go func() {
		if err := proxy.downstreamGrpcServer.Serve(proxy.downstreamListener); err != nil {
			log.Errorf("failed to accept downstream gRPC connection %v", err)
		}
	}()

	go proxy.healthChecker.PerformApplicationHealthCheck(func(healthEvent *health.ProbeEvent) {
		// Store the same response as Delta and SotW. Depending on how Envoy connects we will use one or the other.
		req := &discovery.DiscoveryRequest{TypeUrl: model.HealthInfoType}