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Merge pull request #75303 from obitech/fix_golint_failures_pkg_kubelet

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Fix golint failures in some pkg/kubelet packages
This commit is contained in:
Kubernetes Prow Robot 2019-08-05 15:07:50 -07:00 committed by GitHub
commit cea34cc1a5
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GPG Key ID: 4AEE18F83AFDEB23
13 changed files with 98 additions and 31 deletions
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1
hack/.golint_failures
View File

@ -129,7 +129,6 @@ pkg/kubelet/dockershim/network/kubenet
pkg/kubelet/dockershim/network/testing
pkg/kubelet/events
pkg/kubelet/lifecycle
pkg/kubelet/metrics
pkg/kubelet/pluginmanager/pluginwatcher
pkg/kubelet/pod/testing
pkg/kubelet/preemption

1
pkg/kubelet/config/apiserver.go
View File

@ -14,7 +14,6 @@ See the License for the specific language governing permissions and
limitations under the License.
*/
// Reads the pod configuration from the Kubernetes apiserver.
package config
import (

3
pkg/kubelet/config/common.go
View File

@ -14,7 +14,6 @@ See the License for the specific language governing permissions and
limitations under the License.
*/
// Common logic used by both http and file channels.
package config
import (
@ -30,6 +29,7 @@ import (
utilyaml "k8s.io/apimachinery/pkg/util/yaml"
api "k8s.io/kubernetes/pkg/apis/core"
"k8s.io/kubernetes/pkg/apis/core/helper"
// TODO: remove this import if
// api.Registry.GroupOrDie(v1.GroupName).GroupVersion.String() is changed
// to "v1"?
@ -110,6 +110,7 @@ func getSelfLink(name, namespace string) string {
type defaultFunc func(pod *api.Pod) error
// tryDecodeSinglePod takes data and tries to extract valid Pod config information from it.
func tryDecodeSinglePod(data []byte, defaultFn defaultFunc) (parsed bool, pod *v1.Pod, err error) {
// JSON is valid YAML, so this should work for everything.
json, err := utilyaml.ToJSON(data)

1
pkg/kubelet/config/defaults.go
View File

@ -16,6 +16,7 @@ limitations under the License.
package config
// Defines sane defaults for the kubelet config.
const (
DefaultKubeletPodsDirName = "pods"
DefaultKubeletVolumesDirName = "volumes"

5
pkg/kubelet/config/file.go
View File

@ -14,7 +14,6 @@ See the License for the specific language governing permissions and
limitations under the License.
*/
// Reads the pod configuration from file or a directory of files.
package config
import (
@ -60,6 +59,7 @@ type sourceFile struct {
watchEvents chan *watchEvent
}
// NewSourceFile watches a config file for changes.
func NewSourceFile(path string, nodeName types.NodeName, period time.Duration, updates chan<- interface{}) {
// "github.com/sigma/go-inotify" requires a path without trailing "/"
path = strings.TrimRight(path, string(os.PathSeparator))
@ -196,6 +196,7 @@ func (s *sourceFile) extractFromDir(name string) ([]*v1.Pod, error) {
return pods, nil
}
// extractFromFile parses a file for Pod configuration information.
func (s *sourceFile) extractFromFile(filename string) (pod *v1.Pod, err error) {
klog.V(3).Infof("Reading config file %q", filename)
defer func() {
@ -232,7 +233,7 @@ func (s *sourceFile) extractFromFile(filename string) (pod *v1.Pod, err error) {
return pod, nil
}
return pod, fmt.Errorf("%v: couldn't parse as pod(%v), please check config file.\n", filename, podErr)
return pod, fmt.Errorf("%v: couldn't parse as pod(%v), please check config file", filename, podErr)
}
func (s *sourceFile) replaceStore(pods ...*v1.Pod) (err error) {

