Alerting/metrics (#33547)

* moves alerting metrics to their own pkg

* adds grafana_alerting_alerts (by state) metric

* alerts_received_{total,invalid}

* embed alertmanager alerting struct in ng metrics & remove duplicated notification metrics (already embed alertmanager notifier metrics)

* use silence metrics from alertmanager lib

* fix - manager has metrics

* updates ngalert tests

* comment lint
Signed-off-by: Owen Diehl <ow.diehl@gmail.com>

* cleaner prom registry code

* removes ngalert global metrics

* new registry use in all tests

* ngalert metrics impl service, hack testinfra code to prevent duplicate metric registrations

* nilmetrics unexported

pkg/services/ngalert/api/api.go

@@ -3,8 +3,8 @@ package api
 import (
 	"time"
 
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	"github.com/grafana/grafana/pkg/services/ngalert/state"
-	"github.com/prometheus/client_golang/prometheus"
 
 	"github.com/go-macaron/binding"
 
@@ -24,11 +24,6 @@ import (
 // timeNow makes it possible to test usage of time
 var timeNow = time.Now
 
-// metrics are a globally registered metric suite for alerting.
-// TODO: refactor testware to allow these to be created without
-// panicking on duplicate registration, thus enabling non-global vars.
-var metrics = NewMetrics(prometheus.DefaultRegisterer)
-
 type Alertmanager interface {
 	// Configuration
 	SaveAndApplyConfig(config *apimodels.PostableUserConfig) error
@@ -60,7 +55,7 @@ type API struct {
 }
 
 // RegisterAPIEndpoints registers API handlers
-func (api *API) RegisterAPIEndpoints() {
+func (api *API) RegisterAPIEndpoints(m *metrics.Metrics) {
 	logger := log.New("ngalert.api")
 	proxy := &AlertingProxy{
 		DataProxy: api.DataProxy,
@@ -71,26 +66,26 @@ func (api *API) RegisterAPIEndpoints() {
 		api.DatasourceCache,
 		NewLotexAM(proxy, logger),
 		AlertmanagerSrv{store: api.AlertingStore, am: api.Alertmanager, log: logger},
-	), metrics)
+	), m)
 	// Register endpoints for proxing to Prometheus-compatible backends.
 	api.RegisterPrometheusApiEndpoints(NewForkedProm(
 		api.DatasourceCache,
 		NewLotexProm(proxy, logger),
 		PrometheusSrv{log: logger, manager: api.StateManager, store: api.RuleStore},
-	), metrics)
+	), m)
 	// Register endpoints for proxing to Cortex Ruler-compatible backends.
 	api.RegisterRulerApiEndpoints(NewForkedRuler(
 		api.DatasourceCache,
 		NewLotexRuler(proxy, logger),
 		RulerSrv{DatasourceCache: api.DatasourceCache, store: api.RuleStore, log: logger},
-	), metrics)
+	), m)
 	api.RegisterTestingApiEndpoints(TestingApiSrv{
 		AlertingProxy:   proxy,
 		Cfg:             api.Cfg,
 		DataService:     api.DataService,
 		DatasourceCache: api.DatasourceCache,
 		log:             logger,
-	}, metrics)
+	}, m)
 
 	// Legacy routes; they will be removed in v8
 	api.RouteRegister.Group("/api/alert-definitions", func(alertDefinitions routing.RouteRegister) {

pkg/services/ngalert/api/generated_base_api_alertmanager.go

@@ -17,6 +17,7 @@ import (
 	"github.com/grafana/grafana/pkg/middleware"
 	"github.com/grafana/grafana/pkg/models"
 	apimodels "github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions"
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 )
 
 type AlertmanagerApiService interface {
@@ -32,99 +33,99 @@ type AlertmanagerApiService interface {
 	RoutePostAlertingConfig(*models.ReqContext, apimodels.PostableUserConfig) response.Response
 }
 
