates pod metadata from a resource object
 // Metadata map is in the following form:
-// {
-// 	  "kubernetes": {},
-//    "some.ecs.field": "asdf"
-// }
+//
+//	{
+//		  "kubernetes": {},
+//	   "some.ecs.field": "asdf"
+//	}
+//
 // All Kubernetes fields that need to be stored under kuberentes. prefix are populetad by
 // GenerateK8s method while fields that are part of ECS are generated by GenerateECS method
 func (n *namespace) Generate(obj kubernetes.Resource, opts ...FieldOptions) mapstr.M {

kubernetes/metadata/node.go

@@ -42,10 +42,12 @@ func NewNodeMetadataGenerator(cfg *config.C, nodes cache.Store, client k8s.Inter
 
 // Generate generates node metadata from a resource object
 // Metadata map is in the following form:
-// {
-// 	  "kubernetes": {},
-//    "some.ecs.field": "asdf"
-// }
+//
+//	{
+//		  "kubernetes": {},
+//	   "some.ecs.field": "asdf"
+//	}
+//
 // All Kubernetes fields that need to be stored under kuberentes. prefix are populetad by
 // GenerateK8s method while fields that are part of ECS are generated by GenerateECS method
 func (n *node) Generate(obj kubernetes.Resource, opts ...FieldOptions) mapstr.M {

kubernetes/util.go

@@ -21,7 +21,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 
@@ -200,7 +199,7 @@ func (hd *DefaultDiscoveryUtils) GetMachineID() string {
 		"/etc/machine-id",
 		"/var/lib/dbus/machine-id",
 	} {
-		id, err := ioutil.ReadFile(file)
+		id, err := os.ReadFile(file)
 		if err == nil {
 			return strings.TrimSpace(string(id))
 		}
@@ -221,7 +220,7 @@ func (hd *DefaultDiscoveryUtils) GetPodName() (string, error) {
 // InClusterNamespace gets namespace from serviceaccount when beat is in cluster. // code borrowed from client-go with some changes.
 func InClusterNamespace() (string, error) {
 	// get namespace associated with the service account token, if available
-	data, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace")
+	data, err := os.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace")
 	if err != nil {
 		return "", err
 	}

kubernetes/watcher.go

@@ -145,7 +145,7 @@ func NewNamedWatcher(name string, client kubernetes.Interface, resource Resource
 		handler:      NoOpEventHandlerFuncs{},
 	}
 
-	w.informer.AddEventHandler(cache.ResourceEventHandlerFuncs{
+	_, err = w.informer.AddEventHandler(cache.ResourceEventHandlerFuncs{
 		AddFunc: func(o interface{}) {
 			w.enqueue(o, add)
 		},
@@ -175,6 +175,9 @@ func NewNamedWatcher(name string, client kubernetes.Interface, resource Resource
 			}
 		},
 	})
+	if err != nil {
+		return nil, err
+	}
 
 	return w, nil
 }