Change log-level for better performance and less annoying logs (#1231)

This PR removes not so useful logs and changes most of Info level
log to Debug/Error level in hot path while preserving some of them
that is helpful for troubleshooting.

pkg/executor/poolmgr/gp.go

@@ -234,14 +234,14 @@ func (gp *GenericPool) _choosePod(newLabels map[string]string) (*apiv1.Pod, erro
 			// modified, this should fail; in that case just
 			// retry.
 			chosenPod.ObjectMeta.Labels = newLabels
-			gp.logger.Info("relabeling pod", zap.String("pod", chosenPod.ObjectMeta.Name))
 			_, err = gp.kubernetesClient.CoreV1().Pods(gp.namespace).Update(chosenPod)
 			if err != nil {
 				gp.logger.Error("failed to relabel pod", zap.Error(err), zap.String("pod", chosenPod.ObjectMeta.Name))
 				continue
 			}
 		}
-		gp.logger.Info("chose pod", zap.String("pod", chosenPod.ObjectMeta.Name), zap.Duration("elapsed_time", time.Since(startTime)))
+		gp.logger.Info("chose pod", zap.Any("labels", newLabels),
+			zap.String("pod", chosenPod.ObjectMeta.Name), zap.Duration("elapsed_time", time.Since(startTime)))
 		return chosenPod, nil
 	}
 }
@@ -587,10 +587,16 @@ func (gp *GenericPool) GetFuncSvc(ctx context.Context, m *metav1.ObjectMeta) (*f
 		svc := utils.GetFunctionIstioServiceName(m.Name, m.Namespace)
 		svcHost = fmt.Sprintf("%v.%v:8888", svc, gp.namespace)
 	} else {
-		gp.logger.Info("using pod IP for specialized pod", zap.String("pod", pod.ObjectMeta.Name), zap.String("function", m.Name))
 		svcHost = fmt.Sprintf("%v:8888", pod.Status.PodIP)
 	}
 
+	gp.logger.Info("specialized pod",
+		zap.String("pod", pod.ObjectMeta.Name),
+		zap.String("podNamespace", pod.ObjectMeta.Namespace),
+		zap.String("function", m.Name),
+		zap.String("functionNamespace", m.Namespace),
+		zap.String("specialization_host", svcHost))
+
 	kubeObjRefs := []apiv1.ObjectReference{
 		{
 			Kind:            "pod",