16
pkg/kubelet/config/file_linux.go
View File

@ -16,7 +16,6 @@ See the License for the specific language governing permissions and
limitations under the License.
*/
// Reads the pod configuration from file or a directory of files.
package config
import (
@ -50,17 +49,17 @@ func (e *retryableError) Error() string {
func (s *sourceFile) startWatch() {
backOff := flowcontrol.NewBackOff(retryPeriod, maxRetryPeriod)
backOffId := "watch"
backOffID := "watch"
go wait.Forever(func() {
if backOff.IsInBackOffSinceUpdate(backOffId, time.Now()) {
if backOff.IsInBackOffSinceUpdate(backOffID, time.Now()) {
return
}
if err := s.doWatch(); err != nil {
klog.Errorf("Unable to read config path %q: %v", s.path, err)
if _, retryable := err.(*retryableError); !retryable {
backOff.Next(backOffId, time.Now())
backOff.Next(backOffID, time.Now())
}
}
}, retryPeriod)
@ -130,11 +129,11 @@ func (s *sourceFile) produceWatchEvent(e *fsnotify.Event) error {
func (s *sourceFile) consumeWatchEvent(e *watchEvent) error {
switch e.eventType {
case podAdd, podModify:
if pod, err := s.extractFromFile(e.fileName); err != nil {
pod, err := s.extractFromFile(e.fileName)
if err != nil {
return fmt.Errorf("can't process config file %q: %v", e.fileName, err)
} else {
return s.store.Add(pod)
}
return s.store.Add(pod)
case podDelete:
if objKey, keyExist := s.fileKeyMapping[e.fileName]; keyExist {
pod, podExist, err := s.store.GetByKey(objKey)
@ -145,9 +144,8 @@ func (s *sourceFile) consumeWatchEvent(e *watchEvent) error {
} else {
if err = s.store.Delete(pod); err != nil {
return fmt.Errorf("failed to remove deleted pod from cache: %v", err)
} else {
delete(s.fileKeyMapping, e.fileName)
}
delete(s.fileKeyMapping, e.fileName)
}
}
}

1
pkg/kubelet/config/file_unsupported.go
View File

@ -16,7 +16,6 @@ See the License for the specific language governing permissions and
limitations under the License.
*/
// Reads the pod configuration from file or a directory of files.
package config
import (

5
pkg/kubelet/config/flags.go
View File

@ -23,9 +23,9 @@ import (
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// ContainerRuntimeOptions defines options for the container runtime.
type ContainerRuntimeOptions struct {
// General options.
// General Options.
// ContainerRuntime is the container runtime to use.
ContainerRuntime string
@ -78,6 +78,7 @@ type ContainerRuntimeOptions struct {
CNICacheDir string
}
// AddFlags adds flags to the container runtime, according to ContainerRuntimeOptions.
func (s *ContainerRuntimeOptions) AddFlags(fs *pflag.FlagSet) {
dockerOnlyWarning := "This docker-specific flag only works when container-runtime is set to docker."

2
pkg/kubelet/config/http.go
View File

@ -14,7 +14,6 @@ See the License for the specific language governing permissions and
limitations under the License.
*/
// Reads the pod configuration from an HTTP GET response.
package config
import (
@ -43,6 +42,7 @@ type sourceURL struct {
client *http.Client
}
// NewSourceURL specifies the URL where to read the Pod configuration from, then watches it for changes.
func NewSourceURL(url string, header http.Header, nodeName types.NodeName, period time.Duration, updates chan<- interface{}) {
config := &sourceURL{
url: url,

2
pkg/kubelet/configmap/configmap_manager.go
View File

@ -20,7 +20,7 @@ import (
"fmt"
"time"
"k8s.io/api/core/v1"
v1 "k8s.io/api/core/v1"
clientset "k8s.io/client-go/kubernetes"
podutil "k8s.io/kubernetes/pkg/api/v1/pod"
corev1 "k8s.io/kubernetes/pkg/apis/core/v1"

4
pkg/kubelet/configmap/fake_manager.go
View File

@ -16,9 +16,7 @@ limitations under the License.
package configmap
import (
"k8s.io/api/core/v1"
)
import v1 "k8s.io/api/core/v1"
// fakeManager implements Manager interface for testing purposes.
// simple operations to apiserver.