-func (api *API) RegisterAlertmanagerApiEndpoints(srv AlertmanagerApiService, metrics *Metrics) {
+func (api *API) RegisterAlertmanagerApiEndpoints(srv AlertmanagerApiService, m *metrics.Metrics) {
 	api.RouteRegister.Group("", func(group routing.RouteRegister) {
 		group.Post(
 			toMacaronPath("/api/alertmanager/{Recipient}/api/v2/silences"),
 			binding.Bind(apimodels.PostableSilence{}),
-			Instrument(
+			metrics.Instrument(
 				http.MethodPost,
 				"/api/alertmanager/{Recipient}/api/v2/silences",
 				srv.RouteCreateSilence,
-				metrics,
+				m,
 			),
 		)
 		group.Delete(
 			toMacaronPath("/api/alertmanager/{Recipient}/config/api/v1/alerts"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodDelete,
 				"/api/alertmanager/{Recipient}/config/api/v1/alerts",
 				srv.RouteDeleteAlertingConfig,
-				metrics,
+				m,
 			),
 		)
 		group.Delete(
 			toMacaronPath("/api/alertmanager/{Recipient}/api/v2/silence/{SilenceId}"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodDelete,
 				"/api/alertmanager/{Recipient}/api/v2/silence/{SilenceId}",
 				srv.RouteDeleteSilence,
-				metrics,
+				m,
 			),
 		)
 		group.Get(
 			toMacaronPath("/api/alertmanager/{Recipient}/api/v2/alerts/groups"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodGet,
 				"/api/alertmanager/{Recipient}/api/v2/alerts/groups",
 				srv.RouteGetAMAlertGroups,
-				metrics,
+				m,
 			),
 		)
 		group.Get(
 			toMacaronPath("/api/alertmanager/{Recipient}/api/v2/alerts"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodGet,
 				"/api/alertmanager/{Recipient}/api/v2/alerts",
 				srv.RouteGetAMAlerts,
-				metrics,
+				m,
 			),
 		)
 		group.Get(
 			toMacaronPath("/api/alertmanager/{Recipient}/config/api/v1/alerts"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodGet,
 				"/api/alertmanager/{Recipient}/config/api/v1/alerts",
 				srv.RouteGetAlertingConfig,
-				metrics,
+				m,
 			),
 		)
 		group.Get(
 			toMacaronPath("/api/alertmanager/{Recipient}/api/v2/silence/{SilenceId}"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodGet,
 				"/api/alertmanager/{Recipient}/api/v2/silence/{SilenceId}",
 				srv.RouteGetSilence,
-				metrics,
+				m,
 			),
 		)
 		group.Get(
 			toMacaronPath("/api/alertmanager/{Recipient}/api/v2/silences"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodGet,
 				"/api/alertmanager/{Recipient}/api/v2/silences",
 				srv.RouteGetSilences,
-				metrics,
+				m,
 			),
 		)
 		group.Post(
 			toMacaronPath("/api/alertmanager/{Recipient}/api/v2/alerts"),
 			binding.Bind(apimodels.PostableAlerts{}),
-			Instrument(
+			metrics.Instrument(
 				http.MethodPost,
 				"/api/alertmanager/{Recipient}/api/v2/alerts",
 				srv.RoutePostAMAlerts,
-				metrics,
+				m,
 			),
 		)
 		group.Post(
 			toMacaronPath("/api/alertmanager/{Recipient}/config/api/v1/alerts"),
 			binding.Bind(apimodels.PostableUserConfig{}),
-			Instrument(
+			metrics.Instrument(
 				http.MethodPost,
 				"/api/alertmanager/{Recipient}/config/api/v1/alerts",
 				srv.RoutePostAlertingConfig,
-				metrics,
+				m,
 			),
 		)
 	}, middleware.ReqSignedIn)

pkg/services/ngalert/api/generated_base_api_prometheus.go

@@ -14,6 +14,7 @@ import (
 	"github.com/grafana/grafana/pkg/api/routing"
 	"github.com/grafana/grafana/pkg/middleware"
 	"github.com/grafana/grafana/pkg/models"
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 )
 
 type PrometheusApiService interface {
@@ -21,24 +22,24 @@ type PrometheusApiService interface {
 	RouteGetRuleStatuses(*models.ReqContext) response.Response
 }
 
