Add api-gateway to allow list for gateway-kind annotation

control-plane/connect-inject/controllers/endpoints/endpoints_controller.go

@@ -43,6 +43,7 @@ const (
 	meshGateway        = "mesh-gateway"
 	terminatingGateway = "terminating-gateway"
 	ingressGateway     = "ingress-gateway"
+	apiGateway         = "api-gateway"
 
 	envoyPrometheusBindAddr              = "envoy_prometheus_bind_addr"
 	envoyTelemetryCollectorBindSocketDir = "envoy_telemetry_collector_bind_socket_dir"
@@ -801,9 +802,11 @@ func (r *Controller) createGatewayRegistrations(pod corev1.Pod, serviceEndpoints
 				"address": "0.0.0.0",
 			},
 		}
-
+	case apiGateway:
+		// Do nothing. This is only here so that API gateway pods have annotations
+		// consistent with other gateway types but don't return an error below.
 	default:
-		return nil, fmt.Errorf("%s must be one of %s, %s, or %s", constants.AnnotationGatewayKind, meshGateway, terminatingGateway, ingressGateway)
+		return nil, fmt.Errorf("%s must be one of %s, %s, %s, or %s", constants.AnnotationGatewayKind, meshGateway, terminatingGateway, ingressGateway, apiGateway)
 	}
 
 	if r.MetricsConfig.DefaultEnableMetrics && r.MetricsConfig.EnableGatewayMetrics {