metaproxier logging for endpoints ipfamily

The kube-proxy metaproxier implementations tries to get the IPFamily
from the endpoints, but if the endpoints doesn't contains an IP
address it logs a Warning.

This causes that services without endpoints keep flooding the logs
with warnings.

We log this errors with a level of Verbosity of 4 instead of a Warning

Author: aojea

pkg/proxy/metaproxier/BUILD

@@ -1,6 +1,6 @@
 package(default_visibility = ["//visibility:public"])
 
-load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
     name = "go_default_library",
@@ -28,3 +28,10 @@ filegroup(
     srcs = [":package-srcs"],
     tags = ["automanaged"],
 )
+
+go_test(
+    name = "go_default_test",
+    srcs = ["meta_proxier_test.go"],
+    embed = [":go_default_library"],
+    deps = ["//staging/src/k8s.io/api/core/v1:go_default_library"],
+)

pkg/proxy/metaproxier/meta_proxier.go

@@ -103,7 +103,7 @@ func (proxier *metaProxier) OnServiceSynced() {
 func (proxier *metaProxier) OnEndpointsAdd(endpoints *v1.Endpoints) {
 	ipFamily, err := endpointsIPFamily(endpoints)
 	if err != nil {
-		klog.Warningf("failed to add endpoints %s/%s with error %v", endpoints.ObjectMeta.Namespace, endpoints.ObjectMeta.Name, err)
+		klog.V(4).Infof("failed to add endpoints %s/%s with error %v", endpoints.ObjectMeta.Namespace, endpoints.ObjectMeta.Name, err)
 		return
 	}
 	if *ipFamily == v1.IPv4Protocol {
@@ -118,7 +118,7 @@ func (proxier *metaProxier) OnEndpointsAdd(endpoints *v1.Endpoints) {
 func (proxier *metaProxier) OnEndpointsUpdate(oldEndpoints, endpoints *v1.Endpoints) {
 	ipFamily, err := endpointsIPFamily(endpoints)
 	if err != nil {
-		klog.Warningf("failed to update endpoints %s/%s with error %v", endpoints.ObjectMeta.Namespace, endpoints.ObjectMeta.Name, err)
+		klog.V(4).Infof("failed to update endpoints %s/%s with error %v", endpoints.ObjectMeta.Namespace, endpoints.ObjectMeta.Name, err)
 		return
 	}
 
@@ -134,7 +134,7 @@ func (proxier *metaProxier) OnEndpointsUpdate(oldEndpoints, endpoints *v1.Endpoi
 func (proxier *metaProxier) OnEndpointsDelete(endpoints *v1.Endpoints) {
 	ipFamily, err := endpointsIPFamily(endpoints)
 	if err != nil {
-		klog.Warningf("failed to delete endpoints %s/%s with error %v", endpoints.ObjectMeta.Namespace, endpoints.ObjectMeta.Name, err)
+		klog.V(4).Infof("failed to delete endpoints %s/%s with error %v", endpoints.ObjectMeta.Namespace, endpoints.ObjectMeta.Name, err)
 		return
 	}