Alerting: Add metrics to the remote Alertmanager struct (#79835)

* Alerting: Add metrics to the remote Alertmanager struct

* rephrase http_requests_failed description

* make linter happy

* remove unnecessary metrics

* extract timed client to separate package

* use histogram collector from dskit

* remove weaveworks dependency

* capture metrics for all requests to the remote Alertmanager (both clients)

* use the timed client in the MimirAuthRoundTripper

* HTTPRequestsDuration -> HTTPRequestDuration, clean up mimir client factory function

* refactor

* less git diff

* gauge for last readiness check in seconds

* initialize LastReadinesCheck to 0, tweak metric names and descriptions

* add counters for sync attempts/errors

* last config sync and last state sync timestamps (gauges)

* change latency metric name

* metric for remote Alertmanager mode

* code review comments

* move label constants to metrics package

pkg/services/ngalert/client/client.go

@@ -1,4 +1,4 @@
-package historian
+package client
 
 import (
 	"context"
@@ -39,6 +39,11 @@ func (c TimedClient) Do(r *http.Request) (*http.Response, error) {
 	return TimeRequest(r.Context(), c.operationName(r), c.collector, c.client, r)
 }
 
+// RoundTrip implements the RoundTripper interface.
+func (c TimedClient) RoundTrip(r *http.Request) (*http.Response, error) {
+	return c.Do(r)
+}
+
 func (c TimedClient) operationName(r *http.Request) string {
 	operation, _ := r.Context().Value(OperationNameContextKey).(string)
 	if operation == "" {

pkg/services/ngalert/client/client_test.go

@@ -1,4 +1,4 @@
-package historian
+package client
 
 import (
 	"context"

pkg/services/ngalert/metrics/ngalert.go

@@ -30,6 +30,7 @@ type NGAlert struct {
 	multiOrgAlertmanagerMetrics *MultiOrgAlertmanager
 	apiMetrics                  *API
 	historianMetrics            *Historian
+	remoteAlertmanagerMetrics   *RemoteAlertmanager
 }
 
 // NewNGAlert manages the metrics of all the alerting components.
@@ -41,6 +42,7 @@ func NewNGAlert(r prometheus.Registerer) *NGAlert {
 		multiOrgAlertmanagerMetrics: NewMultiOrgAlertmanagerMetrics(r),
 		apiMetrics:                  NewAPIMetrics(r),
 		historianMetrics:            NewHistorianMetrics(r, Subsystem),
+		remoteAlertmanagerMetrics:   NewRemoteAlertmanagerMetrics(r),
 	}
 }
 
@@ -63,3 +65,7 @@ func (ng *NGAlert) GetMultiOrgAlertmanagerMetrics() *MultiOrgAlertmanager {
 func (ng *NGAlert) GetHistorianMetrics() *Historian {
 	return ng.historianMetrics
 }
+
+func (ng *NGAlert) GetRemoteAlertmanagerMetrics() *RemoteAlertmanager {
+	return ng.remoteAlertmanagerMetrics
+}

