* [fluentd-gcp addon] Bump fluentd-gcp-scaler to v0.5.1 to pick up security fixes.
    * [fluentd-gcp addon] Bump event-exporter to v0.2.4 to pick up security fixes.
    * [fluentd-gcp addon] Bump prometheus-to-sd to v0.5.0 to pick up security fixes.
    * [metatada-proxy addon] Bump prometheus-to-sd v0.5.0 to pick up security fixes.

    * [fluentd-gcp addon] Bump fluentd-gcp-scaler to v0.5.1 to pick up security fixes.
    * [fluentd-gcp addon] Bump event-exporter to v0.2.4 to pick up security fixes.
    * [fluentd-gcp addon] Bump prometheus-to-sd to v0.5.0 to pick up security fixes.
    * [metatada-proxy addon] Bump prometheus-to-sd v0.5.0 to pick up security fixes.

  `sync_proxy_rules_iptables_restore_failures_total` metric may be more useful. ([#81517](https://github.com/kubernetes/kubernetes/pull/81517), [@danwinship](https://github.com/danwinship))
### Instrumentation
- Bump version of event-exporter to 0.3.1, to switch it to protobuf. ([#83396](https://github.com/kubernetes/kubernetes/pull/83396), [@loburm](https://github.com/loburm))
- Bumps metrics-server version to v0.3.6 with following bugfix:

### Internal Storage Layer

* The behavior of the default handler for 404 requests fro the GCE Ingress load balancer is slightly modified in the sense that it now exports metrics using prometheus. The metrics exported include:  ([#79106](https://github.com/kubernetes/kubernetes/pull/79106), [@vbannai](https://github.com/vbannai))
    * - http_404_request_total  (the number of 404 requests handled)

porter.png...

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	sig := m.Type().(*types.Signature)
	recv := sig.Recv().Type()
	// report exported methods with unexported receiver base type
	if true {
		base := recv
		if p, _ := recv.(*types.Pointer); p != nil {
			base = p.Elem()
		}
		if obj := base.(*types.Named).Obj(); !obj.Exported() {
			log.Fatalf("exported method with unexported receiver base type: %s", m)
		}
	}
	tps := ""

    }

    @Test
    public void test_buildFilePath_noPath() {
        final Path result = indexExportJob.buildFilePath("/export", "https://example.com", new HtmlIndexExportFormatter());
        assertEquals(Path.of("/export/example.com/index.html"), result);
    }

    @Test
    public void test_buildFilePath_noExtension() {

		// Valid inputs.
		{":9000", []string{"/export1"}, true},
		{":9000", []string{"/export1", "/export2", "/export3", "/export4"}, true},
		{":9000", []string{"/export1{1...64}"}, true},
		{":9000", []string{"/export1{01...64}"}, true},
		{":9000", []string{"/export1{1...32}", "/export1{33...64}"}, true},
		{":9001", []string{"http://localhost:9001/export{1...64}"}, true},