Alerting: prevent the use of the same uid across all contact points (#51440)

* Alerting: prevent the use of the same uid across all contact points

* Update pkg/services/ngalert/provisioning/contactpoints.go

Co-authored-by: Yuriy Tseretyan <yuriy.tseretyan@grafana.com>

Co-authored-by: Yuriy Tseretyan <yuriy.tseretyan@grafana.com>

pkg/services/ngalert/provisioning/contactpoints.go

@@ -146,6 +146,15 @@ func (ecp *ContactPointService) CreateContactPoint(ctx context.Context, orgID in
 
 	receiverFound := false
 	for _, receiver := range revision.cfg.AlertmanagerConfig.Receivers {
+		// check if uid is already used in receiver
+		for _, rec := range receiver.PostableGrafanaReceivers.GrafanaManagedReceivers {
+			if grafanaReceiver.UID == rec.UID {
+				return apimodels.EmbeddedContactPoint{}, fmt.Errorf(
+					"receiver configuration with UID '%s' already exist in contact point '%s'. Please use unique identifiers for receivers across all contact points",
+					rec.UID,
+					rec.Name)
+			}
+		}
 		if receiver.Name == contactPoint.Name {
 			receiver.PostableGrafanaReceivers.GrafanaManagedReceivers = append(receiver.PostableGrafanaReceivers.GrafanaManagedReceivers, grafanaReceiver)
 			receiverFound = true

pkg/services/ngalert/provisioning/contactpoints_test.go

@@ -58,6 +58,19 @@ func TestContactPointService(t *testing.T) {
 		require.Equal(t, customUID, cps[1].UID)
 	})
 
+	t.Run("it's not possbile to use the same uid twice", func(t *testing.T) {
+		customUID := "1337"
+		sut := createContactPointServiceSut(secretsService)
+		newCp := createTestContactPoint()
+		newCp.UID = customUID
+
+		_, err := sut.CreateContactPoint(context.Background(), 1, newCp, models.ProvenanceAPI)
+		require.NoError(t, err)
+
+		_, err = sut.CreateContactPoint(context.Background(), 1, newCp, models.ProvenanceAPI)
+		require.Error(t, err)
+	})
+
 	t.Run("create rejects contact points that fail validation", func(t *testing.T) {
 		sut := createContactPointServiceSut(secretsService)
 		newCp := createTestContactPoint()