-func (api *API) RegisterPrometheusApiEndpoints(srv PrometheusApiService, metrics *Metrics) {
+func (api *API) RegisterPrometheusApiEndpoints(srv PrometheusApiService, m *metrics.Metrics) {
 	api.RouteRegister.Group("", func(group routing.RouteRegister) {
 		group.Get(
 			toMacaronPath("/api/prometheus/{Recipient}/api/v1/alerts"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodGet,
 				"/api/prometheus/{Recipient}/api/v1/alerts",
 				srv.RouteGetAlertStatuses,
-				metrics,
+				m,
 			),
 		)
 		group.Get(
 			toMacaronPath("/api/prometheus/{Recipient}/api/v1/rules"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodGet,
 				"/api/prometheus/{Recipient}/api/v1/rules",
 				srv.RouteGetRuleStatuses,
-				metrics,
+				m,
 			),
 		)
 	}, middleware.ReqSignedIn)

pkg/services/ngalert/api/generated_base_api_ruler.go

@@ -17,6 +17,7 @@ import (
 	"github.com/grafana/grafana/pkg/middleware"
 	"github.com/grafana/grafana/pkg/models"
 	apimodels "github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions"
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 )
 
 type RulerApiService interface {
@@ -28,61 +29,61 @@ type RulerApiService interface {
 	RoutePostNameRulesConfig(*models.ReqContext, apimodels.PostableRuleGroupConfig) response.Response
 }
 
-func (api *API) RegisterRulerApiEndpoints(srv RulerApiService, metrics *Metrics) {
+func (api *API) RegisterRulerApiEndpoints(srv RulerApiService, m *metrics.Metrics) {
 	api.RouteRegister.Group("", func(group routing.RouteRegister) {
 		group.Delete(
 			toMacaronPath("/api/ruler/{Recipient}/api/v1/rules/{Namespace}"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodDelete,
 				"/api/ruler/{Recipient}/api/v1/rules/{Namespace}",
 				srv.RouteDeleteNamespaceRulesConfig,
-				metrics,
+				m,
 			),
 		)
 		group.Delete(
 			toMacaronPath("/api/ruler/{Recipient}/api/v1/rules/{Namespace}/{Groupname}"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodDelete,
 				"/api/ruler/{Recipient}/api/v1/rules/{Namespace}/{Groupname}",
 				srv.RouteDeleteRuleGroupConfig,
-				metrics,
+				m,
 			),
 		)
 		group.Get(
 			toMacaronPath("/api/ruler/{Recipient}/api/v1/rules/{Namespace}"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodGet,
 				"/api/ruler/{Recipient}/api/v1/rules/{Namespace}",
 				srv.RouteGetNamespaceRulesConfig,
-				metrics,
+				m,
 			),
 		)
 		group.Get(
 			toMacaronPath("/api/ruler/{Recipient}/api/v1/rules/{Namespace}/{Groupname}"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodGet,
 				"/api/ruler/{Recipient}/api/v1/rules/{Namespace}/{Groupname}",
 				srv.RouteGetRulegGroupConfig,
-				metrics,
+				m,
 			),
 		)
 		group.Get(
 			toMacaronPath("/api/ruler/{Recipient}/api/v1/rules"),
-			Instrument(
+			metrics.Instrument(
 				http.MethodGet,
 				"/api/ruler/{Recipient}/api/v1/rules",
 				srv.RouteGetRulesConfig,
-				metrics,
+				m,
 			),
 		)
 		group.Post(
 			toMacaronPath("/api/ruler/{Recipient}/api/v1/rules/{Namespace}"),
 			binding.Bind(apimodels.PostableRuleGroupConfig{}),
-			Instrument(
+			metrics.Instrument(
 				http.MethodPost,
 				"/api/ruler/{Recipient}/api/v1/rules/{Namespace}",
 				srv.RoutePostNameRulesConfig,
-				metrics,
+				m,
 			),
 		)
 	}, middleware.ReqSignedIn)

pkg/services/ngalert/api/generated_base_api_testing.go

@@ -17,6 +17,7 @@ import (
 	"github.com/grafana/grafana/pkg/middleware"
 	"github.com/grafana/grafana/pkg/models"
 	apimodels "github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions"
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 )
 
 type TestingApiService interface {
@@ -25,36 +26,36 @@ type TestingApiService interface {
 	RouteTestRuleConfig(*models.ReqContext, apimodels.TestRulePayload) response.Response
 }
 
