Add k8s events support

Create k8s events when a pod is successfully evicted.

Fixes kubernetes-sigs#166.

pkg/descheduler/evictions/evictions.go

@@ -18,10 +18,13 @@ package evictions
 
 import (
 	"fmt"
+	"time"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/api/events/v1beta1"
 	policy "k8s.io/api/policy/v1beta1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	apimachinery "k8s.io/apimachinery/pkg/apis/meta/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	clientset "k8s.io/client-go/kubernetes"
 
@@ -47,7 +50,16 @@ func EvictPod(client clientset.Interface, pod *v1.Pod, policyGroupVersion string
 	}
 	err := client.Policy().Evictions(eviction.Namespace).Evict(eviction)
 
+	event := &v1beta1.Event{
+		EventTime: apimachinery.NewMicroTime(time.Now()),
+		Note:      "pod evicted by sigs.k8s.io/descheduler",
+		Reason:    "pod evictecd by sigs.k8s.io/descheduler",
+		Regarding: v1.ObjectReference{Kind: "pod", Namespace: pod.Namespace, Name: pod.Name},
+		Type:      "Normal",
+	}
+
 	if err == nil {
+		client.EventsV1beta1().Events(pod.Namespace).Create(event)
 		return true, nil
 	} else if apierrors.IsTooManyRequests(err) {
 		return false, fmt.Errorf("error when evicting pod (ignoring) %q: %v", pod.Name, err)