metrics

var (
	BackendStatusGauge = prometheus.NewGaugeVec(
		prometheus.GaugeOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelBackend,
			Name:      "b_status",
			Help:      "Gauge of backend status.",
		}, []string{LblBackend, LblStatus})

	GetBackendHistogram = prometheus.NewHistogram(
		prometheus.HistogramOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelBackend,
			Name:      "get_backend_duration_seconds",
			Help:      "Bucketed histogram of time (s) for getting an available backend.",
			Buckets:   prometheus.ExponentialBuckets(0.000001, 2, 26),
		})

	GetBackendCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelBackend,
			Name:      "get_backend",
			Help:      "Counter of getting backend.",
		}, []string{LblRes})

	PingBackendGauge = prometheus.NewGaugeVec(
		prometheus.GaugeOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelBackend,
			Name:      "ping_duration_seconds",
			Help:      "Time (s) of pinging the SQL port of each backend.",
		}, []string{LblBackend})

	HealthCheckCycleGauge = prometheus.NewGauge(
		prometheus.GaugeOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelBackend,
			Name:      "health_check_seconds",
			Help:      "Time (s) of each health check cycle.",
		})
)

var (
	BackendConnGauge = prometheus.NewGaugeVec(
		prometheus.GaugeOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelBalance,
			Name:      "b_conn",
			Help:      "Number of backend connections.",
		}, []string{LblBackend})

	MigrateCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelBalance,
			Name:      "migrate_total",
			Help:      "Number and result of session migration.",
		}, []string{LblFrom, LblTo, LblMigrateResult})

	MigrateDurationHistogram = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelBalance,
			Name:      "migrate_duration_seconds",
			Help:      "Bucketed histogram of migrating time (s) of sessions.",
			Buckets:   prometheus.ExponentialBuckets(0.0001, 2, 26),
		}, []string{LblFrom, LblTo, LblMigrateResult})
)

var (
	ConnGauge = prometheus.NewGauge(
		prometheus.GaugeOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelServer,
			Name:      "connections",
			Help:      "Number of connections.",
		})

	CreateConnCounter = prometheus.NewCounter(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelServer,
			Name:      "create_connection_total",
			Help:      "Number of create connections.",
		})

	DisConnCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelServer,
			Name:      "disconnection_total",
			Help:      "Number of disconnections.",
		}, []string{LblType})

	MaxProcsGauge = prometheus.NewGauge(
		prometheus.GaugeOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelServer,
			Name:      "maxprocs",
			Help:      "The value of GOMAXPROCS.",
		})

	ServerEventCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelServer,
			Name:      "event",
			Help:      "Counter of TiProxy event.",
		}, []string{LblType})

	ServerErrCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelServer,
			Name:      "err",
			Help:      "Counter of server error.",
		}, []string{LblType})

	TimeJumpBackCounter = prometheus.NewCounter(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelMonitor,
			Name:      "time_jump_back_total",
			Help:      "Counter of system time jumps backward.",
		})

	KeepAliveCounter = prometheus.NewCounter(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelMonitor,
			Name:      "keep_alive_total",
			Help:      "Counter of proxy keep alive.",
		})
)

var (
	QueryTotalCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelSession,
			Name:      "query_total",
			Help:      "Counter of queries.",
		}, []string{LblBackend, LblCmdType})

	QueryDurationHistogram = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelSession,
			Name:      "query_duration_seconds",
			Help:      "Bucketed histogram of processing time (s) of handled queries.",
			Buckets:   prometheus.ExponentialBuckets(0.0005, 2, 29),
		}, []string{LblBackend, LblCmdType})

	HandshakeDurationHistogram = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelSession,
			Name:      "handshake_duration_seconds",
			Help:      "Bucketed histogram of processing time (s) of handshakes.",
			Buckets:   prometheus.ExponentialBuckets(0.0005, 2, 29),
		}, []string{LblBackend})
)

var (
	InboundBytesCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelTraffic,
			Name:      "inbound_bytes",
			Help:      "Counter of bytes from backends.",
		}, []string{LblBackend})

	InboundPacketsCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelTraffic,
			Name:      "inbound_packets",
			Help:      "Counter of packets from backends.",
		}, []string{LblBackend})

	OutboundBytesCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelTraffic,
			Name:      "outbound_bytes",
			Help:      "Counter of bytes to backends.",
		}, []string{LblBackend})

	OutboundPacketsCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: ModuleProxy,
			Subsystem: LabelTraffic,
			Name:      "outbound_packets",
			Help:      "Counter of packets to backends.",
		}, []string{LblBackend})
)