-func (api *API) RegisterTestingApiEndpoints(srv TestingApiService, metrics *Metrics) {
+func (api *API) RegisterTestingApiEndpoints(srv TestingApiService, m *metrics.Metrics) {
 	api.RouteRegister.Group("", func(group routing.RouteRegister) {
 		group.Post(
 			toMacaronPath("/api/v1/eval"),
 			binding.Bind(apimodels.EvalQueriesPayload{}),
-			Instrument(
+			metrics.Instrument(
 				http.MethodPost,
 				"/api/v1/eval",
 				srv.RouteEvalQueries,
-				metrics,
+				m,
 			),
 		)
 		group.Post(
 			toMacaronPath("/api/v1/receiver/test/{Recipient}"),
 			binding.Bind(apimodels.ExtendedReceiver{}),
-			Instrument(
+			metrics.Instrument(
 				http.MethodPost,
 				"/api/v1/receiver/test/{Recipient}",
 				srv.RouteTestReceiverConfig,
-				metrics,
+				m,
 			),
 		)
 		group.Post(
 			toMacaronPath("/api/v1/rule/test/{Recipient}"),
 			binding.Bind(apimodels.TestRulePayload{}),
-			Instrument(
+			metrics.Instrument(
 				http.MethodPost,
 				"/api/v1/rule/test/{Recipient}",
 				srv.RouteTestRuleConfig,
-				metrics,
+				m,
 			),
 		)
 	}, middleware.ReqSignedIn)

pkg/services/ngalert/api/tooling/swagger-codegen/templates/controller-api.mustache

@@ -9,6 +9,7 @@ import (
 	"github.com/grafana/grafana/pkg/api/response"
 	"github.com/grafana/grafana/pkg/models"
 	apimodels "github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions"
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	"github.com/grafana/grafana/pkg/middleware"
 )
 
@@ -16,16 +17,16 @@ type {{classname}}Service interface { {{#operation}}
 	{{nickname}}(*models.ReqContext{{#bodyParams}}, apimodels.{{dataType}}{{/bodyParams}}) response.Response{{/operation}}
 }
 
-func (api *API) Register{{classname}}Endpoints(srv {{classname}}Service, metrics *Metrics) {
+func (api *API) Register{{classname}}Endpoints(srv {{classname}}Service, m *metrics.Metrics) {
 	api.RouteRegister.Group("", func(group routing.RouteRegister){ {{#operations}}{{#operation}}
 	group.{{httpMethod}}(
 		toMacaronPath("{{{path}}}"){{#bodyParams}},
 		binding.Bind(apimodels.{{dataType}}{}){{/bodyParams}},
-		Instrument(
+		metrics.Instrument(
 			http.Method{{httpMethod}},
 			"{{{path}}}",
 			srv.{{nickname}},
-			metrics,
+			m,
 		),
   ){{/operation}}{{/operations}}
 	}, middleware.ReqSignedIn)

pkg/services/ngalert/metrics/metrics.go

@@ -1,4 +1,4 @@
-package api
+package metrics
 
 import (
 	"fmt"
@@ -6,9 +6,12 @@ import (
 	"strings"
 	"time"
 
+	"github.com/prometheus/alertmanager/api/metrics"
+
 	"github.com/grafana/grafana/pkg/api/response"
 	"github.com/grafana/grafana/pkg/api/routing"
 	"github.com/grafana/grafana/pkg/models"
+	"github.com/grafana/grafana/pkg/registry"
 	apimodels "github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
@@ -20,57 +23,42 @@ const (
 	ProxyBackend   = "proxy"
 )
 
