xds: Surround two Infof calls that use pretty.ToJSON with V(2) checks (#7216)

Author: townba

xds/internal/balancer/clusterimpl/clusterimpl.go

@@ -211,7 +211,9 @@ func (b *clusterImplBalancer) UpdateClientConnState(s balancer.ClientConnState)
 		return nil
 	}
 
-	b.logger.Infof("Received update from resolver, balancer config: %+v", pretty.ToJSON(s.BalancerConfig))
+	if b.logger.V(2) {
+		b.logger.Infof("Received update from resolver, balancer config: %s", pretty.ToJSON(s.BalancerConfig))
+	}
 	newConfig, ok := s.BalancerConfig.(*LBConfig)
 	if !ok {
 		return fmt.Errorf("unexpected balancer config with type: %T", s.BalancerConfig)

xds/internal/balancer/clusterresolver/clusterresolver.go

@@ -242,7 +242,9 @@ func (b *clusterResolverBalancer) updateChildConfig() {
 		b.logger.Warningf("Failed to parse child policy config. This should never happen because the config was generated: %v", err)
 		return
 	}
-	b.logger.Infof("Built child policy config: %v", pretty.ToJSON(childCfg))
+	if b.logger.V(2) {
+		b.logger.Infof("Built child policy config: %s", pretty.ToJSON(childCfg))
+	}
 
 	endpoints := make([]resolver.Endpoint, len(addrs))
 	for i, a := range addrs {