var (
	ImagePullLatency = prometheus.NewSummary(
		prometheus.SummaryOpts{
			Subsystem: kubeletSubsystem,
			Name:      "image_pull_latency_microseconds",
			Help:      "Image pull latency in microseconds.",
		},
	)
	ContainersPerPodCount = prometheus.NewSummary(
		prometheus.SummaryOpts{
			Subsystem: kubeletSubsystem,
			Name:      "containers_per_pod_count",
			Help:      "The number of containers per pod.",
		},
	)
	SyncPodLatency = prometheus.NewSummaryVec(
		prometheus.SummaryOpts{
			Subsystem: kubeletSubsystem,
			Name:      "sync_pod_latency_microseconds",
			Help:      "Latency in microseconds to sync a single pod. Broken down by operation type: create, update, or sync",
		},
		[]string{"operation_type"},
	)
	SyncPodsLatency = prometheus.NewSummary(
		prometheus.SummaryOpts{
			Subsystem: kubeletSubsystem,
			Name:      "sync_pods_latency_microseconds",
			Help:      "Latency in microseconds to sync all pods.",
		},
	)
	DockerOperationsLatency = prometheus.NewSummaryVec(
		prometheus.SummaryOpts{
			Subsystem: kubeletSubsystem,
			Name:      "docker_operations_latency_microseconds",
			Help:      "Latency in microseconds of Docker operations. Broken down by operation type.",
		},
		[]string{"operation_type"},
	)
)

type SyncPodType int

const (
	SyncPodCreate SyncPodType = iota
	SyncPodUpdate
	SyncPodSync
)