const (
	KubeletSubsystem              = "kubelet"
	PodWorkerLatencyKey           = "pod_worker_latency_microseconds"
	SyncPodsLatencyKey            = "sync_pods_latency_microseconds"
	PodStartLatencyKey            = "pod_start_latency_microseconds"
	PodStatusLatencyKey           = "generate_pod_status_latency_microseconds"
	ContainerManagerOperationsKey = "container_manager_latency_microseconds"
	DockerOperationsKey           = "docker_operations_latency_microseconds"
	DockerErrorsKey               = "docker_errors"
	PodWorkerStartLatencyKey      = "pod_worker_start_latency_microseconds"
)

var (
	ContainersPerPodCount = prometheus.NewSummary(
		prometheus.SummaryOpts{
			Subsystem: KubeletSubsystem,
			Name:      "containers_per_pod_count",
			Help:      "The number of containers per pod.",
		},
	)
	PodWorkerLatency = prometheus.NewSummaryVec(
		prometheus.SummaryOpts{
			Subsystem: KubeletSubsystem,
			Name:      PodWorkerLatencyKey,
			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:      SyncPodsLatencyKey,
			Help:      "Latency in microseconds to sync all pods.",
		},
	)
	PodStartLatency = prometheus.NewSummary(
		prometheus.SummaryOpts{
			Subsystem: KubeletSubsystem,
			Name:      PodStartLatencyKey,
			Help:      "Latency in microseconds for a single pod to go from pending to running. Broken down by podname.",
		},
	)
	PodStatusLatency = prometheus.NewSummary(
		prometheus.SummaryOpts{
			Subsystem: KubeletSubsystem,
			Name:      PodStatusLatencyKey,
			Help:      "Latency in microseconds to generate status for a single pod.",
		},
	)
	ContainerManagerLatency = prometheus.NewSummaryVec(
		prometheus.SummaryOpts{
			Subsystem: KubeletSubsystem,
			Name:      ContainerManagerOperationsKey,
			Help:      "Latency in microseconds for container manager operations. Broken down by method.",
		},
		[]string{"operation_type"},
	)
	PodWorkerStartLatency = prometheus.NewSummary(
		prometheus.SummaryOpts{
			Subsystem: KubeletSubsystem,
			Name:      PodWorkerStartLatencyKey,
			Help:      "Latency in microseconds from seeing a pod to starting a worker.",
		},
	)
	DockerOperationsLatency = prometheus.NewSummaryVec(
		prometheus.SummaryOpts{
			Subsystem: KubeletSubsystem,
			Name:      DockerOperationsKey,
			Help:      "Latency in microseconds of Docker operations. Broken down by operation type.",
		},
		[]string{"operation_type"},
	)
	DockerErrors = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Subsystem: KubeletSubsystem,
			Name:      DockerErrorsKey,
			Help:      "Cumulative number of Docker errors by operation type.",
		},
		[]string{"operation_type"},
	)
)