84
pkg/kubelet/metrics/metrics.go
View File

@ -30,6 +30,7 @@ import (
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
)
// This const block defines the metric names for the kubelet metrics.
const (
KubeletSubsystem = "kubelet"
NodeNameKey = "node_name"
@ -85,6 +86,7 @@ const (
)
var (
// NodeName is a Gauge that tracks the ode's name. The count is always 1.
NodeName = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Subsystem: KubeletSubsystem,
@ -93,6 +95,7 @@ var (
},
[]string{NodeLabelKey},
)
// ContainersPerPodCount is a Counter that tracks the number of containers per pod.
ContainersPerPodCount = prometheus.NewHistogram(
prometheus.HistogramOpts{
Subsystem: KubeletSubsystem,
@ -101,6 +104,8 @@ var (
Buckets: prometheus.DefBuckets,
},
)
// PodWorkerDuration is a Histogram that tracks the duration (in seconds) in takes to sync a single pod.
// Broken down by the operation type.
PodWorkerDuration = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Subsystem: KubeletSubsystem,
@ -110,6 +115,7 @@ var (
},
[]string{"operation_type"},
)
// PodStartDuration is a Histogram that tracks the duration (in seconds) it takes for a single pod to go from pending to running.
PodStartDuration = prometheus.NewHistogram(
prometheus.HistogramOpts{
Subsystem: KubeletSubsystem,
@ -118,6 +124,8 @@ var (
Buckets: prometheus.DefBuckets,
},
)
// CgroupManagerDuration is a Histogram that tracks the duration (in seconds) it takes for cgroup manager operations to complete.
// Broken down by method.
CgroupManagerDuration = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Subsystem: KubeletSubsystem,
@ -127,6 +135,7 @@ var (
},
[]string{"operation_type"},
)
// PodWorkerStartDuration is a Histogram that tracks the duration (in seconds) it takes from seeing a pod to starting a worker.
PodWorkerStartDuration = prometheus.NewHistogram(
prometheus.HistogramOpts{
Subsystem: KubeletSubsystem,
@ -135,6 +144,8 @@ var (
Buckets: prometheus.DefBuckets,
},
)
// PLEGRelistDuration is a Histogram that tracks the duration (in seconds) it takes for relisting pods in the Kubelet's
// Pod Lifecycle Event Generator (PLEG).
PLEGRelistDuration = prometheus.NewHistogram(
prometheus.HistogramOpts{
Subsystem: KubeletSubsystem,
@ -143,6 +154,8 @@ var (
Buckets: prometheus.DefBuckets,
},
)
// PLEGDiscardEvents is a Histogram that tracks the duration (in seconds) it takes for discarding events in the Kubelet's
// Pod Lifecycle Event Generator (PLEG).
PLEGDiscardEvents = prometheus.NewCounterVec(
prometheus.CounterOpts{
Subsystem: KubeletSubsystem,
@ -151,6 +164,8 @@ var (
},
[]string{},
)
// PLEGRelistInterval is a Histogram that tracks the intervals (in seconds) between relisting in the Kubelet's
// Pod Lifecycle Event Generator (PLEG).
PLEGRelistInterval = prometheus.NewHistogram(
prometheus.HistogramOpts{
Subsystem: KubeletSubsystem,
@ -159,7 +174,8 @@ var (
Buckets: prometheus.DefBuckets,
},
)
// Metrics of remote runtime operations.
// RuntimeOperations is a Counter that tracks the cumulative number of remote runtime operations.
// Broken down by operation type.
RuntimeOperations = prometheus.NewCounterVec(
prometheus.CounterOpts{
Subsystem: KubeletSubsystem,
@ -168,6 +184,8 @@ var (
},
[]string{"operation_type"},
)
// RuntimeOperationsDuration is a Histogram that tracks the duration (in seconds) for remote runtime operations to complete.
// Broken down by operation type.
RuntimeOperationsDuration = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Subsystem: KubeletSubsystem,
@ -177,6 +195,8 @@ var (
},
[]string{"operation_type"},
)
// RuntimeOperationsErrors is a Counter that tracks the cumulative number of remote runtime operations errors.
// Broken down by operation type.
RuntimeOperationsErrors = prometheus.NewCounterVec(
prometheus.CounterOpts{
Subsystem: KubeletSubsystem,
@ -185,6 +205,8 @@ var (
