A new series of enhancements for handling locality load balancing in proxyless mesh deployments is now available in GA

## Feature A new series of enhancements for handling locality load balancing in proxyless mesh deployments is now available in GA. These enhancements let you do the following: * Create and use a list of preferred load-balancing policies. With this feature, if your first preferred policy can't be used by a particular client, gRPC falls back to the next policy on the list. * Use a custom load-balancing policy that you created and deployed with gRPC. As part of a related gRPC enhancement, a new set of APIs lets you capture metrics about query cost and server utilization. You can use these APIs to fine-tune your custom policy. For more information about using these features, see [Locality load balancing](https://cloud.google.com/traffic-director/docs/proxyless-configure-advanced-traffic-management#custom-lb-config). **Caution:** This feature is intended for use in a service mesh that includes gRPC clients only. Envoy proxies can't use backend services that have this configuration.