metrics

var (
	// RAMRequestSec tracks timing of RAM requests.
	RAMRequestSec = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Namespace: namespace,
			Subsystem: "ram",
			Name:      "request_duration_seconds",
			Help:      "Time taken to complete RAM request in seconds.",

			Buckets: prometheus.ExponentialBuckets(0.001, 2, 14),
		},
		[]string{

			"code",

			"role_arn",
		},
	)

	// RAMCacheHitCount tracks total number of RAM cache hits. Cache misses can be
	// calculated by looking at the total number of RAM requests for the same role_arn.
	RAMCacheHitCount = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: namespace,
			Subsystem: "ram",
			Name:      "cache_hits_total",
			Help:      "Total number of RAM cache hits.",
		},
		[]string{

			"role_arn",
		},
	)

	// HTTPRequestSec tracks timing of served HTTP requests.
	HTTPRequestSec = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Namespace: namespace,
			Subsystem: "http",
			Name:      "request_duration_seconds",
			Help:      "Time taken for kube2ram to serve HTTP request.",

			Buckets: prometheus.ExponentialBuckets(0.001, 2, 14),
		},
		[]string{

			"code",

			"method",

			"handler",
		},
	)

	// HealthcheckStatus reports the current healthcheck status of kube2ram.
	HealthcheckStatus = prometheus.NewGauge(
		prometheus.GaugeOpts{
			Namespace: namespace,
			Subsystem: "healthcheck",
			Name:      "status",
			Help:      "The healthcheck status at scrape time. A value of 1 means it is passing, 0 means it is failing.",
		},
	)

	// Info reports various static information about the running kube2ram binary.
	Info = prometheus.NewGaugeVec(
		prometheus.GaugeOpts{
			Namespace: namespace,
			Name:      "info",
			Help:      "Informational labels about the kube2ram process.",
		},
		[]string{

			"version",

			"build_date",

			"commit_hash",
		},
	)
)