},
[]string{"operation_type"},
)
// EvictionStatsAge is a Histogram that tracks the time (in seconds) between when stats are collected and when a pod is evicted
// based on those stats. Broken down by eviction signal.
EvictionStatsAge = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Subsystem: KubeletSubsystem,
@ -194,6 +216,8 @@ var (
},
[]string{"eviction_signal"},
)
// DevicePluginRegistrationCount is a Counter that tracks the cumulative number of device plugin registrations.
// Broken down by resource name.
DevicePluginRegistrationCount = prometheus.NewCounterVec(
prometheus.CounterOpts{
Subsystem: KubeletSubsystem,
@ -202,6 +226,8 @@ var (
},
[]string{"resource_name"},
)
// DevicePluginAllocationDuration is a Histogram that tracks the duration (in seconds) to serve a device plugin allocation request.
// Broken down by resource name.
DevicePluginAllocationDuration = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Subsystem: KubeletSubsystem,
@ -211,7 +237,8 @@ var (
},
[]string{"resource_name"},
)
// DeprecatedPodWorkerLatency is a Summary that tracks the latency (in microseconds) to sync a single pod.
// Broken down by operation type. This metric is deprecated.
DeprecatedPodWorkerLatency = prometheus.NewSummaryVec(
prometheus.SummaryOpts{
Subsystem: KubeletSubsystem,
@ -220,6 +247,8 @@ var (
},
[]string{"operation_type"},
)
// DeprecatedPodStartLatency is a Summary that tracks the latency (in microseconds) for a single pod to go from pending to running.
// This metric is deprecated.
DeprecatedPodStartLatency = prometheus.NewSummary(
prometheus.SummaryOpts{
Subsystem: KubeletSubsystem,
@ -227,6 +256,8 @@ var (
Help: "(Deprecated) Latency in microseconds for a single pod to go from pending to running.",
},
)
// DeprecatedCgroupManagerLatency is a Summary that tracks the latency (in microseconds) for cgroup manager operations to complete.
// Broken down by operation type. This metric is deprecated.
DeprecatedCgroupManagerLatency = prometheus.NewSummaryVec(
prometheus.SummaryOpts{
Subsystem: KubeletSubsystem,
@ -235,6 +266,8 @@ var (
},
[]string{"operation_type"},
)
// DeprecatedPodWorkerStartLatency is a Summary that tracks the latency (in microseconds) from seeing a pod to starting a worker.
// This metric is deprecated.
DeprecatedPodWorkerStartLatency = prometheus.NewSummary(
prometheus.SummaryOpts{
Subsystem: KubeletSubsystem,
@ -242,6 +275,8 @@ var (
Help: "(Deprecated) Latency in microseconds from seeing a pod to starting a worker.",
},
)
// DeprecatedPLEGRelistLatency is a Summary that tracks the latency (in microseconds) for relisting pods in PLEG.
// This metric is deprecated.
DeprecatedPLEGRelistLatency = prometheus.NewSummary(
prometheus.SummaryOpts{
Subsystem: KubeletSubsystem,
@ -249,6 +284,8 @@ var (
Help: "(Deprecated) Latency in microseconds for relisting pods in PLEG.",
},
)
// DeprecatedPLEGRelistInterval is a Summary that tracks the interval (in microseconds) between relistings in PLEG.
// This metric is deprecated.
DeprecatedPLEGRelistInterval = prometheus.NewSummary(
prometheus.SummaryOpts{
Subsystem: KubeletSubsystem,
@ -256,6 +293,8 @@ var (
Help: "(Deprecated) Interval in microseconds between relisting in PLEG.",
},
)
// DeprecatedRuntimeOperations is a Counter that tracks the cumulative number of remote runtime operations.
// Broken down by operation type. This metric is deprecated.
DeprecatedRuntimeOperations = prometheus.NewCounterVec(
prometheus.CounterOpts{
Subsystem: KubeletSubsystem,
@ -264,6 +303,8 @@ var (
},
[]string{"operation_type"},
)
// DeprecatedRuntimeOperationsLatency is a Summary that tracks the latency (in microseconds) of remote runtime operations
// to complete. Broken down by operation type. This metric is deprecated.
DeprecatedRuntimeOperationsLatency = prometheus.NewSummaryVec(
prometheus.SummaryOpts{
Subsystem: KubeletSubsystem,
