add an event for when a daemonset can't place a pod due to insufficent resource or port conflict

pkg/controller/daemon/controller.go

@@ -683,11 +683,13 @@ func (dsc *DaemonSetsController) nodeShouldRunDaemonPod(node *api.Node, ds *exte
 	}
 	_, notFittingCPU, notFittingMemory := predicates.CheckPodsExceedingFreeResources(pods, node.Status.Allocatable)
 	if len(notFittingCPU)+len(notFittingMemory) != 0 {
+		dsc.eventRecorder.Eventf(ds, api.EventTypeNormal, "FailedPlacement", "failed to place pod on %q: insufficent free resources", node.ObjectMeta.Name)
 		return false
 	}
 	ports := sets.String{}
 	for _, pod := range pods {
 		if errs := validation.AccumulateUniqueHostPorts(pod.Spec.Containers, &ports, field.NewPath("spec", "containers")); len(errs) > 0 {
+			dsc.eventRecorder.Eventf(ds, api.EventTypeNormal, "FailedPlacement", "failed to place pod on %q: host port conflict", node.ObjectMeta.Name)
 			return false
 		}
 	}