pkg/services/ngalert/metrics/remote_alertmanager.go

@@ -0,0 +1,84 @@
+package metrics
+
+import (
+	"github.com/grafana/dskit/instrument"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+const (
+	ModeRemoteSecondary = "remote_secondary"
+	ModeRemotePrimary   = "remote_primary"
+	ModeRemoteOnly      = "remote_only"
+)
+
+type RemoteAlertmanager struct {
+	Info                  *prometheus.GaugeVec
+	RequestLatency        *instrument.HistogramCollector
+	LastReadinessCheck    prometheus.Gauge
+	ConfigSyncsTotal      prometheus.Counter
+	ConfigSyncErrorsTotal prometheus.Counter
+	LastConfigSync        prometheus.Gauge
+	StateSyncsTotal       prometheus.Counter
+	StateSyncErrorsTotal  prometheus.Counter
+	LastStateSync         prometheus.Gauge
+}
+
+func NewRemoteAlertmanagerMetrics(r prometheus.Registerer) *RemoteAlertmanager {
+	return &RemoteAlertmanager{
+		Info: promauto.With(r).NewGaugeVec(prometheus.GaugeOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "remote_alertmanager_info",
+			Help:      "Information about the remote Alertmanager.",
+		}, []string{"mode"}),
+		RequestLatency: instrument.NewHistogramCollector(promauto.With(r).NewHistogramVec(prometheus.HistogramOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "remote_alertmanager_latency_seconds",
+			Help:      "Histogram of request latencies to the remote Alertmanager.",
+		}, instrument.HistogramCollectorBuckets)),
+		LastReadinessCheck: promauto.With(r).NewGauge(prometheus.GaugeOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "remote_alertmanager_last_readiness_check_timestamp_seconds",
+			Help:      "Timestamp of the last successful readiness check to the remote Alertmanager in seconds.",
+		}),
+		ConfigSyncsTotal: promauto.With(r).NewCounter(prometheus.CounterOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "remote_alertmanager_configuration_syncs_total",
+			Help:      "Total number of configuration syncs to the remote Alertmanager.",
+		}),
+		ConfigSyncErrorsTotal: promauto.With(r).NewCounter(prometheus.CounterOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "remote_alertmanager_configuration_sync_failures_total",
+			Help:      "Total number of failed attempts to sync configurations between Alertmanagers.",
+		}),
+		LastConfigSync: promauto.With(r).NewGauge(prometheus.GaugeOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "remote_alertmanager_last_configuration_sync_timestamp_seconds",
+			Help:      "Timestamp of the last successful configuration sync to the remote Alertmanager in seconds.",
+		}),
+		StateSyncsTotal: promauto.With(r).NewCounter(prometheus.CounterOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "remote_alertmanager_state_syncs_total",
+			Help:      "Total number of state syncs to the remote Alertmanager.",
+		}),
+		StateSyncErrorsTotal: promauto.With(r).NewCounter(prometheus.CounterOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "remote_alertmanager_state_sync_failures_total",
+			Help:      "Total number of failed attempts to sync state between Alertmanagers.",
+		}),
+		LastStateSync: promauto.With(r).NewGauge(prometheus.GaugeOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "remote_alertmanager_last_state_sync_timestamp_seconds",
+			Help:      "Timestamp of the last successful state sync to the remote Alertmanager in seconds.",
+		}),
+	}
+}

pkg/services/ngalert/ngalert.go

@@ -185,6 +185,9 @@ func (ng *AlertNG) init() error {
 
 		case remoteSecondary:
 			ng.Log.Debug("Starting Grafana with remote secondary mode enabled")
+			m := ng.Metrics.GetRemoteAlertmanagerMetrics()
+			m.Info.WithLabelValues(metrics.ModeRemoteSecondary).Set(1)
+
 			// This function will be used by the MOA to create new Alertmanagers.
 			override := notifier.WithAlertmanagerOverride(func(factoryFn notifier.OrgAlertmanagerFactory) notifier.OrgAlertmanagerFactory {
 				return func(ctx context.Context, orgID int64) (notifier.Alertmanager, error) {
@@ -195,7 +198,7 @@ func (ng *AlertNG) init() error {
 					}
 
 					// Create remote Alertmanager.
-					remoteAM, err := createRemoteAlertmanager(orgID, ng.Cfg.UnifiedAlerting.RemoteAlertmanager, ng.KVStore)
+					remoteAM, err := createRemoteAlertmanager(orgID, ng.Cfg.UnifiedAlerting.RemoteAlertmanager, ng.KVStore, m)
 					if err != nil {
 						moaLogger.Error("Failed to create remote Alertmanager, falling back to using only the internal one", "err", err)
 						return internalAM, nil
@@ -540,7 +543,7 @@ func ApplyStateHistoryFeatureToggles(cfg *setting.UnifiedAlertingStateHistorySet
 	}
 }
 