@ -272,6 +313,8 @@ var (
},
[]string{"operation_type"},
)
// DeprecatedRuntimeOperationsErrors is a Counter that tracks the cumulative number of remote runtime operation errors.
// Broken down by operation type. This metric is deprecated.
DeprecatedRuntimeOperationsErrors = prometheus.NewCounterVec(
prometheus.CounterOpts{
Subsystem: KubeletSubsystem,
@ -280,6 +323,8 @@ var (
},
[]string{"operation_type"},
)
// DeprecatedEvictionStatsAge is a Summary that tracks the time (in microseconds) between when stats are collected and when a pod
// is evicted based on those stats. Broken down by eviction signal. This metric is deprecated.
DeprecatedEvictionStatsAge = prometheus.NewSummaryVec(
prometheus.SummaryOpts{
Subsystem: KubeletSubsystem,
@ -288,6 +333,8 @@ var (
},
[]string{"eviction_signal"},
)
// DeprecatedDevicePluginRegistrationCount is a Counter that tracks the cumulative number of device plugin registrations.
// Broken down by resource name. This metric is deprecated.
DeprecatedDevicePluginRegistrationCount = prometheus.NewCounterVec(
prometheus.CounterOpts{
Subsystem: KubeletSubsystem,
@ -296,6 +343,8 @@ var (
},
[]string{"resource_name"},
)
// DeprecatedDevicePluginAllocationLatency is a Summary that tracks the latncy (in microseconds) for serving device plugin allocation requests.
// Broken down by resource name. This metric is deprecated.
DeprecatedDevicePluginAllocationLatency = prometheus.NewSummaryVec(
prometheus.SummaryOpts{
Subsystem: KubeletSubsystem,
@ -307,6 +356,7 @@ var (
// Metrics for node config
// AssignedConfig is a Gauge that is set 1 if the Kubelet has a NodeConfig assigned.
AssignedConfig = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Subsystem: KubeletSubsystem,
@ -315,6 +365,7 @@ var (
},
[]string{ConfigSourceLabelKey, ConfigUIDLabelKey, ConfigResourceVersionLabelKey, KubeletConfigKeyLabelKey},
)
// ActiveConfig is a Gauge that is set to 1 if the Kubelet has an active NodeConfig.
ActiveConfig = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Subsystem: KubeletSubsystem,
@ -323,6 +374,8 @@ var (
},
[]string{ConfigSourceLabelKey, ConfigUIDLabelKey, ConfigResourceVersionLabelKey, KubeletConfigKeyLabelKey},
)
// LastKnownGoodConfig is a Gauge that is set to 1 if the Kubelet has a NodeConfig it can fall back to if there
// are certain errors.
LastKnownGoodConfig = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Subsystem: KubeletSubsystem,
@ -331,6 +384,7 @@ var (
},
[]string{ConfigSourceLabelKey, ConfigUIDLabelKey, ConfigResourceVersionLabelKey, KubeletConfigKeyLabelKey},
)
// ConfigError is a Gauge that is set to 1 if the node is experiencing a configuration-related error.
ConfigError = prometheus.NewGauge(
prometheus.GaugeOpts{
Subsystem: KubeletSubsystem,
@ -338,6 +392,8 @@ var (
Help: "This metric is true (1) if the node is experiencing a configuration-related error, false (0) otherwise.",
},
)
// RunPodSandboxDuration is a Histogram that tracks the duration (in seconds) it takes to run Pod Sandbox operations.
// Broken down by RuntimeClass.
RunPodSandboxDuration = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Subsystem: KubeletSubsystem,
@ -348,6 +404,8 @@ var (
},
[]string{"runtime_handler"},
)
// RunPodSandboxErrors is a Counter that tracks the cumulative number of Pod Sandbox operations errors.
// Broken down by RuntimeClass.
RunPodSandboxErrors = prometheus.NewCounterVec(
prometheus.CounterOpts{
Subsystem: KubeletSubsystem,
@ -360,7 +418,7 @@ var (
var registerMetrics sync.Once
// Register all metrics.
// Register registers all metrics.
func Register(containerCache kubecontainer.RuntimeCache, collectors ...prometheus.Collector) {
// Register the metrics.
registerMetrics.Do(func() {
@ -404,7 +462,7 @@ func Register(containerCache kubecontainer.RuntimeCache, collectors ...prometheu
})
}