+var GlobalMetrics = NewMetrics(prometheus.DefaultRegisterer)
+
 type Metrics struct {
-	alerts              *prometheus.GaugeVec
-	alertsInvalid       prometheus.Counter
-	alertsReceived      prometheus.Counter
-	notificationLatency prometheus.Histogram
-	notifications       *prometheus.CounterVec
-	notificationsFailed *prometheus.CounterVec
-	requestDuration     *prometheus.HistogramVec
-	silences            *prometheus.GaugeVec
+	*metrics.Alerts
+	AlertState *prometheus.GaugeVec
+	// Registerer is for use by subcomponents which register their own metrics.
+	Registerer      prometheus.Registerer
+	RequestDuration *prometheus.HistogramVec
+}
+
+func init() {
+	registry.RegisterService(GlobalMetrics)
+}
+
+func (m *Metrics) Init() error {
+	return nil
+}
+
+// SwapRegisterer overwrites the prometheus register used by a *Metrics in place.
+// It's used by tests to prevent duplicate registration errors
+func (m *Metrics) SwapRegisterer(r prometheus.Registerer) {
+	next := NewMetrics(r)
+	*m = *next
 }
 
 func NewMetrics(r prometheus.Registerer) *Metrics {
 	return &Metrics{
-		alerts: promauto.With(r).NewGaugeVec(prometheus.GaugeOpts{
+		Alerts: metrics.NewAlerts("v2", r),
+		AlertState: promauto.With(r).NewGaugeVec(prometheus.GaugeOpts{
 			Namespace: "grafana",
 			Subsystem: "alerting",
 			Name:      "alerts",
 			Help:      "How many alerts by state.",
 		}, []string{"state"}),
-		alertsInvalid: promauto.With(r).NewCounter(prometheus.CounterOpts{
-			Namespace: "grafana",
-			Subsystem: "alerting",
-			Name:      "alerts_invalid_total",
-			Help:      "The total number of invalid received alerts.",
-		}),
-		alertsReceived: promauto.With(r).NewCounter(prometheus.CounterOpts{
-			Namespace: "grafana",
-			Subsystem: "alerting",
-			Name:      "alerts_received_total",
-			Help:      "The total number of received alerts.",
-		}),
-		notificationLatency: promauto.With(r).NewHistogram(prometheus.HistogramOpts{
-			Namespace: "grafana",
-			Subsystem: "alerting",
-			Name:      "notification_latency_seconds",
-			Help:      "Histogram of notification deliveries",
-			Buckets:   prometheus.DefBuckets,
-		}),
-		notifications: promauto.With(r).NewCounterVec(prometheus.CounterOpts{
-			Namespace: "grafana",
-			Subsystem: "alerting",
-			Name:      "notifications_total",
-			Help:      "The total number of attempted notfications by integration.",
-		}, []string{"integration"}),
-		notificationsFailed: promauto.With(r).NewCounterVec(prometheus.CounterOpts{
-			Namespace: "grafana",
-			Subsystem: "alerting",
-			Name:      "notifications_failed_total",
-			Help:      "The total number of failed notfications by integration.",
-		}, []string{"integration"}),
-		requestDuration: promauto.With(r).NewHistogramVec(
+		Registerer: r,
+		RequestDuration: promauto.With(r).NewHistogramVec(
 			prometheus.HistogramOpts{
 				Namespace: "grafana",
 				Subsystem: "alerting",
@@ -80,12 +68,6 @@ func NewMetrics(r prometheus.Registerer) *Metrics {
 			},
 			[]string{"method", "route", "status_code", "backend"},
 		),
-		silences: promauto.With(r).NewGaugeVec(prometheus.GaugeOpts{
-			Namespace: "grafana",
-			Subsystem: "alerting",
-			Name:      "silences",
-			Help:      "The total number of silences by state.",
-		}, []string{"state"}),
 	}
 }
 
@@ -124,7 +106,7 @@ func Instrument(
 			"backend":     backend,
 		}
 		res.WriteTo(c)
-		metrics.requestDuration.With(ls).Observe(time.Since(start).Seconds())
+		metrics.RequestDuration.With(ls).Observe(time.Since(start).Seconds())
 	}
 }
 

pkg/services/ngalert/ngalert.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"time"
 
