Improve client networking backoff / retry#2480

Merged

dpkp merged 9 commits intomasterfrom

dpkp/refresh-metadata-backoff

Feb 14, 2025

Commits on Feb 14, 2025

conn: no connection delays between dns entries; merge blacked_out w/ connection_delay
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conn: next_ifr_request_timeout_ms() returns delay until next req timeout
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Drop poll timeout reset when no in flight requests
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Do not mark conn as sending if future immediately resolves (error)
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client poll: do not set 100ms timeout for unfinished futures
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Improve metadata refresh backoff/retry -- respect connection delays
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conn: honor reconnect backoff in connection_delay when connecting
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Log connection delay for not-ready nodes in producer sender loop
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Increase default reconnect_backoff_max_ms to 30000 (30 secs)
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