-func createRemoteAlertmanager(orgID int64, amCfg setting.RemoteAlertmanagerSettings, kvstore kvstore.KVStore) (*remote.Alertmanager, error) {
+func createRemoteAlertmanager(orgID int64, amCfg setting.RemoteAlertmanagerSettings, kvstore kvstore.KVStore, m *metrics.RemoteAlertmanager) (*remote.Alertmanager, error) {
 	externalAMCfg := remote.AlertmanagerConfig{
 		OrgID:             orgID,
 		URL:               amCfg.URL,
@@ -549,5 +552,5 @@ func createRemoteAlertmanager(orgID int64, amCfg setting.RemoteAlertmanagerSetti
 	}
 	// We won't be handling files on disk, we can pass an empty string as workingDirPath.
 	stateStore := notifier.NewFileStore(orgID, kvstore, "")
-	return remote.NewAlertmanager(externalAMCfg, stateStore)
+	return remote.NewAlertmanager(externalAMCfg, stateStore, m)
 }

pkg/services/ngalert/notifier/multiorg_alertmanager_remote_test.go

@@ -64,7 +64,8 @@ func TestMultiorgAlertmanager_RemoteSecondaryMode(t *testing.T) {
 			}
 			// We won't be handling files on disk, we can pass an empty string as workingDirPath.
 			stateStore := notifier.NewFileStore(orgID, kvStore, "")
-			remoteAM, err := remote.NewAlertmanager(externalAMCfg, stateStore)
+			m := metrics.NewRemoteAlertmanagerMetrics(prometheus.NewRegistry())
+			remoteAM, err := remote.NewAlertmanager(externalAMCfg, stateStore, m)
 			require.NoError(t, err)
 
 			// Use both Alertmanager implementations in the forked Alertmanager.

pkg/services/ngalert/remote/alertmanager.go

@@ -10,6 +10,7 @@ import (
 	"github.com/go-openapi/strfmt"
 	"github.com/grafana/grafana/pkg/infra/log"
 	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/ngalert/models"
 	"github.com/grafana/grafana/pkg/services/ngalert/notifier"
 	remoteClient "github.com/grafana/grafana/pkg/services/ngalert/remote/client"
@@ -26,6 +27,7 @@ type stateStore interface {
 
 type Alertmanager struct {
 	log      log.Logger
+	metrics  *metrics.RemoteAlertmanager
 	orgID    int64
 	ready    bool
 	sender   *sender.ExternalAlertmanager
@@ -59,7 +61,7 @@ func (cfg *AlertmanagerConfig) Validate() error {
 	return nil
 }
 
-func NewAlertmanager(cfg AlertmanagerConfig, store stateStore) (*Alertmanager, error) {
+func NewAlertmanager(cfg AlertmanagerConfig, store stateStore, metrics *metrics.RemoteAlertmanager) (*Alertmanager, error) {
 	if err := cfg.Validate(); err != nil {
 		return nil, err
 	}
@@ -76,7 +78,7 @@ func NewAlertmanager(cfg AlertmanagerConfig, store stateStore) (*Alertmanager, e
 		Password: cfg.BasicAuthPassword,
 		Logger:   logger,
 	}
-	mc, err := remoteClient.New(mcCfg)
+	mc, err := remoteClient.New(mcCfg, metrics)
 	if err != nil {
 		return nil, err
 	}
@@ -87,7 +89,7 @@ func NewAlertmanager(cfg AlertmanagerConfig, store stateStore) (*Alertmanager, e
 		Password: cfg.BasicAuthPassword,
 		Logger:   logger,
 	}
-	amc, err := remoteClient.NewAlertmanager(amcCfg)
+	amc, err := remoteClient.NewAlertmanager(amcCfg, metrics)
 	if err != nil {
 		return nil, err
 	}
@@ -104,13 +106,17 @@ func NewAlertmanager(cfg AlertmanagerConfig, store stateStore) (*Alertmanager, e
 		return nil, err
 	}
 
+	// Initialize LastReadinessCheck so it's present even if the check fails.
+	metrics.LastReadinessCheck.Set(0)
+
 	return &Alertmanager{
+		amClient:    amc,
 		log:         logger,
+		metrics:     metrics,
 		mimirClient: mc,
+		orgID:       cfg.OrgID,
 		state:       store,
-		amClient:    amc,
 		sender:      s,
-		orgID:       cfg.OrgID,
 		tenantID:    cfg.TenantID,
 		url:         cfg.URL,
 	}, nil
@@ -159,6 +165,7 @@ func (am *Alertmanager) checkReadiness(ctx context.Context) error {
 
