Alerting: Update remote alertmanager to use extended receivers API. (#89253)

* Alerting: Update remote alertmanager to use extended receivers API.

* Update integration test and Mimir image

* Update Mimir image in more places

pkg/services/ngalert/remote/alertmanager.go

@@ -15,7 +15,6 @@ import (
 	amalert "github.com/prometheus/alertmanager/api/v2/client/alert"
 	amalertgroup "github.com/prometheus/alertmanager/api/v2/client/alertgroup"
 	amgeneral "github.com/prometheus/alertmanager/api/v2/client/general"
-	amreceiver "github.com/prometheus/alertmanager/api/v2/client/receiver"
 	amsilence "github.com/prometheus/alertmanager/api/v2/client/silence"
 	"github.com/prometheus/client_golang/prometheus"
 
@@ -487,21 +486,7 @@ func (am *Alertmanager) GetStatus(ctx context.Context) (apimodels.GettableStatus
 }
 
 func (am *Alertmanager) GetReceivers(ctx context.Context) ([]apimodels.Receiver, error) {
-	params := amreceiver.NewGetReceiversParamsWithContext(ctx)
-	res, err := am.amClient.Receiver.GetReceivers(params)
-	if err != nil {
-		return []apimodels.Receiver{}, err
-	}
-
-	rcvs := make([]apimodels.Receiver, len(res.Payload))
-	for i, rcv := range res.Payload {
-		rcvs[i] = apimodels.Receiver{
-			Name:         *rcv.Name,
-			Integrations: []apimodels.Integration{},
-		}
-	}
-
-	return rcvs, nil
+	return am.mimirClient.GetReceivers(ctx)
 }
 
 func (am *Alertmanager) TestReceivers(ctx context.Context, c apimodels.TestReceiversConfigBodyParams) (*notifier.TestReceiversResult, error) {

pkg/services/ngalert/remote/alertmanager_test.go

@@ -717,7 +717,13 @@ func TestIntegrationRemoteAlertmanagerReceivers(t *testing.T) {
 	// We should start with the default config.
 	rcvs, err := am.GetReceivers(context.Background())
 	require.NoError(t, err)
-	require.Equal(t, "empty-receiver", rcvs[0].Name)
+	require.Equal(t, []apimodels.Receiver{
+		{
+			Active:       true,
+			Name:         "empty-receiver",
+			Integrations: []apimodels.Integration{},
+		},
+	}, rcvs)
 }
 
 func genAlert(active bool, labels map[string]string) amv2.PostableAlert {

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

@@ -11,7 +11,8 @@ import (
 )
 
 const (
-	grafanaAlertmanagerConfigPath = "/api/v1/grafana/config"
+	grafanaAlertmanagerConfigPath    = "/api/v1/grafana/config"
+	grafanaAlertmanagerReceiversPath = "/api/v1/grafana/receivers"
 )
 
 type UserGrafanaConfig struct {
@@ -63,3 +64,16 @@ func (mc *Mimir) CreateGrafanaAlertmanagerConfig(ctx context.Context, cfg *apimo
 func (mc *Mimir) DeleteGrafanaAlertmanagerConfig(ctx context.Context) error {
 	return mc.doOK(ctx, grafanaAlertmanagerConfigPath, http.MethodDelete, nil)
 }
+
+func (mc *Mimir) GetReceivers(ctx context.Context) ([]apimodels.Receiver, error) {
+	response := []apimodels.Receiver{}
+
+	// nolint:bodyclose
+	// closed within `do`
+	_, err := mc.do(ctx, grafanaAlertmanagerReceiversPath, http.MethodGet, nil, &response)
+	if err != nil {
+		return nil, err
+	}
+
+	return response, nil
+}

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

@@ -29,6 +29,9 @@ type MimirClient interface {
 	DeleteGrafanaAlertmanagerConfig(ctx context.Context) error
 
 	ShouldPromoteConfig() bool
+
+	// Mimir implements an extended version of the receivers API under a different path.
+	GetReceivers(ctx context.Context) ([]apimodels.Receiver, error)
 }
 
 type Mimir struct {