// Gets the time since the specified start in microseconds.
// SinceInMicroseconds gets the time since the specified start in microseconds.
func SinceInMicroseconds(start time.Time) float64 {
return float64(time.Since(start).Nanoseconds() / time.Microsecond.Nanoseconds())
}
@ -438,11 +496,15 @@ var (
nil, nil)
)
// Describe implements Prometheus' Describe method from the Collector interface. It sends all
// available descriptions to the provided channel and retunrs once the last description has been sent.
func (pc *podAndContainerCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- runningPodCountDesc
ch <- runningContainerCountDesc
}
// Collect implements Prometheus' Collect method from the Collector interface. It's called by the Prometheus
// registry when collecting metrics.
func (pc *podAndContainerCollector) Collect(ch chan<- prometheus.Metric) {
runningPods, err := pc.containerCache.GetPods()
if err != nil {
@ -488,8 +550,10 @@ func configLabels(source *corev1.NodeConfigSource) (map[string]string, error) {
}
// track labels across metric updates, so we can delete old label sets and prevent leaks
var assignedConfigLabels map[string]string = map[string]string{}
var assignedConfigLabels map[string]string
// SetAssignedConfig tracks labels according to the assigned NodeConfig. It also tracks labels
// across metric updates so old labels can be safely deleted.
func SetAssignedConfig(source *corev1.NodeConfigSource) error {
// compute the timeseries labels from the source
labels, err := configLabels(source)
@ -508,8 +572,10 @@ func SetAssignedConfig(source *corev1.NodeConfigSource) error {
}
// track labels across metric updates, so we can delete old label sets and prevent leaks
var activeConfigLabels map[string]string = map[string]string{}
var activeConfigLabels map[string]string
// SetActiveConfig tracks labels according to the NodeConfig that is currently used by the Kubelet.
// It also tracks labels across metric updates so old labels can be safely deleted.
func SetActiveConfig(source *corev1.NodeConfigSource) error {
// compute the timeseries labels from the source
labels, err := configLabels(source)
@ -528,8 +594,10 @@ func SetActiveConfig(source *corev1.NodeConfigSource) error {
}
// track labels across metric updates, so we can delete old label sets and prevent leaks
var lastKnownGoodConfigLabels map[string]string = map[string]string{}
var lastKnownGoodConfigLabels map[string]string
// SetLastKnownGoodConfig tracks labels according to the NodeConfig that was successfully applied last.
// It also tracks labels across metric updates so old labels can be safely deleted.
func SetLastKnownGoodConfig(source *corev1.NodeConfigSource) error {
// compute the timeseries labels from the source
labels, err := configLabels(source)
@ -547,6 +615,7 @@ func SetLastKnownGoodConfig(source *corev1.NodeConfigSource) error {
return nil
}
// SetConfigError sets a the ConfigError metric to 1 in case any errors were encountered.
func SetConfigError(err bool) {
if err {
ConfigError.Set(1)
@ -555,6 +624,7 @@ func SetConfigError(err bool) {
}
}
// SetNodeName sets the NodeName Gauge to 1.
func SetNodeName(name types.NodeName) {
NodeName.WithLabelValues(string(name)).Set(1)
}

4
pkg/kubelet/pod/mirror_client.go
View File

@ -105,13 +105,13 @@ func (mc *basicMirrorClient) DeleteMirrorPod(podFullName string, uid *types.UID)
return true, nil
}
// IsStaticPod returns true if the pod is a static pod.
// IsStaticPod returns true if the passed Pod is static.
func IsStaticPod(pod *v1.Pod) bool {
source, err := kubetypes.GetPodSource(pod)
return err == nil && source != kubetypes.ApiserverSource
}
// IsMirrorPod returns true if the pod is a mirror pod.
// IsMirrorPod returns true if the passed Pod is a Mirror Pod.
func IsMirrorPod(pod *v1.Pod) bool {
_, ok := pod.Annotations[kubetypes.ConfigMirrorAnnotationKey]
return ok