Merge pull request #44167 from soundcloud/mr/restore-updating-endpoints-log-message

Automatic merge from submit-queue

Restore "Setting endpoints" log message

**What this PR does / why we need it**:

The "Setting endpoints" message from kube-proxy at high verbosity was
lost as part of a larger simplification in kubernetes/kubernetes#42747.

This change brings it back, simply outputting the just-constructed
addresses list.

I need this message to monitor delays in propagating endpoints changes across nodes.

**Release note**:

```release-note
NONE
```

pkg/proxy/iptables/proxier.go

@@ -662,6 +662,13 @@ func accumulateEndpointsMap(endpoints *api.Endpoints, hostname string,
 				}
 				(*newEndpoints)[svcPort] = append((*newEndpoints)[svcPort], epInfo)
 			}
+			if glog.V(3) {
+				newEPList := []string{}
+				for _, ep := range (*newEndpoints)[svcPort] {
+					newEPList = append(newEPList, ep.endpoint)
+				}
+				glog.Infof("Setting endpoints for %q to %+v", svcPort, newEPList)
+			}
 		}
 	}
 }