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	"github.com/grafana/grafana/pkg/services/ngalert/state"
 
 	"github.com/benbjohnson/clock"
@@ -45,6 +46,7 @@ type AlertNG struct {
 	DataService     *tsdb.Service                           `inject:""`
 	Alertmanager    *notifier.Alertmanager                  `inject:""`
 	DataProxy       *datasourceproxy.DatasourceProxyService `inject:""`
+	Metrics         *metrics.Metrics                        `inject:""`
 	Log             log.Logger
 	schedule        schedule.ScheduleService
 	stateManager    *state.Manager
@@ -57,7 +59,7 @@ func init() {
 // Init initializes the AlertingService.
 func (ng *AlertNG) Init() error {
 	ng.Log = log.New("ngalert")
-	ng.stateManager = state.NewManager(ng.Log)
+	ng.stateManager = state.NewManager(ng.Log, ng.Metrics)
 	baseInterval := baseIntervalSeconds * time.Second
 
 	store := store.DBstore{BaseInterval: baseInterval, DefaultIntervalSeconds: defaultIntervalSeconds, SQLStore: ng.SQLStore}
@@ -87,7 +89,7 @@ func (ng *AlertNG) Init() error {
 		Alertmanager:    ng.Alertmanager,
 		StateManager:    ng.stateManager,
 	}
-	api.RegisterAPIEndpoints()
+	api.RegisterAPIEndpoints(ng.Metrics)
 
 	return nil
 }

pkg/services/ngalert/notifier/alertmanager.go

@@ -22,7 +22,6 @@ import (
 	"github.com/prometheus/alertmanager/silence"
 	"github.com/prometheus/alertmanager/template"
 	"github.com/prometheus/alertmanager/types"
-	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 
 	"github.com/grafana/grafana/pkg/components/securejsondata"
@@ -31,6 +30,7 @@ import (
 	"github.com/grafana/grafana/pkg/registry"
 	"github.com/grafana/grafana/pkg/services/alerting"
 	apimodels "github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions"
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	ngmodels "github.com/grafana/grafana/pkg/services/ngalert/models"
 	"github.com/grafana/grafana/pkg/services/ngalert/notifier/channels"
 	"github.com/grafana/grafana/pkg/services/ngalert/store"
@@ -81,6 +81,7 @@ type Alertmanager struct {
 	Settings *setting.Cfg       `inject:""`
 	SQLStore *sqlstore.SQLStore `inject:""`
 	Store    store.AlertingStore
+	Metrics  *metrics.Metrics `inject:""`
 
 	notificationLog *nflog.Log
 	marker          types.Marker
@@ -116,13 +117,19 @@ func (am *Alertmanager) IsDisabled() bool {
 	return !am.Settings.IsNgAlertEnabled()
 }
 
-func (am *Alertmanager) Init() (err error) {
+func (am *Alertmanager) Init() error {
+	return am.InitWithMetrics(am.Metrics)
+}
+
+// InitWithMetrics uses the supplied metrics for instantiation and
+// allows testware to circumvent duplicate registration errors.
+func (am *Alertmanager) InitWithMetrics(m *metrics.Metrics) (err error) {
 	am.stopc = make(chan struct{})
 	am.logger = log.New("alertmanager")
-	r := prometheus.NewRegistry()
-	am.marker = types.NewMarker(r)
-	am.stageMetrics = notify.NewMetrics(r)
-	am.dispatcherMetrics = dispatch.NewDispatcherMetrics(r)
+	am.marker = types.NewMarker(m.Registerer)
+	am.stageMetrics = notify.NewMetrics(m.Registerer)
+	am.dispatcherMetrics = dispatch.NewDispatcherMetrics(m.Registerer)
+	am.Metrics = m
 	am.Store = store.DBstore{SQLStore: am.SQLStore}
 
