If you are using gRPCLB 
<https://github.com/grpc/grpc/blob/618a3f561d4a93f263cca23abad086ed8f4d5e86/doc/load-balancing.md>,
 
please read on:

gRPC team is working on evolving the current gRPCLB functionality. We will 
be moving away from our custom load balancing protocol and adopting xDS 
Protocol 
<https://github.com/envoyproxy/data-plane-api/blob/master/XDS_PROTOCOL.md> 
based on Envoy xDS API 
<https://github.com/envoyproxy/data-plane-api/blob/master/API_OVERVIEW.md>. 
This will allow interoperability with open source control planes that 
support the xDS API, such as Istio Pilot 
<https://istio.io/docs/concepts/traffic-management/>, go-control-plane 
<https://github.com/envoyproxy/go-control-plane> and java-control-plane 
<https://github.com/envoyproxy/java-control-plane>. Other improvements 
include a more flexible and improved load balancing policy configuration 
<https://github.com/grpc/proposal/blob/master/A24-lb-policy-config.md> and 
load reporting based on LRS 
<https://github.com/envoyproxy/envoy/blob/master/api/envoy/service/load_stats/v2/lrs.proto>
 
(load reporting service).

The client-side implementation of xDS load balancing plugin will not be 
compatible with the current gRPCLB protocol. Hence, the current gRPCLB 
implementation can be considered deprecated. We are actively working on the 
implementation of the new protocol. Expect to see a lot of progress in the 
coming quarters, including a gRFC on the new design. If you are relying on 
the current implementation in any way, please comment here so we can figure 
out an appropriate time to remove it after the new implementation is ready.

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