var (
	// SyncProxyRulesLatency is the latency of one round of kube-proxy syncing proxy rules.
	SyncProxyRulesLatency = prometheus.NewHistogram(
		prometheus.HistogramOpts{
			Subsystem: kubeProxySubsystem,
			Name:      "sync_proxy_rules_duration_seconds",
			Help:      "SyncProxyRules latency in seconds",
			Buckets:   prometheus.ExponentialBuckets(0.001, 2, 15),
		},
	)

	// DeprecatedSyncProxyRulesLatency is the latency of one round of kube-proxy syncing proxy rules.
	DeprecatedSyncProxyRulesLatency = prometheus.NewHistogram(
		prometheus.HistogramOpts{
			Subsystem: kubeProxySubsystem,
			Name:      "sync_proxy_rules_latency_microseconds",
			Help:      "(Deprecated) SyncProxyRules latency in microseconds",
			Buckets:   prometheus.ExponentialBuckets(1000, 2, 15),
		},
	)

	// SyncProxyRulesLastTimestamp is the timestamp proxy rules were last
	// successfully synced.
	SyncProxyRulesLastTimestamp = prometheus.NewGauge(
		prometheus.GaugeOpts{
			Subsystem: kubeProxySubsystem,
			Name:      "sync_proxy_rules_last_timestamp_seconds",
			Help:      "The last time proxy rules were successfully synced",
		},
	)

	// NetworkProgrammingLatency is defined as the time it took to program the network - from the time
	// the service or pod has changed to the time the change was propagated and the proper kube-proxy
	// rules were synced. Exported for each endpoints object that were part of the rules sync.
	// See https://github.com/kubernetes/community/blob/master/sig-scalability/slos/network_programming_latency.md
	// Note that the metrics is partially based on the time exported by the endpoints controller on
	// the master machine. The measurement may be inaccurate if there is a clock drift between the
	// node and master machine.
	NetworkProgrammingLatency = prometheus.NewHistogram(
		prometheus.HistogramOpts{
			Subsystem: kubeProxySubsystem,
			Name:      "network_programming_duration_seconds",
			Help:      "In Cluster Network Programming Latency in seconds",

			Buckets: prometheus.ExponentialBuckets(0.001, 2, 20),
		},
	)

	// EndpointChangesPending is the number of pending endpoint changes that
	// have not yet been synced to the proxy.
	EndpointChangesPending = prometheus.NewGauge(
		prometheus.GaugeOpts{
			Subsystem: kubeProxySubsystem,
			Name:      "sync_proxy_rules_endpoint_changes_pending",
			Help:      "Pending proxy rules Endpoint changes",
		},
	)

	// EndpointChangesTotal is the number of endpoint changes that the proxy
	// has seen.
	EndpointChangesTotal = prometheus.NewCounter(
		prometheus.CounterOpts{
			Subsystem: kubeProxySubsystem,
			Name:      "sync_proxy_rules_endpoint_changes_total",
			Help:      "Cumulative proxy rules Endpoint changes",
		},
	)

	// ServiceChangesPending is the number of pending service changes that
	// have not yet been synced to the proxy.
	ServiceChangesPending = prometheus.NewGauge(
		prometheus.GaugeOpts{
			Subsystem: kubeProxySubsystem,
			Name:      "sync_proxy_rules_service_changes_pending",
			Help:      "Pending proxy rules Service changes",
		},
	)

	// ServiceChangesTotal is the number of service changes that the proxy has
	// seen.
	ServiceChangesTotal = prometheus.NewCounter(
		prometheus.CounterOpts{
			Subsystem: kubeProxySubsystem,
			Name:      "sync_proxy_rules_service_changes_total",
			Help:      "Cumulative proxy rules Service changes",
		},
	)
)