 	// Initialize the notification log
@@ -137,6 +144,7 @@ func (am *Alertmanager) Init() (err error) {
 	}
 	// Initialize silences
 	am.silences, err = silence.New(silence.Options{
+		Metrics:      m.Registerer,
 		SnapshotFile: filepath.Join(am.WorkingDirPath(), "silences"),
 		Retention:    retentionNotificationsAndSilences,
 	})
@@ -456,12 +464,19 @@ func (am *Alertmanager) PutAlerts(postableAlerts apimodels.PostableAlerts) error
 			alert.EndsAt = now.Add(defaultResolveTimeout)
 		}
 
+		if alert.EndsAt.After(now) {
+			am.Metrics.Firing().Inc()
+		} else {
+			am.Metrics.Resolved().Inc()
+		}
+
 		if err := alert.Validate(); err != nil {
 			if validationErr == nil {
 				validationErr = &AlertValidationError{}
 			}
 			validationErr.Alerts = append(validationErr.Alerts, a)
 			validationErr.Errors = append(validationErr.Errors, err)
+			am.Metrics.Invalid().Inc()
 			continue
 		}
 

pkg/services/ngalert/notifier/alertmanager_test.go

@@ -19,6 +19,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	apimodels "github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions"
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	"github.com/grafana/grafana/pkg/services/sqlstore"
 	"github.com/grafana/grafana/pkg/setting"
 )
@@ -27,7 +28,7 @@ func TestAlertmanager_ShouldUseDefaultConfigurationWhenNoConfiguration(t *testin
 	am := &Alertmanager{}
 	am.Settings = &setting.Cfg{}
 	am.SQLStore = sqlstore.InitTestDB(t)
-	require.NoError(t, am.Init())
+	require.NoError(t, am.InitWithMetrics(metrics.NewMetrics(prometheus.NewRegistry())))
 	require.NoError(t, am.SyncAndApplyConfigFromDatabase())
 	require.NotNil(t, am.config)
 }
@@ -44,7 +45,7 @@ func TestPutAlert(t *testing.T) {
 		DataPath: dir,
 	}
 
-	require.NoError(t, am.Init())
+	require.NoError(t, am.InitWithMetrics(metrics.NewMetrics(prometheus.NewRegistry())))
 
 	startTime := time.Now()
 	endTime := startTime.Add(2 * time.Hour)

pkg/services/ngalert/state/cache.go

@@ -2,12 +2,14 @@ package state
 
 import (
 	"fmt"
+	"strings"
 	"sync"
 
 	"github.com/grafana/grafana-plugin-sdk-go/data"
 
 	"github.com/grafana/grafana/pkg/infra/log"
 	"github.com/grafana/grafana/pkg/services/ngalert/eval"
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	ngModels "github.com/grafana/grafana/pkg/services/ngalert/models"
 	prometheusModel "github.com/prometheus/common/model"
 )
@@ -16,12 +18,14 @@ type cache struct {
 	states    map[string]*State
 	mtxStates sync.RWMutex
 	log       log.Logger
+	metrics   *metrics.Metrics
 }
 
-func newCache(logger log.Logger) *cache {
+func newCache(logger log.Logger, metrics *metrics.Metrics) *cache {
 	return &cache{
-		states: make(map[string]*State),
-		log:    logger,
+		states:  make(map[string]*State),
+		log:     logger,
+		metrics: metrics,
 	}
 }
 
@@ -118,13 +122,23 @@ func (c *cache) reset() {
 func (c *cache) trim() {
 	c.mtxStates.Lock()
 	defer c.mtxStates.Unlock()
+
+	ct := make(map[eval.State]int)
+
 	for _, v := range c.states {
 		if len(v.Results) > 100 {
 			newResults := make([]Evaluation, 100)
-			copy(newResults, v.Results[100:])
+			// Keep last 100 results
+			copy(newResults, v.Results[len(v.Results)-100:])
 			v.Results = newResults
-			c.set(v)
 		}
+
+		n := ct[v.State]
+		ct[v.State] = n + 1
+	}
+
+	for k, n := range ct {
+		c.metrics.AlertState.WithLabelValues(strings.ToLower(k.String())).Set(float64(n))
 	}
 }
 

pkg/services/ngalert/state/manager.go

@@ -1,25 +1,29 @@
 package state
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/grafana/grafana/pkg/infra/log"
 
