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Update cluster docs with a note on zookeeper session timeouts
Zookeeper client does session tracking and validation (pings) on separate threads. This could make sessions timeouts likely during high CPU utilization. With multi threaded backups, we have seen consistent session timeouts during backup of a cluster with 1 billion files, which causes the leader to change and backup to be interrupted.( See #9023 for details) This PR adds a note to related doc section. pr-link: #9088 change-id: cid-4935b8b8910f263edf9cc0bbf69f10577b0d76bf
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