 	if ready {
 		am.log.Debug("Alertmanager readiness check successful")
+		am.metrics.LastReadinessCheck.SetToCurrentTime()
 		am.ready = true
 		return nil
 	}
@@ -170,6 +177,7 @@ func (am *Alertmanager) checkReadiness(ctx context.Context) error {
 // If not, it sends the configuration to the remote Alertmanager.
 func (am *Alertmanager) CompareAndSendConfiguration(ctx context.Context, config *models.AlertConfiguration) error {
 	if am.shouldSendConfig(ctx, config) {
+		am.metrics.ConfigSyncsTotal.Inc()
 		if err := am.mimirClient.CreateGrafanaAlertmanagerConfig(
 			ctx,
 			config.AlertmanagerConfiguration,
@@ -178,8 +186,10 @@ func (am *Alertmanager) CompareAndSendConfiguration(ctx context.Context, config
 			config.CreatedAt,
 			config.Default,
 		); err != nil {
+			am.metrics.ConfigSyncErrorsTotal.Inc()
 			return err
 		}
+		am.metrics.LastConfigSync.SetToCurrentTime()
 	}
 	return nil
 }
@@ -193,9 +203,12 @@ func (am *Alertmanager) CompareAndSendState(ctx context.Context) error {
 	}
 
 	if am.shouldSendState(ctx, state) {
+		am.metrics.StateSyncsTotal.Inc()
 		if err := am.mimirClient.CreateGrafanaAlertmanagerState(ctx, state); err != nil {
+			am.metrics.ConfigSyncErrorsTotal.Inc()
 			return err
 		}
+		am.metrics.LastStateSync.SetToCurrentTime()
 	}
 	return nil
 }

pkg/services/ngalert/remote/alertmanager_test.go

@@ -14,12 +14,14 @@ import (
 
 	"github.com/go-openapi/strfmt"
 	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"
 	"github.com/grafana/grafana/pkg/services/ngalert/tests/fakes"
 	"github.com/grafana/grafana/pkg/util"
 	amv2 "github.com/prometheus/alertmanager/api/v2/models"
 	"github.com/prometheus/alertmanager/cluster/clusterpb"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/stretchr/testify/require"
 )
 
@@ -68,7 +70,8 @@ func TestNewAlertmanager(t *testing.T) {
 				TenantID:          test.tenantID,
 				BasicAuthPassword: test.password,
 			}
-			am, err := NewAlertmanager(cfg, nil)
+			m := metrics.NewRemoteAlertmanagerMetrics(prometheus.NewRegistry())
+			am, err := NewAlertmanager(cfg, nil, m)
 			if test.expErr != "" {
 				require.EqualError(tt, err, test.expErr)
 				return
@@ -106,7 +109,8 @@ func TestApplyConfig(t *testing.T) {
 	require.NoError(t, store.Set(ctx, cfg.OrgID, "alertmanager", notifier.SilencesFilename, "test"))
 	require.NoError(t, store.Set(ctx, cfg.OrgID, "alertmanager", notifier.NotificationLogFilename, "test"))
 
-	am, err := NewAlertmanager(cfg, fstore)
+	m := metrics.NewRemoteAlertmanagerMetrics(prometheus.NewRegistry())
+	am, err := NewAlertmanager(cfg, fstore, m)
 	require.NoError(t, err)
 
 	config := &ngmodels.AlertConfiguration{}
@@ -175,7 +179,8 @@ func TestIntegrationRemoteAlertmanagerApplyConfigOnlyUploadsOnce(t *testing.T) {
 	require.NoError(t, err)
 	encodedFullState := base64.StdEncoding.EncodeToString(fullState)
 
-	am, err := NewAlertmanager(cfg, fstore)
+	m := metrics.NewRemoteAlertmanagerMetrics(prometheus.NewRegistry())
+	am, err := NewAlertmanager(cfg, fstore, m)
 	require.NoError(t, err)
 
 	// We should have no configuration or state at first.
@@ -259,7 +264,8 @@ func TestIntegrationRemoteAlertmanagerSilences(t *testing.T) {
 		TenantID:          tenantID,
 		BasicAuthPassword: password,
 	}
-	am, err := NewAlertmanager(cfg, nil)
+	m := metrics.NewRemoteAlertmanagerMetrics(prometheus.NewRegistry())
+	am, err := NewAlertmanager(cfg, nil, m)
 	require.NoError(t, err)
 
