Better control on xDS deduplication based on protobuf
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api/v3
design proposal
help wanted
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Description
From discussion in https://github.com/envoyproxy/envoy/pull/8231#discussion_r324191998
Key take aways:
- Prefer using version_info instead comparing new xDS delivered config with existing one, this also solves https://github.com/envoyproxy/envoy/issues/7676
- Add a UUID in ConfigSource for deduplication, instead of hashing `ConfigSource` proto to automatically dedup. This means RDS/SDS ConfigSource sent from LDS should be deduplicated at control plane.
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