metrics

var (
	BackendEventCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleWeirProxy,
			Subsystem: LabelBackend,
			Name:      "backend_event_total",
			Help:      "Counter of backend event.",
		}, []string{LblCluster, LblNamespace, LblType})

	BackendQueryCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleWeirProxy,
			Subsystem: LabelBackend,
			Name:      "b_conn_cnt",
			Help:      "Counter of backend query count.",
		}, []string{LblCluster, LblNamespace, LblBackendAddr})

	BackendConnInUseGauge = prometheus.NewGaugeVec(
		prometheus.GaugeOpts{
			Namespace: ModuleWeirProxy,
			Subsystem: LabelBackend,
			Name:      "b_conn_in_use",
			Help:      "Number of backend conn in use.",
		}, []string{LblCluster, LblNamespace, LblBackendAddr})
)

var (
	QueryCtxQueryCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleWeirProxy,
			Subsystem: LabelQueryCtx,
			Name:      "query_total",
			Help:      "Counter of queries.",
		}, []string{LblCluster, LblNamespace, LblDb, LblTable, LblSQLType, LblResult})

	QueryCtxQueryDeniedCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleWeirProxy,
			Subsystem: LabelQueryCtx,
			Name:      "query_denied",
			Help:      "Counter of denied queries.",
		}, []string{LblCluster, LblNamespace, LblDb, LblTable, LblSQLType})

	QueryCtxQueryDurationHistogram = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Namespace: ModuleWeirProxy,
			Subsystem: LabelQueryCtx,
			Name:      "handle_query_duration_seconds",
			Help:      "Bucketed histogram of processing time (s) of handled queries.",
			Buckets:   prometheus.ExponentialBuckets(0.0005, 2, 29),
		}, []string{LblCluster, LblNamespace, LblDb, LblTable, LblSQLType})

	QueryCtxGauge = prometheus.NewGaugeVec(
		prometheus.GaugeOpts{
			Namespace: ModuleWeirProxy,
			Subsystem: LabelQueryCtx,
			Name:      "queryctx",
			Help:      "Number of queryctx (equals to client connection).",
		}, []string{LblCluster, LblNamespace})

	QueryCtxAttachedConnGauge = prometheus.NewGaugeVec(
		prometheus.GaugeOpts{
			Namespace: ModuleWeirProxy,
			Subsystem: LabelQueryCtx,
			Name:      "attached_connections",
			Help:      "Number of attached backend connections.",
		}, []string{LblCluster, LblNamespace})

	QueryCtxTransactionDuration = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Namespace: "tidb",
			Subsystem: "session",
			Name:      "transaction_duration_seconds",
			Help:      "Bucketed histogram of a transaction execution duration, including retry.",
			Buckets:   prometheus.ExponentialBuckets(0.001, 2, 28),
		}, []string{LblCluster, LblNamespace, LblDb, LblSQLType})
)

var (
	// PanicCounter measures the count of panics.
	PanicCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleWeirProxy,
			Subsystem: LabelServer,
			Name:      "panic_total",
			Help:      "Counter of panic.",
		}, []string{LblCluster, LblType})

	QueryTotalCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleWeirProxy,
			Subsystem: LabelServer,
			Name:      "query_total",
			Help:      "Counter of queries.",
		}, []string{LblCluster, LblType, LblResult})

	ExecuteErrorCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleWeirProxy,
			Subsystem: LabelServer,
			Name:      "execute_error_total",
			Help:      "Counter of execute errors.",
		}, []string{LblCluster, LblType})

	ConnGauge = prometheus.NewGaugeVec(
		prometheus.GaugeOpts{
			Namespace: ModuleWeirProxy,
			Subsystem: LabelServer,
			Name:      "connections",
			Help:      "Number of connections.",
		}, []string{LblCluster})

	EventStart        = "start"
	EventGracefulDown = "graceful_shutdown"
	// Eventkill occurs when the server.Kill() function is called.
	EventKill  = "kill"
	EventClose = "close"
)