[feat] PIP-468: Namespace scalable-topics watcher (protocol + broker + V5 client)#25648

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merlimat merged 6 commits intoapache:masterfrom

merlimat:st-scalable-topics-watcher

May 1, 2026

Commits on May 1, 2026

[feat][broker] PIP-468: Namespace scalable-topics watcher protocol + broker session
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[feat][client] PIP-468: V5 client-side namespace scalable-topics watcher
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[feat] PIP-468: Hash-based snapshot skip on watcher reconnect
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Drop design doc from PR — content folded into PR description
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[fix] PIP-468: Drop consumer_name; switch update event to proto oneof
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[fix] PIP-468: Address review on watcher PR — listener leak, backoff reset
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