 	// We should have no silences at first.
@@ -339,7 +345,8 @@ func TestIntegrationRemoteAlertmanagerAlerts(t *testing.T) {
 		TenantID:          tenantID,
 		BasicAuthPassword: password,
 	}
-	am, err := NewAlertmanager(cfg, nil)
+	m := metrics.NewRemoteAlertmanagerMetrics(prometheus.NewRegistry())
+	am, err := NewAlertmanager(cfg, nil, m)
 	require.NoError(t, err)
 
 	// Wait until the Alertmanager is ready to send alerts.
@@ -405,7 +412,8 @@ func TestIntegrationRemoteAlertmanagerReceivers(t *testing.T) {
 		BasicAuthPassword: password,
 	}
 
-	am, err := NewAlertmanager(cfg, nil)
+	m := metrics.NewRemoteAlertmanagerMetrics(prometheus.NewRegistry())
+	am, err := NewAlertmanager(cfg, nil, m)
 	require.NoError(t, err)
 
 	// We should start with the default config.

pkg/services/ngalert/remote/client/alertmanager.go

@@ -9,6 +9,8 @@ import (
 
 	httptransport "github.com/go-openapi/runtime/client"
 	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/services/ngalert/client"
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	amclient "github.com/prometheus/alertmanager/api/v2/client"
 )
 
@@ -24,12 +26,12 @@ type AlertmanagerConfig struct {
 
 type Alertmanager struct {
 	*amclient.AlertmanagerAPI
-	httpClient *http.Client
+	httpClient client.Requester
 	url        *url.URL
 	logger     log.Logger
 }
 
-func NewAlertmanager(cfg *AlertmanagerConfig) (*Alertmanager, error) {
+func NewAlertmanager(cfg *AlertmanagerConfig, metrics *metrics.RemoteAlertmanager) (*Alertmanager, error) {
 	// First, add the authentication middleware.
 	c := &http.Client{Transport: &MimirAuthRoundTripper{
 		TenantID: cfg.TenantID,
@@ -37,23 +39,27 @@ func NewAlertmanager(cfg *AlertmanagerConfig) (*Alertmanager, error) {
 		Next:     http.DefaultTransport,
 	}}
 
+	tc := client.NewTimedClient(c, metrics.RequestLatency)
 	apiEndpoint := *cfg.URL
 
 	// Next, make sure you set the right path.
 	u := apiEndpoint.JoinPath(alertmanagerAPIMountPath, amclient.DefaultBasePath)
-	transport := httptransport.NewWithClient(u.Host, u.Path, []string{u.Scheme}, c)
+
+	// Create an Alertmanager client using the timed client as the transport.
+	r := httptransport.New(u.Host, u.Path, []string{u.Scheme})
+	r.Transport = tc
 
 	return &Alertmanager{
 		logger:          cfg.Logger,
 		url:             cfg.URL,
-		AlertmanagerAPI: amclient.New(transport, nil),
-		httpClient:      c,
+		AlertmanagerAPI: amclient.New(r, nil),
+		httpClient:      tc,
 	}, nil
 }
 
-// GetAuthedClient returns a *http.Client that includes a configured MimirAuthRoundTripper.
+// GetAuthedClient returns a client.Requester that includes a configured MimirAuthRoundTripper.
 // Requests using this client are fully authenticated.
-func (am *Alertmanager) GetAuthedClient() *http.Client {
+func (am *Alertmanager) GetAuthedClient() client.Requester {
 	return am.httpClient
 }
 

pkg/services/ngalert/remote/client/mimir.go

@@ -12,6 +12,8 @@ import (
 	"strings"
 
 	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/services/ngalert/client"
+	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 )
 
 // MimirClient contains all the methods to query the migration critical endpoints of Mimir instance, it's an interface to allow multiple implementations.
@@ -26,9 +28,10 @@ type MimirClient interface {
 }
 
 type Mimir struct {
+	client   client.Requester
 	endpoint *url.URL
-	client   http.Client
 	logger   log.Logger
+	metrics  *metrics.RemoteAlertmanager
 }
 
 type Config struct {
@@ -60,21 +63,22 @@ func (e *errorResponse) Error() string {
 	return e.Error2
 }
 