 	"github.com/grafana/grafana/pkg/services/ngalert/eval"
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	ngModels "github.com/grafana/grafana/pkg/services/ngalert/models"
 )
 
 type Manager struct {
-	cache *cache
-	quit  chan struct{}
-	Log   log.Logger
+	cache   *cache
+	quit    chan struct{}
+	Log     log.Logger
+	metrics *metrics.Metrics
 }
 
-func NewManager(logger log.Logger) *Manager {
+func NewManager(logger log.Logger, metrics *metrics.Metrics) *Manager {
 	manager := &Manager{
-		cache: newCache(logger),
-		quit:  make(chan struct{}),
-		Log:   logger,
+		cache:   newCache(logger, metrics),
+		quit:    make(chan struct{}),
+		Log:     logger,
+		metrics: metrics,
 	}
 	go manager.cleanUp()
 	return manager
@@ -95,8 +99,11 @@ func (st *Manager) GetStatesByRuleUID() map[string][]*State {
 }
 
 func (st *Manager) cleanUp() {
-	ticker := time.NewTicker(time.Duration(60) * time.Minute)
-	st.Log.Debug("starting cleanup process", "intervalMinutes", 60)
+	// TODO: parameterize?
+	// Setting to a reasonable default scrape interval for Prometheus.
+	dur := time.Duration(15) * time.Second
+	ticker := time.NewTicker(dur)
+	st.Log.Debug("starting cleanup process", "dur", fmt.Sprint(dur))
 	for {
 		select {
 		case <-ticker.C:

pkg/services/ngalert/tests/manager_test.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	"github.com/grafana/grafana/pkg/services/ngalert/state"
 
 	"github.com/grafana/grafana/pkg/infra/log"
@@ -16,6 +17,8 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+var nilMetrics = metrics.NewMetrics(nil)
+
 func TestProcessEvalResults(t *testing.T) {
 	evaluationTime, err := time.Parse("2006-01-02", "2021-03-25")
 	if err != nil {
@@ -775,7 +778,7 @@ func TestProcessEvalResults(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		st := state.NewManager(log.New("test_state_manager"))
+		st := state.NewManager(log.New("test_state_manager"), nilMetrics)
 		t.Run(tc.desc, func(t *testing.T) {
 			for _, res := range tc.evalResults {
 				_ = st.ProcessEvalResults(tc.alertRule, res)

pkg/services/ngalert/tests/schedule_test.go

@@ -94,7 +94,7 @@ func TestWarmStateCache(t *testing.T) {
 		Store:        dbstore,
 	}
 	sched := schedule.NewScheduler(schedCfg, nil)
-	st := state.NewManager(schedCfg.Logger)
+	st := state.NewManager(schedCfg.Logger, nilMetrics)
 	sched.WarmStateCache(st)
 
 	t.Run("instance cache has expected entries", func(t *testing.T) {
@@ -140,7 +140,7 @@ func TestAlertingTicker(t *testing.T) {
 
 	ctx := context.Background()
 
-	st := state.NewManager(schedCfg.Logger)
+	st := state.NewManager(schedCfg.Logger, nilMetrics)
 	go func() {
 		err := sched.Ticker(ctx, st)
 		require.NoError(t, err)

pkg/tests/testinfra/testinfra.go

@@ -16,7 +16,9 @@ import (
 	"github.com/grafana/grafana/pkg/models"
 	"github.com/grafana/grafana/pkg/registry"
 	"github.com/grafana/grafana/pkg/server"
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	"github.com/grafana/grafana/pkg/services/sqlstore"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"gopkg.in/ini.v1"
@@ -26,8 +28,10 @@ import (
 // The server address is returned.
 func StartGrafana(t *testing.T, grafDir, cfgPath string, sqlStore *sqlstore.SQLStore) string {
 	t.Helper()
-
 	ctx := context.Background()
+	// Prevent duplicate registration errors between tests by replacing
+	// the registry used.
+	metrics.GlobalMetrics.SwapRegisterer(prometheus.NewRegistry())
 
 	origSQLStore := registry.GetService(sqlstore.ServiceName)
 	t.Cleanup(func() {