Change Redis cluster discovery to use CLUSTER_SHARDS API
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area/redis
enhancement
help wanted
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Description
*Title*: Change Redis cluster discovery to use CLUSTER_SHARDS API
*Description*:
Currently Envoy uses [CLUSTER_SLOTS](https://redis.io/docs/latest/commands/cluster-slots/) to fetch cluster topology from Redis. CLUSTER_SLOTS is deprecated in Redis 7.0. It is slower and less efficient than the new API, [CLUSTER_SHARDS](https://redis.io/docs/latest/commands/cluster-shards/). We observed CLUSTER_SHARDS payload size to be 10x smaller than the CLUSTER_SLOTS payload for big redis cluster with 12k shards.
[Redis doc](https://redis.io/docs/latest/commands/cluster-slots/) also recommends using CLUSTER_SHARDS over CLUSTER_SLOTS
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