-func New(cfg *Config) (*Mimir, error) {
+func New(cfg *Config, metrics *metrics.RemoteAlertmanager) (*Mimir, error) {
 	rt := &MimirAuthRoundTripper{
 		TenantID: cfg.TenantID,
 		Password: cfg.Password,
 		Next:     http.DefaultTransport,
 	}
 
-	c := http.Client{
+	c := &http.Client{
 		Transport: rt,
 	}
 
 	return &Mimir{
 		endpoint: cfg.URL,
-		client:   c,
+		client:   client.NewTimedClient(c, metrics.RequestLatency),
 		logger:   cfg.Logger,
+		metrics:  metrics,
 	}, nil
 }
 

pkg/services/ngalert/state/historian/loki.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/grafana/grafana/pkg/components/simplejson"
 	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/services/ngalert/client"
 	"github.com/grafana/grafana/pkg/services/ngalert/eval"
 	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	"github.com/grafana/grafana/pkg/services/ngalert/models"
@@ -54,7 +55,7 @@ type RemoteLokiBackend struct {
 	log            log.Logger
 }
 
-func NewRemoteLokiBackend(cfg LokiConfig, req Requester, metrics *metrics.Historian) *RemoteLokiBackend {
+func NewRemoteLokiBackend(cfg LokiConfig, req client.Requester, metrics *metrics.Historian) *RemoteLokiBackend {
 	logger := log.New("ngalert.state.historian", "backend", "loki")
 	return &RemoteLokiBackend{
 		client:         NewLokiClient(cfg, req, metrics, logger),

pkg/services/ngalert/state/historian/loki_http.go

@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/services/ngalert/client"
 	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	"github.com/grafana/grafana/pkg/setting"
 )
@@ -19,7 +20,7 @@ import (
 const defaultPageSize = 1000
 const maximumPageSize = 5000
 
-func NewRequester() Requester {
+func NewRequester() client.Requester {
 	return &http.Client{}
 }
 
@@ -79,7 +80,7 @@ func NewLokiConfig(cfg setting.UnifiedAlertingStateHistorySettings) (LokiConfig,
 }
 
 type HttpLokiClient struct {
-	client  Requester
+	client  client.Requester
 	encoder encoder
 	cfg     LokiConfig
 	metrics *metrics.Historian
@@ -100,8 +101,8 @@ const (
 	NeqRegEx Operator = "!~"
 )
 
-func NewLokiClient(cfg LokiConfig, req Requester, metrics *metrics.Historian, logger log.Logger) *HttpLokiClient {
-	tc := NewTimedClient(req, metrics.WriteDuration)
+func NewLokiClient(cfg LokiConfig, req client.Requester, metrics *metrics.Historian, logger log.Logger) *HttpLokiClient {
+	tc := client.NewTimedClient(req, metrics.WriteDuration)
 	return &HttpLokiClient{
 		client:  tc,
 		encoder: cfg.Encoder,

pkg/services/ngalert/state/historian/loki_http_test.go

@@ -11,6 +11,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/grafana/grafana/pkg/services/ngalert/client"
 	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	"github.com/grafana/grafana/pkg/setting"
 	"github.com/prometheus/client_golang/prometheus"
@@ -337,7 +338,7 @@ func TestStream(t *testing.T) {
 	})
 }
 
-func createTestLokiClient(req Requester) *HttpLokiClient {
+func createTestLokiClient(req client.Requester) *HttpLokiClient {
 	url, _ := url.Parse("http://some.url")
 	cfg := LokiConfig{
 		WritePathURL: url,

pkg/services/ngalert/state/historian/loki_test.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/grafana/grafana-plugin-sdk-go/data"
 	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/services/ngalert/client"
 	"github.com/grafana/grafana/pkg/services/ngalert/eval"
 	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
 	"github.com/grafana/grafana/pkg/services/ngalert/models"
@@ -503,7 +504,7 @@ grafana_alerting_state_history_writes_total{backend="loki",org="1"} 2
 	})
 }
 
-func createTestLokiBackend(req Requester, met *metrics.Historian) *RemoteLokiBackend {
+func createTestLokiBackend(req client.Requester, met *metrics.Historian) *RemoteLokiBackend {
 	url, _ := url.Parse("http://some.url")
 	cfg := LokiConfig{
 		WritePathURL:   url,