metrics

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

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

			"code",

			"role_arn",
		},
	)

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

			"role_arn",
		},
	)

	// K8sAPIDupReqCount tracks total number of K8s Api requests performed when duplicated pods are identified in the cache.
	K8sAPIDupReqCount = prometheus.NewCounter(
		prometheus.CounterOpts{
			Namespace: namespace,
			Subsystem: "iam",
			Name:      "k8s_dup_req_count",
			Help:      "Total number of K8s API requests performed when duplicated pods are identified in the cache.",
		},
	)

	// K8sAPIDupReqSuccesCount tracks total number of times we successfully retrieve the pod from the K8s Api.
	K8sAPIDupReqSuccesCount = prometheus.NewCounter(
		prometheus.CounterOpts{
			Namespace: namespace,
			Subsystem: "iam",
			Name:      "k8s_dup_req_success_count",
			Help:      "Total number of times we successfully retrieve the pod from the K8s API.",
		},
	)

	// PodNotFoundInCache tracks total number of times we don't have the pod info in the cache.
	PodNotFoundInCache = prometheus.NewCounter(
		prometheus.CounterOpts{
			Namespace: namespace,
			Subsystem: "iam",
			Name:      "k8s_pod_not_in_pod_cache",
			Help:      "Total number of times we don't have the pod info in the cache.",
		},
	)

	// HTTPRequestSec tracks timing of served HTTP requests.
	HTTPRequestSec = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Namespace: namespace,
			Subsystem: "http",
			Name:      "request_duration_seconds",
			Help:      "Time taken for kube2iam to serve HTTP request.",

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

			"code",

			"method",

			"handler",
		},
	)

	// HealthcheckStatus reports the current healthcheck status of kube2iam.
	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 kube2iam binary.
	Info = prometheus.NewGaugeVec(
		prometheus.GaugeOpts{
			Namespace: namespace,
			Name:      "info",
			Help:      "Informational labels about the kube2iam process.",
		},
		[]string{

			"version",

			"build_date",

			"commit_hash",
		},
	)
)