testName: "envoy metrics keepalive nil",
			key:      "envoy_metrics_service_tcp_keepalive",
			option:   option.EnvoyMetricsServiceTCPKeepalive(nil),
			expected: nil,
		},
		{
			testName: "envoy metrics keepalive",
			key:      "envoy_metrics_service_tcp_keepalive",
			option: option.EnvoyMetricsServiceTCPKeepalive(&networkingAPI.ConnectionPoolSettings_TCPSettings_TcpKeepalive{
				Time: durationpb.New(time.Second),
			}),

		opts = append(opts, option.EnvoyMetricsServiceAddress(config.EnvoyMetricsService.Address),
			option.EnvoyMetricsServiceTLS(config.EnvoyMetricsService.TlsSettings, metadata),
			option.EnvoyMetricsServiceTCPKeepalive(config.EnvoyMetricsService.TcpKeepalive))
	} else if config.EnvoyMetricsServiceAddress != "" { // nolint: staticcheck
		opts = append(opts, option.EnvoyMetricsServiceAddress(config.EnvoyMetricsService.Address))
	}